. Sull'anatomia dei vertebrati. Vertebrati, Anatomia, comparativo; 1866. 98 anatomia di vertebrati.. Disarticulated prosL-in-ciilinlic ! Segmenti di due archi e un centro comune; ma tlie consti- tuent le ossa sono state oggetto di ulteriori modifiche estreme. Il centrum, chiamato ' presphenoid", fig. 79, 9, è prodotto molto avanti, leggermente in espansione; tlie neurapophyses, chiamato ' orbito- sphenoids,' ib. Ecco, sono piccoli semi- piastre ovali, proteggendo i fianchi del cervello; la colonna vertebrale neurale o chiave-osso dell'arco, chiamato ' frontale,' ib. 11, è enormemente ampliato, ma in Cod è unico ; t

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. On the anatomy of vertebrates. Vertebrates; Anatomy, Comparative; 1866. 98 ANATOMY OF VERTEBRATES.. Disarticulated prosL-in-ciilinlic ! segments, of two arches and a common centre; but tlie consti- tuent bones have been subject to more extreme modifications. The centrum, called ' presphenoid, ' fig. 79, 9, is produced far forward, slightly expanding; tlie neurapophyses, called ' orbito- sphenoids, ' ib. lo, are small semi- oval plates, protecting the sides of the cerebrum; the neural spine, or key-bone of the arch, called ' frontal, ' ib. 11, is enormously expanded, but in the Cod is single ; the diapophyses, called ' post-frontals, ' ib. 12, jn-oject outward from the hinder angles of the frontal, and give attachment to the piers of the inverted htcmal arch. The first bone of this arch is com- mon in Fishes to it and to that of the last described vertebra, being the bone called ' epitympanic, ' fig. 81, 25 ; this modification is called for by the necessity of consentaneous move- ments of the two inverted arches, in connection with the deglutition and course of the streams of water req^uired for the branchial respiration. The hremal arch of the present segment — enormously developed — is plainly divided primarily on each side into a pleurapophysis and hrema- pophysis; for these elements are joined together by a movable articulation, whilst the bones into which they are subdivided arc suturally interlocked together. The pleurapophysis is so subdivided into four pieces; the upper one, articulating Avith the postfrontal and mastoid—the diapophyses of the two middle segments of the skull—is called 'epitympanic, ' ib. 25; the hind- most of the two middle pieces is the 'mesotympanic, ' h. 26: the foremost of the two middle pieces is the ' pretympanic, " ib. 27; the lower piece is the hypotympanic, h. 2S ; this presents a joint- surface, convex in one way, concave in the other, called a ' glngly- moid condyle, ' for the h;»mapophysis, or lower division of the arch

Parole chiave associate all'immagine

• bookauthorowenrichard18041892
• bookcentury1800
• bookdecade1860