. The anatomy of the domestic animals . Veterinary anatomy. 816 NERVOUS SYSTEM OF THE HORSE Axillary Nerve The axillary nerve (Figs. 566, 652)^ derives its fibers chiefly from the eighth cervical root of the brachial plexus. It runs downward and backward across the distal part of the subscapularis, and, in company with the posterior circumflex artery, dips in between that muscle and the subscapular artery at the level of the shoulder joint. Continuing outward in the interval between the teres minor and the long and lateral heads of the triceps, it reaches the deep face of the deltoid and divid
. The anatomy of the domestic animals . Veterinary anatomy. 816 NERVOUS SYSTEM OF THE HORSE Axillary Nerve The axillary nerve (Figs. 566, 652)^ derives its fibers chiefly from the eighth cervical root of the brachial plexus. It runs downward and backward across the distal part of the subscapularis, and, in company with the posterior circumflex artery, dips in between that muscle and the subscapular artery at the level of the shoulder joint. Continuing outward in the interval between the teres minor and the long and lateral heads of the triceps, it reaches the deep face of the deltoid and divides into several divergent branches. The muscular branches supply the teres major, capsularis, teres minor, deltoid, and brachiocephali- cus. The cutaneous branch (N. cutaneus brachii lateralis) runs downward and a little forward across the lateral head of the triceps and ramifies on the fascia on the front of the forearm and on the superficial pectoral muscle. Radial Nerve The radial nerve^ (Figs. 566, 568, 652) is sometimes the largest branch of the brachial plexus. Its fibers are derived chiefly from the first thoracic root of the plexus. It passes do^vnward and backward over the medial surface of the origin of the subscapular artery and the distal part of the teres major. In this part of its course it is related in front to the ulnar nerve, which separates it from the brachial vein.^ It detaches a branch to the tensor fascise antibrachii, passes out- ward in the interval between the teres major and the long and medial heads of the triceps, and gains the musculo-spiral groove of the humerus. Accompanied by a branch of the deep brachial artery, it runs obliquely downward and outward in the groove, covered laterally by the lateral head of the tri- ceps and the extensor carpi radialis, and reaches the flexion surface of the elbow joint. In this part of its course it gives off muscular branches to the three heads of the triceps and to the anconeus, and a cutaneous nerve (N. cutan
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