. Éléments de l'anatomie comparée des vertébrés. Anatomie, comparatif. 70 L'anatomie comparative quadrangulaire, qui sert de support (suspensormm) pour les mâchoires, l'autre reste séparé de la boîte crânienne par un articulationâ c'est, n'est qu'unie à elle par-tissueâor conjonctif il forme une masse avec elle. Le hyoidâwhich a toujours des relations étroites avec l'homme- dibular,arch, et peuvent aussi prendre part à son suspensorial j'appareil. Tig. 53.âDiagrammatic ! Un Embryoxic Elasmobeakch Figdke du crâne, montrant les relations de l'viscebal arches. iV, capsule nasale ; A, œil ; le 0, capsule auditive ; Tr

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. Elements of the comparative anatomy of vertebrates. Anatomy, Comparative. 70 COMPARATIVE ANATOMY The quadrate, which serves as a support (suspensormm) for the jaws, either remains separated from the skull by an articulationâ that is, is only united to it by connective-tissueâor it forms one mass with it. The hyoidâwhich has always close relations with the man- dibular arch, , and may also take part in its suspensorial apparatus i. Tig. 53.âDiagrammatic! Figdke of an Embryoxic Elasmobeakch Skull, showing the relations of the viscebal arches. iV, nasal capsule ; A, eye ; 0, auditory capsule ; Tr, trabecula; Q and PQ, quadrate and palatopterygoid, which are bound to the trabecula by ligaments at t; Jf, Meckel's cartilage; L, labial cartilages; H, hyomandibular ; K, hyoid arch ; a to e, branchial arches, between which the gill-clefts {I-to V) are seen ; i9, spiracle; C, notochord ; 6, vertebriE, br, brain ; lip.c, spinal cord. âbecomes divided, as do the true branchial arches, into a number of segments, the upper of which in many Fishes is distinguished as the hyomandibular (Fig. 53), from which a sympkclic may be differentiated distally. In the mid-ventral line there is a basi-hyal connecting the arch of either side, and embedded in the tongue (entoglossal or glossohyal). c. The Bones of the Skull. It is usual and convenient to distinguish in the entire skeleton between the bones which are formed in connection with cartilage, and eventually replace it to a greater or less extent (^cartilage â â It appears to be probable that the hyomandibular and hyoid proper are separate in origin : possibly also the xjiiracidar cartilage (p. 75), often looked upon as representing fused mandibular rays, represents the remains of an entire arch ; and Dohrn maintains that Meckel's cartilage and the palatoquadi-ate each represents a distinct arch.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloratio

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