Flexor radialis. Muscles (Flexor carpi radialis)

The flexor carpi ulnaris is located on the medial edge of the forearm. Key features: thick tendon, long belly.

general information

Musculus flexor carpi ulnaris (as this tendon is called in anatomy in Latin) consists of two heads:

Shoulder - located in the area of the intermuscular, epicondyle of the shoulder.

Ulnar - begins already at the process of the elbow, occupies about two-thirds from the bottom, covering the forearm in the area of fascia. The tissue is placed near the flexor retinaculum and provides coverage of the pisiform bone. Next, the tissue gradually passes into the pisiometacarpal and uncinate ligaments. The head is attached to the metacarpal and hamate bones.

The main function of the tendon is flexion/extension of the hand.

How to pump it up?

The flexor carpi ulnaris muscle can be pumped up at home without the use of exercise equipment or equipment. Yoga comes to the rescue. The exercise is as follows:

Clench your fists;

Extend your arms forward;

Hands up;

Lower your arms, straining your hands.

Aim to touch your forearm with your fists.

It is believed that the flexor carpi ulnaris can be pumped up with acupressure. Reflexotherapy recommends making it a daily procedure, as it strengthens the hands and helps maintain muscle tone. In this case, they act on an area called the anatomical snuffbox, that is, a depression that is located at the very base of the palm between two small bones. It is recommended to do acupressure massage 2-3 times a day.

Push-ups and training with dumbbells have a positive effect on the flexor carpi ulnaris tendon. Remember that even with a heavy load there will not be an immediate result; the effect will be noticeable after a month or two of regular practice.

Gives good results fitness equipment and implements invented to train the flexor carpi radialis and ulnaris. The most famous of them is the expander. When purchasing, give preference to round products with a small hole in the center. It is better to take a small projectile of medium hardness. Maximum loads are recommended after 6-8 months from the start of training. The combined use of two types of expanders is effective:

Soft (warm-up);

Hard (training).

Spring expanders equipped with a stiffness adjustment system are suitable for professional use.

You can develop your flexor carpi ulnaris with this exercise in any convenient place, at any time of the day. With minimal rigidity, start with 8-10 repetitions, then take a break and start the next set. In the first days, two cycles will be enough; over time, the duration of the training will increase. You should not exercise for more than 15 minutes a day.

Please note that execution difficult exercises leads to painful sensations. If you overdo it with gymnastics and resistance band training, use topical pain-relieving ointments.

Why does the tendon hurt?

If your flexor carpi planus is painful, it's probably tendonitis. The term is applied to a wide range of diseases associated with degeneration of tendon tissue. If an organ undergoes chronic stress beyond normal, edema develops and microscopic cracks appear, leading to destruction of the mucous membrane. If the process is not recognized in time and treatment is not taken up, the mucous membrane degenerates, and the tendon acquires the consistency of jelly.

The flexor carpi radialis and ulnaris most often suffer from lateral epicondylitis, popularly called. This disease is characterized by severe pain in the area of the epicondyle of the shoulder, which is diagnosed by palpation. The damage is classified as stressful and develops against the background of chronic fatigue of the tendon. As the name suggests, a similar pathology develops in tennis players. Epicondylitis affects players of badminton, golf and other similar sports.

Features of rehabilitation

During rehabilitation, the condition of the tendon is monitored as follows:

Supination (rotation) of the hand on the table surface;

Stabilization of the dorsal side;

Bend the wrist with the fingers down.

The test allows you to visually determine the condition of the tendon, since it clearly protrudes on the surface of the forearm. Please note that training involves stress on the tendon, so use this technique carefully.

Rehabilitation of the tendon is based on the innervation of the ulnar nerve. The tendon mobility test is performed in the ulnar direction, which is the most active. In this case, one hand fixes the forearm, and the other resists the hypothenar. On inside The doctor palpates the tendon and monitors the degree of recovery.

Attachment Blood supply Innervation

n. medianus (C VI -C VII)

Function

flexes and pronates the hand

Antagonist Physical examination

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Catalogs

Flexor radialis wrists(lat. Musculus flexor carpi radialis ) - flat long lasting muscle. Located lateral to all flexors of the forearm. In the proximal part, it is covered only by the aponeurosis of the biceps brachii and palmaris longus, and the rest, most of the muscle, is covered only by fascia and skin. The muscle originates from the medial epicondyle of the humerus, intermuscular septum and fascia of the forearm. It goes down and passes under the flexor retinaculum to the base of the palmar surface of the II (III) metacarpal bone.

