Human Anatomy Vol 1

FOREARM AND HAND

Bronches

1 Muscular, to the flexor carpi ulnaris and the medial
half of the flexor digitorum profundus.
2 Palmar cutaneous branch arises in the middle of the
forearm and supplies the skin over the hypothenar
eminence (Fig.9.13a).
3 Dorsal cutaneous branch arises 7.5 cm above the
wrist, winds backwards and supplies the proximal
parts of the medial 2%fingers and the adjoining area
of the dorsum of the hand.
4 Articular branches are given off to the elbow joint.
5 Its branches in the palm are shown in Fig. 9.73b.

RADIAL NERVE

Course

The radial nerve divides into its two terminal branches

in the cubital fossa just below the level of the lateral

epicondyle of the humerus (Fig. 9.a).

Blonches

The deep terminalbranch (posterior interosseous) soon

enters the back of the forearm by passing through the

supinator muscle.

The superficial terminalbranch (the main continuation

of the nerve) runs dor,rrn in front of the forearm.

The superficial terminal branch of the radial nerve

is closely related to the radial artery only in the middle

one-third of the forearm (Fig. 9.10).

In the upper one-third, it is widely separated from

the artery, and in the lower one-third it passes

backwards under the tendon of the brachioradialis.

The superficial terminal branch is purely cutaneous

and is distributed to the lateral half of the dorsum of

the hand, and to the proximal parts of the dorsal

surfaces of the thumb, the index finger, and lateral half

of the middle finger.

Medial half of

flexor digitorum

profundus

Palmar

cutaneous

branch

Deep terminal

branch

Nerve passing

behind medial

intermuscular

septum

Nerve passing

behind medial

epicondyle

Flexor carpi

ulnaris

Dorsal cutaneous

branch

Flexor retinaculum

Superficial

terminal branch

Digital branches

Tendons of flexor digitorum profundus

Flexor digiti minimi

Ulnar nerve

Abductor digiti minlmi

Opponens digiti minimi

Fig. 9.13a: Course and branches of ulnar nerve

Injury to this branch results in small area of sensory

loss over the root of the thumb.

Branch to deep head of flexor pollicis brevis

Lumbricals

3rd 2nd

4th

3rd

2nd- 1 st

Dorsal interossei

Fig. 9.13b: Distribution of deep branch of ulnar nerve

Flexor pollicis brevis

Abductor pollicis brevis

Opponens pollicis

Adductor pollicis

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