54 PROCEEDINGS OF THE ACADEMY OF [1879. 



hyoid, and stylo-pharyngeus muscles. Anteriorly I noticed the 

 sterno-hyoid, sterno-thyroid, and thyro-hyoid, and the little crico- 

 thyroid artery passing across the erico-thyroid membrane. 

 Laterally the omohyoid muscle was well developed. It was held 

 in position by the little band of the cervical fascia, and served, 

 with the sterno-cleido mastoid muscle, to divide the neck, topo- 

 graphical^ speaking, into the triangles. I noticed that the muscle 

 sometimes called the omo-cervicalis was well developed. This 

 muscle arises from the transverse process of the atlas, and is 

 inserted into the clavicle ; it was very properly described by Tyson 

 as the elevator of the clavicle. It has been found in Man as an 

 anomaly. Very human in its appearance was the disposition of 

 the phrenic nerve lying upon the scalenus anticus muscle, and 

 coming from the 3d and 4th cervicals. The muscle separated the 

 subclavian vein from the artery, and between it and the scalenus 

 medius the brachial plexus emerged. The whole cervical region 

 was strikingly human in its disposition, and with the exceptions 

 of the sterno-cleido mastoid muscle being divided into two, and in 

 the presence of an omo-cervicalis muscle, the neck of the Chim- 

 panzee would serve the surgical anatomist as material for a 

 demonstration quite as well as that of a human being. On raising 

 the clavicle the subclavius minor and coracoid ligament were 

 seen well developed; the pectoralis muscle, however, presented a 

 difference from that of Man, as it arose from the 2d and 3d ribs, 

 and was inserted into the head of the humerus. The axillary 

 region was very human in its appearance; the anterior and pos- 

 terior thoracic nerves and the intercosto-humeral were well de- 

 veloped. 



Upper Extremity. The brachial plexus surrounding the axillary 

 artery exhibited the outer, posterior, and inner cords, the outer 

 coming from the fifth, sixth, and seventh cervicals, the inner from 

 the eighth cervical and first dorsal ; the posterior cord from the 

 outer and inner ones. The plexus gave off, as in Man, the external 

 cutaneous, median, ulnar, internal cutaneous, and musculo-spiral. 

 I did not notice, however, the nerve of Wrisberg; the subscapular 

 and suprascapular nerves were found in their customaiy human 

 position. The disposition of the median, ulnar, and radial nerves 

 in the hand were the same as in Man. The latissimo-condyloideus 

 muscle was well developed, but I could see no difference in the 

 biceps, coraco-brachialis, brachialis anticus, and triceps as com- 