Function

It flexes the hand and can also retract it to the radial side in combination with other muscles.

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Muscles of the shoulder girdle

Shoulder muscles

Front group

Back group

Forearm muscles

Front group

Back group

Lateral group

Muscles of the hand

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Muscles of the eminence of the thumb

Muscles of the eminence of the little finger

Middle group muscles

TO forearm muscles We will include the muscles that form the relief of this area of the limb and perform the functions of flexion-extension of the arm at the elbow and wrist joints, rotation of the forearm, as well as flexion-extension of the fingers. These muscles begin at the distal end humerus or the proximal ends of the bones of the forearm; they end on the bones of the wrist, metacarpus and phalanges of the fingers.

Traditionally, these muscles are divided into two groups - posterior and anterior; each of which contains several layers.

Front group:

first layer

brachioradialis muscle
flexor carpi radialis
flexor carpi ulnaris
palmaris longus muscle
pronator teres

second layer

flexor digitorum superficialis

third layer

flexor digitorum profundus
flexor pollicis longus

fourth layer

pronator quadratus

Back group:

surface layer

extensor carpi radialis longus
extensor carpi radialis brevis
extensor carpi ulnaris
extensor digitorum
extensor digitorum

deep layer

arch support
extensor index finger
extensor longus thumb
extensor pollicis brevis
abductor longus muscle thumb brushes

Further, in accordance with the general scheme muscular system vertebrates, these muscles are considered, depending on their position in the process of onto- and phylogenesis, as dorsal And ventral, corresponding extensors And flexors; Moreover, the ventral muscles are more developed than the dorsal ones.

Dorsal muscles

Dorsal muscles of the human forearm

More details o Dorsal muscles of the human forearm

Extensor carpi radialis longus (musculus extensor carpi radialis longus)

Begins on the lateral epicondyle of the humerus and the lateral intermuscular septum of the shoulder, touching the lateral surface of the capsule of the elbow joint; is attached, passing along the entire forearm from the side radius, to the base of the second metacarpal bone; the terminal tendon passes under extensor retinaculum(retinaculum extensorum), under which all other extensors also pass. By contracting, the muscle extends the hand and participates in flexion of the forearm; together with the flexor carpi radialis, it abducts the hand to the lateral side. The activity of the muscle is regulated by the radial nerve; the muscle is supplied with blood radial artery , recurrent radial artery, collateral radial artery.

Extensor carpi radialis brevis (musculus extensor carpi radialis brevis)

It also begins on the lateral epicondyle of the humerus and is attached to the base of the third metacarpal bone. Contracting, the hand extends; together with the flexor carpi radialis, it abducts the hand to the lateral side. Innervated by the radial nerve, it receives blood through return beam And .

Extensor carpi ulnaris (musculus extensor carpi ulnaris)

It begins on the lateral epicondyle of the humerus and the capsule of the elbow joint, from where it stretches along the ulna and attaches to the base of the fifth metacarpal bone; the terminal tendon passes in a separate synovial sheath. By contracting, the muscle extends the hand; together with the flexor carpi ulnaris, it brings the hand to the medial side. Innervated by the radial nerve, it receives blood from posterior interosseous artery.

Extensor digitorum (musculus extensor digitorum)

It begins on the lateral epicondyle of the humerus and runs along the dorsal side of the forearm between the extensor radialis and extensor ulnaris; having reached the wrist joint, it is divided into four tendons, passing in a single synovial sheath and attached to the back of the II-V fingers; in this case, the middle tendon bundles are attached to the base of the middle phalanx, and the lateral ones - to the distal one. Above the metacarpal bones, these four tendons are connected to each other by fibrous bundles - the so-called intertendinous joints(connexeus intertendineus). The function of the muscle is to extend the II-V fingers, as well as participate in the extension of the entire hand at the wrist joint. Innervated by the radial nerve, it receives blood from posterior interosseous artery.

Extensor of the little finger (musculus extensor digiti V)

It begins with the extensor digitorum on the lateral epicondyle of the humerus; its terminal tendon passes in a separate synovial sheath and is attached by various bundles to the bases of the middle and distal phalanges of the fifth finger (little finger).

