Outlines of Comparative Anatomy And Medical Zoology
The book Outlines of Comparative Anatomy And Medical Zoology was written by author Harrison Allen Here you can read free online of Outlines of Comparative Anatomy And Medical Zoology book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Outlines of Comparative Anatomy And Medical Zoology a good or bad book?
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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.
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