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Show 264 MR. ST. GEORGE MIVART ON [Apr. 22, Omo-hyoideus (fig. 6, O. H). This is a flat band of muscle which springs from the lower part of the anterior margin of the scapula, and, passing forwards, downwards, and inwards, loses itself in the lateral part of the sterno-hyoid, with which it coalesces. Fig. 6. Deepest muscles of outside of right shoulder, the trapezius and subclavius being cut short to show the omo-hyoid. D, Deltoid. L. A. S. Levator anguli scapula1. 0. H. Omo-hyoideus. S. Subclavius. T. Trapezius. Genioglossus. I have not succeeded in defining this muscle ; but, according to Dr. Fischer*, it is represented by some fibres which pass from the hinder surface of the mandibular symphysis to the skin of the mouth. This is not the genioglossus of Schmidt &c, which is m y submentalis-j*. APPENDICULAR MUSCLES. PECTORAL LIMB. Trapezius (figs. 1, 3, 5, & 6, T). This is a small subtriangular muscle which arises from the fascia outside the trunk-muscles, and immediately behind the levator arcuum and mylo-hyoideus externus. Passing downwards and slightly backwards, it is inserted into the angle between the scapula and the precoracoid (of Parker), but mainly into that side of the angle which is formed by the lower end of the anterior margin of the scapula. The latissimus dorsi (figs. 1, 3, & 5, L. D) is a small triangular muscle of about the same size as the trapezius. It arises from the fascia outside the dorsal muscles, and, passing downwards and forwards, is partly inserted into the head of the humerus, and, partly fusing with the triceps, is continued on by that muscle to the proximal end of the ulna. The pectoralis (fig. 2, P. 1 & P. 2) consists of two parts with a common insertion. The first and larger part springs from the surface of the superficial abdominal muscles; the second portion from the sternum. They are inserted into the inner side of the radial (greater) tuberosity of the humerus. Serratus magnus (fig. 5, 8. M). This very small muscle arises * L.c. p. 66. t L.c. tabb. 6, 7. |