OCR Text |
Show 1867.] MYOLOGY OF IGUANA TUBERCULATA. 769 Longissimus dorsi. This is small and very indistinctly separable from the sacro-lumbalis. It partly arises from the posterior end of the crest of the ilium ; partly it is the anterior continuation of the dorsal series of caudal muscular cones, or rather to the halves of those cones. Passing forwards it is inserted into, and takes fresh origin from, the spines and adjacent parts of the vertebrae. The sacro-lumbalis, though wide, is very thin, except at its posterior end, and it is very imperfectly separable from the last. It arises from the crest of the ilium, and appears to be partly continuous with the supracaudal muscular mass. It is inserted, in an indistinct manner (by tendinous intervals which become more marked from behind forwards), into the ribs, including the cervical ones, as it passes insensibly into the cervicalis ascendens. Complexus major (figs. 2 & 2A, C. Ma.). This is an elongated muscle arising by tendinous fibres from the spines of the first and Fig. 2. Fig. 2. Muscles of neck and shoulder, the trapezius and deltoid being cut short. B. Biceps. B. A. Brachialis anticus. C. M. Cerato-mandibular. C. Ma. Complexus major. C. Mi. Complexus minor. D. 1. First part of deltoid. D. 2. Second part of deltoid. D. M. Depressor mandibula?. E. H. Epi-coraco- humeral. I. S. Infraspinatus. L. G. Levator clavicula?. 0. H. Omo-hyoid. P. Pectoralis. S. C. M. Sterno-cleido-mastoid. S. Mg. Serratus magnus. 7*.l. External long head of triceps. 71 3. External humeral head of triceps. Tz. Trapezius, x. Fasciculus from complexus minor. The muscle between B. 2, S. Mg., and 711. is the subscapularis. Fig. 2 A. Deeper muscles of right side of neck, the levator clavicula? being cut short, the sterno-cleido-mastoid cut and reflected forwards, and the complexus major cut and raised. C. A. Cervicalis ascendens. C. Ma. Complexus major. C. Mi. Complexus minor. D. M. Depressor mandibula?. B. A. M. Rectus capitis anticus major. R. P. M. Rectus capitis posticus major. Sc. Scalenus. S. C. M. Sterno-cleido- mastoid. x. Fasciculus from complexus minor. |