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By Douglas Webster and Molly Webster (Auth.)

ISBN-10: 0127408509

ISBN-13: 9780127408507

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62 Cranial skeleton The head skeleton both supports the gills and facilitates respiration by moving water past the gills. Water is brought into the mouth; then the mouth is closed, and its floor raised by contraction of the muscles between the two sides of the lower jaw; this forces water past the gills where gas exchange takes place. Despite the morphological separation of the bowfin's neurocranium, splanchnocranium, and dermatocranium, therefore, these three components of the head skeleton are intimately connected functionally.

2-10. These three animals, from the three basic divisions of the class Mammalia, have parallelly evolved powerful claws and long snouts and tongues for digging out and capturing ants and termites. They are (A) the spiny anteater, a prototherian; (B) the banded anteater, a metatherian; and (C) the giant anteater, a eutherian. and there are only two living groups, the duck-billed platypus and the spiny anteaters, which are both of particular interest to the comparative morphologist. , hair, mammary glands, and a "mammalian" jaw joint.

It is the structure of the matrix which determines the type of cartilage and its physical properties. drium), and the metabolic needs of the chondrocytes are satisfied by diffusion through the matrix, often for considerable distances. Development of cartilage Embryologically, cartilage develops from two sources. That which forms the visceral skeleton and anterior neurocranium of the head is of neural crest origin and is formed in the following manner. In the pharyngula head region the neural crest element is especially large, and much of it migrates to the anterior splanchnic mesoderm.

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Comparative Vertebrate Morphology by Douglas Webster and Molly Webster (Auth.)


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