Human Anatomy Vol 1

Fig. 9.36: Flattening of medial border of forearm

Fig- 9.37: Distal interphalangeal joints of ring and little fingers
remain extended

Fig. 9.38: Little finger remains extended at terminal phalanx

FOREARM AND HAND

space of the carpal tunnel in front of the ulnar bursa

enclosing the flexor tendons.

Immediately below the retinaculum the nerve

divides into lateral and medial divisions (Fig. 9.20).

The lateral division gives off a muscular branch to

the thenar muscles, and three digital branches for

the lateral one and half digits including the thumb.

The muscular branch curls upwards round the

distal border of the retinaculum and supplies the

thenar muscles.

Out of the three digital branches, two supply the

thumb and one the lateral side of the index finger.

The digital branch to the index finger also supplies

the first lumbrical (Fig.9.aD.

The medial division divides into two common digital

branches for the second and third interdigital clefts,

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