Brachioradialis muscle (musculus brachioradialis)

Begins on the lateral epicondylar ridge of the humerus; its abdomen goes around the ulnar fossa laterally, and at the level of the middle of the forearm it passes into a narrow flat tendon, attached to the lateral surface of the distal end of the radius. By contracting, the muscle flexes the forearm in elbow joint, rotates the radius, and also places the hand in a position intermediate between pronation and supination. The muscle is innervated by the radial nerve, and receives blood through the radial nerve. return beam And collateral radial arteries.

Supinator (musculus supinator)

It begins on the lateral epicondyle of the humerus, the crest of the supinator of the ulna and the annular ligament of the radius, from where it passes obliquely to the lateral side and attaches to the lateral surface of the radius. By contracting, the muscle ensures supination of the radius and hand (turns outward). The muscle is innervated by the radial nerve, and receives blood through the radial, interosseous and recurrent arteries.

Extensor index finger (musculus extensor indicus)

Begins on the dorsal surface of the ulna; The terminal tendon passes through the common sheath along with the extensor digitorum and is attached to the proximal phalanx of the index finger. By contracting, the muscle extends the index finger. Innervated by the radial nerve, it receives blood from posterior interosseous artery.

Extensor pollicis longus (musculus extensor pollicis longus)

Begins on the lateral side of the dorsal surface of the ulna; The terminal tendon passes in a separate synovial sheath under the extensor retinaculum and is attached to the base of the distal phalanx of the thumb. By contracting, the muscle extends the thumb. Innervated by the radial nerve, supplied with blood along the radial and posterior interosseous artery.

Extensor pollicis brevis (musculus extensor pollicis brevis)

Begins on the dorsal surface of the radius; The terminal tendon passes under the extensor retinaculum and is attached to the base of the proximal phalanx of the thumb. By contracting, the muscle extends and abducts the thumb. Innervated by the radial nerve, supplied with blood by posterior interosseous And radial arteries.

Abductor pollicis longus (musculus abductor pollicis longus)

It begins on the dorsal surface of the radius and stretches obliquely, downward and laterally, bending around the outside of the radius; the terminal tendon passes under the extensor retinaculum in the same sheath as the previous muscle, after which it is attached to the base of the first metacarpal bone. By contracting, the muscle abducts the thumb and participates in the abduction of the entire hand. Innervated by the radial nerve, it receives blood along the posterior interosseous artery and radial artery.

Ventral muscles

Ventral muscles human forearm

More details o Ventral muscles of the human forearm

Pronator teres (musculus pronator teres)

It begins on the medial epicondyle of the humerus, the medial intermuscular septum, and also on the coronoid process of the ulna. Limiting the olecranon fossa medially, the muscle stretches along the forearm and attaches to the middle of the lateral surface of the radius. When contracting, the muscle pronates the forearm and hand (turns it inward), and also participates in flexing the arm at the elbow joint. Muscle activity is regulated by median nerve, blood flows to the muscle through the brachialis, ulnaris, radial arteries.

Flexor carpi radialis (musculus flexor carpi radialis)

It begins on the medial condyle of the humerus, from where it extends along the radius; the terminal tendon passes under flexor retinaculum(retinaculum flexorum), common to this muscle and all other flexors, after which it is attached to the base of the second metacarpal bone. Contracting, it flexes the wrist, and together with the extensor carpi radialis, it moves the hand laterally. Innervated median nerve, blood receives through the brachial, radial and ulnar arteries.

Palmaris longus (musculus palmaris longus)

It begins on the medial epicondyle of the shoulder, the terminal tendon, stretching from the middle of the forearm, passes under the flexor retinaculum and is woven into the palmar aponeurosis. The function of the muscle is to stretch the specified aponeurosis and flex the hand. Innervated median nerve, blood receives through the radial artery.

Flexor carpi ulnaris (musculus flexor carpi ulnaris)

It begins with two heads - the humeral and ulnar. humeral head(caput brachiale) begins on the medial epicondyle of the humerus; ulnar head(caput ulnare) - on the medial edge of the olecranon and the posterior edge of the ulna. In the proximal third of the forearm, the heads unite, after which the muscle stretches along the ulna and passes into a tendon, individual bundles of which are attached to the pisiform bone, the hook of the hamate bone and to the base of the fifth metacarpal bone. By contracting, the muscle flexes the wrist, and together with the extensor carpi ulnaris muscle, medially adducts the hand. Innervated by the ulnar nerve, it receives blood from ulnar artery, as well as the top and inferior collateral ulnar arteries.

