. La myologie du corbeau (Corvus corax sinuatus.) Un guide pour l'étude du système musculaire chez les oiseaux . côtés. La partie médiane de cette strate musculaire extrêmement atténuée est très 22 LE MYOLOGY DU CORBEAU. Difficile à tracer à fond dans les échantillons plus jeunes de Ravens, et il admet de notre voir les structures de soubatement à travers elle. Les fibres délicates de theplatysma myoides la supertendent, tandis que son fasciculifimélange antérieur avec ceux du mylo-hyoideus. Selon Mivart, chez les oiseaux et les reptiles, le di-gastrique descend de la partie de l'obstacle du crâne jusqu'à l'extrémité postérieure du m
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. The myology of the raven (Corvus corax sinuatus.) A guide to the study of the muscular system in birds . sides. The middle portion ofthis extremely attenuated muscular stratum is very 22 THE MYOLOGY OF THE RAVEN. difficult to thoroughly trace in the younger specimensof Ravens, and it admits of our seeing the underly-ing structures through it. The delicate fibres of theplatysma myoides overlie it, while its anterior fasciculiblend with those of the mylo-hyoideus. According to Mivart, in birds and reptiles the di-gastric descends from the hinder part of the cranium tothe posterior end of the mandible, and in some birds isdivided into three portions (Elem, Anat., p. 313). Aswe have just seen, it is still different in the Corvidce. The chief use of this muscle would seem to be toraise the hyoid apparatus and trachea against the pha-rynx, after a morsel of food has passed that point, toprevent its return to the mouth, and assist its passagedown the oesophagus. III. THE MUSCLES OF THE TONGUE. IN this section I will speak of those muscles of theRaven which I have found upon dissection to be, in. FIG. 6.—Under side of mandible of a Raven, designed to show the sites ofmuscular attachment ; life-size, from the authors dissections. some way or another, attached to the hyoidean apparatus, and involved in its movements. 24 THE MYOLOGY OF THE RAVEN. In Fig. 7, and other illustrations to this work, Ihave made careful drawings of these parts, and en-deavoured to present this group of muscles in such amanner as they can best be seen and studied. The following are presented for our examination :— 21. Mylo-hyoideus. 25. Sterno-hyoideus. 22. Stylo-hyoideus. 26. Depressor-glossus. 23. Genio-hyoideus. 27. Cerato-glossal. 24. Cerato-hyoideus. 21. The mylo-hyoideus1 (Figs. 5, 11, and 17).--Thismuscle arises on the inner side of the mandible, just above 1 Professor Hans Gadow sees two parts to the mylo-hyoideus inbirds, his M. MYLO-HYOIDEUS ANTERIOR corresponding to my inylo-hyoideus,
