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Show 262 MR. ST. GEORGE MIVART O N [Apr. 22, its fellow of the opposite side, a thin transverse sheet of muscular fibres immediately beneath the skin. It springs from the inner surface of the lower margin of the mandible, almost as far backwards as the articulation of the latter with the suspensorium. Its fibres incline slightly backwards; and a sort of faint linea alba is interposed between it and its fellow of the opposite side. The mylo-hyoideus posterior (figs. 1, 2, & 3, M. H. 2), with its fellow, forms another thin transverse sheet of muscular fibres placed immediately beneath the skin, except where the mylo-hyoideus anterior is superficial to it. It springs from the dorsal fascia and from that over the cornu of the hyoid, and covers the hinder portion of the digastric and part of the levator arcuum. Submentalis (fig. 2, S. M ) . This small, azygos, transverse muscle connects together the anterior ends of the two mandibular rami. It is placed immediately above the most anterior portions of the mylo-hyoidei anteriores, and is much connected with them and with the genio-hyoidei. Deeper muscles of right side, the mylo-hyoidei, the trapezius, and the latissimus dorsi being removed or cut short. A. A. Adductor arcuum. CA. Constrictor arcuum. CF. Constrictor faucium. C. H. E. Cerato-hvoideus externus. C. H. I. Cerato-hyoideus internus. D. Deltoid. D.l&D. 2. Digastric. Ex. 0. External oblique. G. H. Genio-hyoideus. In. 0. Internal oblique. L. A. S. Levator anguli scapulae. L. D. Latissimus dorsi. M. Masseter. S. Subclavius. S. M. Serratus magnus. T. Trapezius. Constrictor faucium* (figs. 2, 3, and 5, C. F). This muscle springs from the under surface of the dorsal segment of the second branchial arch (i. e. the second after the hyoidean cornu), and is inserted into a fascia beneath the throat, into which the genio-hyoid of the same side is also inserted. As the constrictor faucium passes downwards it is overlapped (and strapped in, as it were) by the band-like constrictor arcuum. The constrictor pharyngis is a delicate muscular sheet arising * Constrictor faucium internus of Schmidt, &c, see I. c. p. 29, and pl. 6. fig. xiii. 4. |
