File:An American text-book of physiology (1897) (14596845687).jpg

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Identifier: americantextbook00howe (find matches)
Title: An American text-book of physiology
Year: 1897 (1890s)
Authors: Howell, William H. (William Henry), 1860-1945 Bowditch, H. P. (Henry Pickering), 1840-1911
Subjects: Physiology
Publisher: Philadelphia : Saunders
Contributing Library: Columbia University Libraries
Digitizing Sponsor: Open Knowledge Commons

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Fig. 310—Stages in the fertilization of the egg (after Wilson). Thedrawings were made from sections of the eggs of the sea-urchin, Toxo-pneu)<teH variegatus, Ag. A. The surface of the egg has become elevated to form c, the entrance-cone for the spermatozoon; the head (h) and the middle-piece (m) of thelatter have entered the egg. B. Five minutes after entrance of the spermatozoon. The head (s),now the male pronucleus, has rotated 180 degrees, and has travelleddeeper into the ovum. The cytoplasm of the latter has become arrangedin a radiate manner about the middle-piece of the spermatozoon, now thecentrosome, to form the sperm-aster; e, the egg-nucleus, now the fe-male pronucleus, is approaching the sperm-nucleus; its chromatin formsan irregular reticulum; c, the entrance cone.
Text Appearing After Image:
Fig. 311.—Stages in the fertilization of the egg (continued from Fig. 310). c. Ten minutes after entrance of the spermatozoon. The male and the female pronuclei have metnear the centre of the egg and the fusion has begun; the former has become enlarged and its chromatinhas become loosely reticulated. The sperm-aster has become enormously enlarged. The single centro-some has been divided into two, which lie upon either side of the sperm-nucleus. D. The pause thirty minutes after entrance of the spermatozoon. The two pronuclei have fused com-pletely to form the first segmentation-nucleus, all trace of a distinction between paternal and maternalchromatin being lost. The sperm-aster has become divided into two asters, which have moved to oppo-site poles of the nucleus; the astral rays have become shortened. The egg is now ready to .undergosegmentation. 906 AN AMERICAN TEXT-BOOK OF PHYSIOLOGY. 1 11

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