OCR Text |
Show 1867.] MYOLOGY OF IGUANA TUBERCULATA. 775 The dorsal mass or supracaudal muscle is in part the continuation backwards of the sacro-lumbalis, in part takes fresh origin from the posterior surface of the ilium. It extends backwards also to about the thirteenth caudal vertebra. Fig. 6. Superficial muscles of front of thorax, of inside of right arm, and of flexor surface of right forearm. B. Biceps. B. A. Brachialis anticus. 0. B. 2. Second or long part of coracobrachialis. D. 1. First part of deltoid. E. 0. External oblique. E. U. Extensor carpi ulnaris. F. P. D. 1. First part of flexor profundus digitorum. F. P.B.2. Second part of flexor profundus digitorum. F.S. Flexor carpi radialis. F. S. D. Flexor sublimis digitorum. P. Pectoralis. P. T. Pronator teres. S. Rectus abdominis. S. C. M. Sterno-cleido-mastoid. S. L. Supinator longus. T. 4. Fourth part of the triceps. MUSCLES OF THE PECTORAL LIMB. Pectoralis major (figs. 1, 2, 6, 8 & 10, P.). This muscle is largely developed, and arises from the sternal part of the sixth thoracic rib, and from the sternum aud interclavicle, from the posterior end of the former to the anterior extremity of the latter. From this extensive origin its fibres converge, and are inserted into the most prominent part of the radial tuberosity of the humerus, just opposite the insertion of the deltoid, but separated from the |