. The comparative anatomy of the domesticated animals. Veterinary anatomy. THE BRACHIAL PLEXUS. 767 the Dog furnishes branches to all the digits, except the auricularis and external border of tlie annularis. In the Cat, the median traverses the bony canal at tlie lower extremity of the humerus, and separates below the carpal arch into three branches. The internal branch is destined to the rudimentary thumb, and the internal palmar border of the index. The middle brancli descends in the third interosseous space, furnishes a filament to the large cushion of the paw, and divides to form the exter
. The comparative anatomy of the domesticated animals. Veterinary anatomy. THE BRACHIAL PLEXUS. 767 the Dog furnishes branches to all the digits, except the auricularis and external border of tlie annularis. In the Cat, the median traverses the bony canal at tlie lower extremity of the humerus, and separates below the carpal arch into three branches. The internal branch is destined to the rudimentary thumb, and the internal palmar border of the index. The middle brancli descends in the third interosseous space, furnishes a filament to the large cushion of the paw, and divides to form the external palmar collaterals of the index and internal of the medius. Finally, the external branch is placed in the second intermetacarpal space, and gives the following pahuar coUaierals: the external of the medius and internal of the annularis. The ulnar nerve of the Bog. below the elbow, lies beside the ulnar artery to the lower third of that vessel; there it forms two branches—a dorsal and palmar. The dorsal branch becomes subcutaneous, passes along the external border of the fore-arm, metacarpus, and small digit, and con- stitutes the external dorsal collateral nerve of the latter. The palmar branch leaves the carpal sheath, gives off, at the trapezoides, a ramus- cule that passes to the surface of the palmar muscles to form the external collateral pal- mar of the auricularis, and then, at the surface of the deep palmar arch, divides into eight terminal ramuscules. The smallest of the^e is expended in the ru'limentary muscles of tlie thumb, the small digit, and interosseous muscles; the largest, three in number, lie on the interosseous arteries, and bifurcate at the digits to form the palmar collaterals; the two internal ramuscules are previously confounded with the correspond- ing branches of the median. From this arrangement, it results that the ulnar nerve supplies the palmar surface of all the digits, except the internal border of the index. The idnar of the Cat also divid
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