Superficial flexor of the fingers (musculus flexor digitorum superficialis)

It begins with two heads - the humeroulnar and radial, connected to each other by tendon stretching. Humeral ulnar head(caput humeroulnare) begins on the medial epicondyle of the shoulder, fascia of the forearm and on the medial edge of the coronoid process; smaller in size radial holoka(caput radiale) - on the proximal part of the radius. In the proximal part of the forearm, the heads are connected into an abdomen lying in the middle of the ventral side of the forearm, which is further divided into four tendons that pass under the flexor retinaculum and the palmar aponeurosis, after which they are attached to the bases of the middle phalanges of the II-V fingers. By contracting, the muscle bends the fingers and also participates in the flexion of the hand. Its activities are regulated by median nerve, the muscle is supplied with blood along the ulnar and radial arteries.

Flexor digitorum profundus (musculus flexor digitorum profundus)

Begins on the proximal portions of the ulna; four of its tendons pass together with the corresponding tendons of the superficial flexor, after which they are attached to the bases of the distal phalanges of the II-V fingers. By contracting, the muscle bends the fingers and also participates in the flexion of the hand. The muscle is innervated along the elbow and median nerve, is supplied with blood along the radial and ulnar arteries

Flexor pollicis longus (musculus flexor pollicis longus)

Begins on the surface of the radius from the level of the tuberosity of the radius to the upper edge of the pronator quadratus; The terminal tendon passes through the wrist in a separate sheath before attaching to the base of the distal phalanx of the thumb. By contracting, the muscle flexes the thumb and participates in flexion of the hand. Innervated median nerve, the blood gets anterior interosseous artery.

Pronator quadratus

It has a shape corresponding to its name, located deeper than other muscles between the ulna and radius bones, starting from the distal third of the ulna and attaching to the distal third of the radius. When contracting, the muscle pronates the forearm and hand and is innervated median nerve, the blood gets anterior interosseous artery.

