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Fig. 7. Diagram of the development of the primitive germ cells

Diagram of the development of the primitive germ cells (I in the zone of increase) — the primitive sperm cells to the left, the primitive ova to the right — into spermatids and spermia or into ovia; II and III in the lone of increase represent the spermatogonia and odgonia. The upper small cells in the lone of growth enlarge to form spermatocytes or oocytes (etO of the first order. By the division of these cells (I in the maturation sone) there are formed (to the left) two spermatocytes of the second order (prespermatids) or (to the right) an oocyte of the second order (ei*) and a first olocyte (psO). The sucoeeding division, represented at II in the maturation sone, produces the spermatids (1, 2, 3, 4, to the left) or a mature ovum (et'), together with the second polocyte (pt*). A division of pz^ may also take place and then there will be formed, to the right as well as to the left, four descendants from the cells represented by I of the maturation zone.

(After Boveri and O. Hertwig, from Waldeyrer's "Geschlechtssellen" in Hertwig's Handb., vol. i, part i, p. 225, Fig. 55.

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Cite this page: Hill, M.A. (2024, April 25) Embryology Keibel Mall 007.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Keibel_Mall_007.jpg

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current	20:10, 12 February 2012		592 × 834 (152 KB)	S8600021 (talk \| contribs)	==Fig. 7. == {{Keibel_Mall Images}}

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-==Fig. 7. ==
+==Fig. 7. Diagram of the development of the primitive germ cells==
+Diagram of the development of the primitive germ cells (I in the zone of increase) — the primitive sperm cells to the left, the primitive ova to the right — into spermatids and spermia or into ovia; II and III in the lone of increase represent the spermatogonia and odgonia. The upper small cells in the lone of growth enlarge to form spermatocytes or oocytes (etO of the first order. By the division of these cells (I in the maturation sone) there are formed (to the left) two spermatocytes of the second order (prespermatids) or (to the right) an oocyte of the second order (ei*) and a first olocyte (psO). The sucoeeding division, represented at II in the maturation sone, produces the spermatids (1, 2, 3, 4, to the left) or a mature ovum (et'), together with the second polocyte (pt*). A division of pz^ may also take place and then there will be formed, to the right as well as to the left, four descendants from the cells represented by I of the maturation zone.
+(After Boveri and O. Hertwig, from Waldeyrer's "Geschlechtssellen" in Hertwig's Handb., vol. i, part i, p. 225, Fig. 55.
 {{Keibel_Mall Images}}