| OCR Text |
Show 1869.] THE MYOLOGY OF MENOPOMA. 265 from the lateral muscular mass just at the lateral longitudinal groove, and is inserted on the inner side of the upper part of the scapula. The levator anguli scapulee (fig. 5, L. A. S) is the antagonist of the muscle last described. It is very long and slender, and arises from the hinder and inferior margin of the exoccipital, and is inserted into the upper part of the inner side of the scapula. The omohyoid has been already described as the last but one of the muscles of the head. The subclavius* (figs. 2, 3, 5, & 6, S.) arises from the outer surface of the precoracoid (of Parker) and, passing backwards beside the coraco-brachialis, and more or less connected with the latter, is inserted into the summit of the great tuberosity. Coraco-brachialis (fig. 2, C. B). This muscle is large, and consists of two parts. The first of these springs from the whole surface of the coracoid, and is partly covered up by the pectoralis; it is inserted into the inner side of the radial tuberosity of the humerus. The second part, thick and long, arises from the posterior margin of the coracoid, close behind the glenoid cavity; passing down into the bend of the elbow-joint, it is inserted into the shaft of the humerus down to the internal condyle. Deltoid (figs. 3, 5, & 6, D). A muscle which may perhaps answer to the deltoid of higher forms springs from the outside of the scapula, and passing down is inserted into the outer side of the radial tuberosity, near its summit. Subscapularis. A very small triangular muscle, springing from the inner side of the scapula close to the glenoid surface, and implanted into the humerus. It passes between the two heads of the triceps, which spring from the scapular arch. Biceps (figs. 2 & 3, B). This muscle, which appears to answer both to the biceps and brachialis anticus of higher animals, consists perhaps of two parts, though one is with difficulty separable from the long coraco-brachialis. This latter portion springs from the posterior margin of the coracoid, close to the glenoid surface ; and a strong tendon runs along it. The other part arises from the front of the shaft of the humerus, immediately below the insertions of the pectoralis and subclavius. The muscle is partly inserted into the shaft of the radius, and in part fuses with the supinator longus. Triceps (figs. 2 & 3, T). This is a large muscle arising partly, by a considerable head, from the junction of the scapula and coracoid just in front of the glenoid surface, by another and much smaller head from the inner surface of the coracoid, just behind the glenoid surface. It also takes origin from the inner and outer surfaces of the humerus near its summit, and it receives an accession by the union of the latissimus dorsi. It is implanted into the proximal end of the ulna. Supinator longus (figs. 2, 2A, 3, & 4, S. L). A thick muscle which may be thus named springs from the radial side of the lower * Prof. Rolleston has shown, I think conclusively, that m y epicoraco-humeral is really the subclavius; and the muscle here described in Menopoma may probably be the same as m y epicoracodiumeral. |