68. ROUND PRONATOR BEGINS

On the medial epicondyle of the shoulder

2) on the lateral epicondyle of the shoulder

3) on the olecranon

4) on the block of the humerus

69. POINT OF ATTACHMENT OF THE SUPERFICIAL FLEXOR OF THE FINGERS

1) proximal phalanx of 2-5 fingers

2) distal phalanx of 2-5 fingers

Middle phalanx 2-5 fingers

4) 2-5 metacarpal bones

70. IN THE THIRD LAYER OF MUSCLES ON THE FRONT SURFACE OF THE FOREARM IS LOCATED

Flexor digitorum profundus

3) pronator quadratus

4) flexor carpi radialis

71. IN THE SECOND LAYER OF MUSCLES ON THE FRONT SURFACE OF THE FOREARM IS LOCATED

2) flexor carpi radialis

Flexor digitorum superficialis

4) flexor pollicis longus

72. THE POINT OF ATTACHMENT OF THE EXTENSOR THUMB BREFUS IS

1) 1st metacarpal bone

Base of the proximal phalanx of the thumb

3) distal phalanx of the thumb

4) head of the proximal phalanx of the thumb

73. THE MUSCLES OF THE EMERGENCY OF THE THUMB RELATE TO

1) palmaris brevis muscle

Brushes

3) first dorsal interosseous muscle

Adductor pollicis muscle

74. THE MUSCLES OF THE EMERGENCY OF THE LITTLE FINGER REFERENCES

1) palmaris longus muscle

2) supinator muscle

Abductor digiti minimi muscle

4) extensor digitorum

75. FUNCTION OF THE VERMIFORM MUSCLES OF THE HAND

1) extension of the proximal phalanges

Flexion of the proximal phalanges

3) adduction of fingers II, IV, V

4) flexion of the middle phalanges

76. IN THE FIRST CHANNEL THE WRISTS ARE LOCATED

Tendon longus muscle abductor thumb

2) tendon of the long extensor carpi radialis

3) tendon of the extensor pollicis longus

4) tendon of the short extensor carpi radialis

77. THE INTERNAL GROUP OF MUSCLES OF THE PELVIC RELATES

1) big gluteal muscle

3) sartorius

Iliopsoas muscle

78. ILIOPSOUMAS MUSCLE ATTACHED

1) to the patella

2) to the greater trochanter

To the lesser trochanter

4) to the intertrochanteric ridge

79. ATTACHMENT POINT OF THE GLUTEUS MAJOR MUSCLE

1) lesser trochanter

2) greater skewer

3) gluteal tuberosity

4) intertrochanteric ridge

80. THE MUSCLES OF THE FEMOR OF THE ANTERIOR GROUP REFERENCES

1) quadriceps

2) pectineus muscle

Quadratus muscle hips

81. THE MUSCLES OF THE POSTERIOR THIGH REFERENCES

1) gluteus maximus muscle

Biceps femoris

3) sartorius muscle

4) thin muscle

82. THE DEEP LAYER OF THE POSTERIOR GROUP OF THE MUSCLES OF THE LIN FORM

1) extensor digitorum longus

2) long peroneus muscle

3) plantaris muscle

Rear tibialis muscle

83. THE MUSCLES OF THE MEDIAL GROUP ON THE PLANT REFERENCES

Flexor pollicis brevis

2) short extensor pollicis

3) plantaris muscle

4) tibialis posterior muscle

84. THE MIDDLE GROUP OF MUSCLES OF THE PLANTAR SURFACE OF THE FOOT INCLUDES

1) muscle that abducts the little toe

2) short extensor pollicis

Flexor digitorum brevis

4) extensor digitorum brevis

85. THE MUSCLES OF THE DORS OF THE FOOT REFERENCES

1) peroneus brevis muscle

2) plantar interosseous muscles

3) abductor pollicis muscle

Extensor brevis thumb

86. FEMOR TRIANGLE LIMITED

Inguinal ligament

2) pectineal ligament

3) pectineus muscle

4) ilium

87. LOCATION OF THE MUSCLE LACUNE

1) greater sciatic foramen

2) lesser sciatic foramen

Behind the inguinal ligament

4) medial to the iliopectineal arch

88. PASSES THROUGH THE MUSCULAR GAP

1) piriformis muscle

Iliopsoas muscle

3) pectineus muscle

4) femoral artery

89. PASSES THROUGH THE GREATER SCITICAL FORANA

2) obturator internus muscle

3) external obturator muscle

Piriformis muscle

90. PASSES THROUGH THE Lesser Ischiatic Foramen

1) iliopsoas muscle

Obturator internus muscle

3) piriformis muscle

4) external obturator muscle

91. THE WALLS OF THE FEMORAL CANAL FORM

1) pectineal ligament

2) transversalis fascia

Femoral vein

4) femoral nerve

92. SUPERFICIAL RING OF THE FEMORAL CANAL LIMITED

1) spermatic cord

2) iliopectineal arch

3) inguinal ligament

Crescent edge of the cribriform fascia

93. THE WALLS OF THE ADRIVING CHANNEL ARE FORMED

Adductor magnus muscle

2) adductor brevis muscle

3) pectineus muscle

4) adductor longus muscle

94. LIMITS THE POPELLETIUM FOSSA

1) quadriceps femoris muscle

Semimembranosus muscle

3) soleus muscle

4) peroneus brevis muscle

95. OPENING INTO THE POPPLITHEAL FOSSA

1) femoral canal

2) obturator canal

3) ankle-popliteal canal

4) superior musculofibular canal

96. CHANNEL CONNECTING WITH THE ANCIOLOPPLITHEAL CANAL

1) lower musculofibular canal

2) adductor channel

Superior musculofibular canal

4) femoral canal

97. PARTICIPATES IN THE FORMATION OF THE WALLS OF THE LOWER MUSCULEOFIBULAR CANAL

1) front surface fibula

2) flexor digitorum longus

Radial flexor carpi, so-called flexor carpi radialis. H: medial epicondyle of the humerus. P: base of the 2nd metacarpal bone. F: pronates, flexes and abducts the hand. Inn.: median nerve. Rice. A.
