File:Carpenter's principles of human physiology (1881) (14801578303).jpg

Identifier: carpentersprinci00carp (find matches)
Title: Carpenter's principles of human physiology
Year: 1881 (1880s)
Authors: Carpenter, William Benjamin, 1813-1885 Meneses, Henry Power
Subjects: Human physiology Physiology
Publisher: London : J. & A. Churchill
Contributing Library: Francis A. Countway Library of Medicine
Digitizing Sponsor: Open Knowledge Commons and Harvard Medical School

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Later stage in tie Segmentation, of the Yolk of the Mammalian Ovum :—at a is shown the mulberry-mass formed by the minute subdivision of thevitelline spheres; at b a further increase has brought its surface into contactwith the vitelline membrane, against which the spherules are flattened
Text Appearing After Image:
Section of the Germinal Disk of a Fowl during the later Stages of Segmentation. The sectionwhich represents rather more than half the breadth of the blastoderm (the middle line being at c)shows that the upper and central parts of the disk segment faster than those be ow, IK theperiphery. In the majority of segments a nucleus can be seen, and one is probably present in all1 he segments contain a number of highly refracting spherules. In the central part of the Mastodermthe upper eels have commenced to form a distinct layer. No segmentation cavity is prese™a large peripheral cell; 6 larger cells of the lower parts of the blastoderm j c, middlltoeof blasto-derm ; e, edge of the blastoderm adjoining the white yolk; w, white yolk. becomes separated from the white yolk, on which it has hitherto been lying, by aspace containing fluid, termed the segmentation cavity (see Fig. 332), and withthis a distinction becomes apparent between the upper and lower layers of* For theories in. regard to

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