Volume 1
On the anatomy, physiology, and pathology of the chimpanzee / by Charles F. Sonntag.
- Sonntag, Charles F. (Charles Frederick), -1925
- Date:
- 1923
Licence: In copyright
Credit: On the anatomy, physiology, and pathology of the chimpanzee / by Charles F. Sonntag. Source: Wellcome Collection.
89/118 page 409
![The musculo-cutaneous nerve from C 5, C 6, 0 7, gives a branch to ttie coraco-brachialis and then pierces the muscle. It then gives a large branch to the biceps. Finally it divides into a muscular trunk to the brachialis anticus, and a cutaneous trunk, which gives a small nerve to the spina tor longus. Four subsccipular nerves are present. The two upper ones go to the upper and lower parts of subscapularis. The long sub- scapular communicates with the musculo-spiral nerve and supplies the latissimus dorsi. The lowest nerve supplies the subscapularis and teres major. The median nerve arises from the anterior divisions of all the nerves forming the plexus. It almost immediately after its formation gives a small branch to the coraco-brachialis. No branches arise in the arm. Just below the bend of the elbow it supplies the flexor carpi radialis, flexor sublimis, and both heads of the pronatqy radii teres. Then it communicates with the ulnar nerve by a thick branch. In the middle of the forearm it supplies the radial fibres of the flexor sublimis digitorum. About an inch distal to the radio-carpal joint it bifurcates. The outer division supplies the thenar muscles, first lumbrical, and the skin of the radial side of the index and ulnar side of the thumb. The inner division gives a small twig to the third and fourth lum- bricals. Then it divides to supply adjacent sides of the second and third and fourth digits. The nerve to the second and third digits also supplies the second lumbrical. All the branches pass deep to the superficial palmar arch. The circumflex nerve gives the nerve to the teres minor before it passes through the quadrilateral space. No definite anterior and posterior divisions are present. After giving off the large lateral cutaneous nerve of the arm it breaks up into deltoid branches. The ulnar nerve arises in common with the median. Its course is much as in Man. In the forearm it supplies the flexor carpi ulnaris and flexor profundus digitorum and communicates with the median nerve. Two inches proximal to the wrist it divides into anterior and posterior divisions. The former supplies the hypothenar muscles, the skin of the adjacent sides of the annu- laris and minimus and the inner side of the minimus; and the latter goes deeply to supply the palmar interossei. A dorsal branch leaves the main trunk at the level of the pisiform bone and supplies interossei. The musculospiral nerve from the posterior divisions of C 6, C 7, C 8, gives off a slender, but long, nerve to the dorso-epitroclile iris. Its course is as in Man. In the arm it gives off branches to the triceps and skin as in Man. In the lower part of the arm it supplies the supinator longus and extensor carpi radialis longior. At the bend of the elbow it divides into radial and posterior interosseous nerves. The former runs down to the skin of the wrist. The latter perforates the supinator brevis. It supplies the extensores carpi radialis longior and brevior, and the muscles [87]](https://iiif.wellcomecollection.org/image/b2982123x_0001_0089.jp2/full/800%2C/0/default.jpg)