Long palmaris muscle, t. palmaris longus. H: medial epicondyle of the humerus. P: palmar aponeurosis. F: stretches the palmar aponeurosis; bends the hand at the wrist, and the 2nd - 5th fingers at the metacarpophalangeal joints. Inn.: median nerve Fig. A.
Flexor carpi ulnaris, so-called flexor carpi ulnaris. H: medial epicondyle of the humerus, olecranon process and posterior edge of the ulna. P: pisiform, hamate and 5th metacarpal bones (through the pisiform-hocate and pisiform-metacarpal ligaments. F: flexes and adducts the hands. Inn.: ulnar nerve. Fig. A. 4.
Humeral head, caput numberate. It starts from the epicondyle of the humerus.
Ulnar head, caput ulnare. Originates from the ulna. Rice. D.
Superficial flexor of the fingers, i.e. flexor digitorum superficialis. H: medial epicondyle of the humerus, coronoid process of the ulna and anterior surface of the radius. P: middle phalanges of the 2nd-5th fingers. F: bends the joints it crosses along its path. In the middle of the proximal phalanx, each tendon splits into two legs, between which passes the tendon of the deep flexor digitorum. Inn.: median nerve Fig. A, B.
Humeral ulnar head, caput humeroulnare. Starts from the humerus and ulna. Rice. A, D, E.
Radial head, caput radiale. Starts from the radius. Rice. A, D.
Flexor digitorum profundus. H: upper half of the ulna. P: Nail phalanges of 2-5 fingers. F: bends all joints it crosses along its path. Inn.: ulnar and median nerves. Rice. B, D, E.
Flexor pollicis longus. H: middle of the anterior surface of the radius and medial epicondyle of the humerus. P: distal phalanx of the thumb. F: bends the joints it crosses along its path. Inn.: median nerve. Rice. B, D.
Quadratus pronator, i.e. pronator qudratus. H: lower quarter of the anterior surface of the ulna. P: distal quarter of the anterior surface of the radius. F: pronates the forearm. Inn.: median nerve. Rice. A, B, D.
Brachioradialis muscle, t. brachioradialis. H: intermuscular septum and lateral edge of the humerus. R: styloid process of the radius. F: flexes the forearm and places it in a mid-position between pronation and supination. Inn.: radial nerve Rice. A, B, D.
Extensor carpi radialis longus, i.e. extensor carpi radialis longus. H: intermuscular septum and lateral epicondyle of the humerus. P: dorsal surface of the 2nd metacarpal bone. F: extends and abducts the hand, flexes the forearm. Inn.: radial nerve. Rice. A, V.
Extensor carpi radialis brevis, extensor carpi radialis brevis. H: lateral epicondyle of the humerus. P: proximal part of the dorsum of the 3rd metacarpal bone. F: extends and abducts the hand. Inn.: radial nerve. Rice. IN.
Extensor digitorum, i.e. extensor digitorum. H: lateral epicondyle of the humerus. P: through the dorsal aponeurosis to the distal phalanges of the 2nd-5th fingers. F: extends fingers and hand. Inn.: radial nerve. Rice. IN.
Intertendon joint, coxus intertendineus []. Located between the extensor tendons of the fingers on the bend of the hand. Rice. IN.
Extensor of the little finger, t. extensor digiti minimi. H: lateral epicondyle of the humerus. P: dorsal aponeurosis of the 5th finger. F: extends the little finger and hand. Inn.: radial nerve. Rice. IN.
Extensor carpi ulnaris, extensor carpi ulnaris. H: lateral epicondyle of the humerus and radial collateral ligament; back surface ulna. P: base of the fifth metacarpal bone. F: extends and adducts the hand. Inn.: radial nerve. Fig.B, G.
Humeral head, caput numberate. Originates from the humerus.
Ulnar head, caput ulnare. Starts from the ulna. Rice. E.
Supinator, t. supinator. H: lateral epicondyle of the humerus, radial collateral ligament, supinator crest. P: anterior surface of the radius. F: supinates the forearm. Inn.: radial nerve. Rice. B, G, D, E.
The abductor pollicis longus muscle, i.e. abductor pollicis longus. H: dorsum of the interosseous membrane and adjacent sections of the radius and ulna. P: base of the 1st metacarpal bone. F: abducts and extends the thumb, supinates the forearm. Inn.: radial nerve. Rice. B, G, E.
Extensor pollicis brevis, extensor pollicis brevis. H: dorsum of the radius and interosseous membrane. P: base of the proximal phalanx of the 1st finger. F: abducts and extends the finger at the metacarpophalangeal joint. Inn.: radial nera Fig. B, G, E.
Extensor pollicis longus, mextensor pollicis longus. H: interosseous membrane, dorsum of the ulna. P: distal phalanx gg of the thumb. F: adducts and extends the thumb; supinates the forearm. Inn.: radial nerve Fig. B, G, E.
Extensor of the index finger, i.e. extensor indicis. H: interosseous membrane, dorsum of the ulna. P: dorsal aponeurosis. F: extends the 2nd finger and hand. Inn.: radial nera Fig. G, E.
Short palmaris muscle, pi palmaris brevis. H: ulnar side of the palmar aponeurosis. P: skin of the ulnar side of the hand. Inn.: radial nerve Fig. A.