Outlines of Comparative Anatomy And Medical Zoology
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By subdivision of the inner layer, a third or in- termediate layer is formed, in which is developed the circu- latory system. The first important subsequent change is observed in the external layer, where within a translucent space, a longitudinal (primitive) groove is formed, upon each side of which a fold (dorsal lamina, dorsal plate) arises. Such folds being converged join at the median line to con- vert the groove into a canal (neural canal) subsequently to contain the cerebro-spinal axis. ...Immediately beneath the spinal groove, indeed formed within its lower wall, a peculiar cartilaginous body, the * chorda dorsal is, ' is seen. The verte- bral column is commonly developed within the sheath of this structure, which, as a rule, soon thereafter disappears. While these changes are being effected the animal layer also extends laterally, partially, or entirely to enclose the yolk cavity.
Two types of development: (1) aquatic, and (2) terrestrial.
(1) Pisces. In cartilaginous fishes an osseous vertebral canal never appears.
What to read after Outlines of Comparative Anatomy And Medical Zoology?
You can find similar books in the "Read Also" column, or choose other free books by Harrison Allen to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
By subdivision of the inner layer, a third or in- termediate layer is formed, in which is developed the circu- latory system. The first important subsequent change is observed in the external layer, where within a translucent space, a longitudinal (primitive) groove is formed, upon each side of which a fold (dorsal lamina, dorsal plate) arises. Such folds being converged join at the median line to con- vert the groove into a canal (neural canal) subsequently to contain the cerebro-spinal axis. ...Immediately beneath the spinal groove, indeed formed within its lower wall, a peculiar cartilaginous body, the * chorda dorsal is, ' is seen. The verte- bral column is commonly developed within the sheath of this structure, which, as a rule, soon thereafter disappears. While these changes are being effected the animal layer also extends laterally, partially, or entirely to enclose the yolk cavity.
Two types of development: (1) aquatic, and (2) terrestrial.
(1) Pisces. In cartilaginous fishes an osseous vertebral canal never appears.
What to read after Outlines of Comparative Anatomy And Medical Zoology?
You can find similar books in the "Read Also" column, or choose other free books by Harrison Allen to read onlineMoreLess
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