ISSN:
0002-9106
Keywords:
Life and Medical Sciences
;
Cell & Developmental Biology
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Medicine
Notes:
The germ cells in the Japanese quail, appear in the gonadal area between two to two and one half days incubation with a preferential distribution favoring the left gonad. Proliferation of the primary or medullary cords from the germinal epithelium was observed between four and five and one half days. The secondary or cortical cords were found to proliferate in the left gonad on the sixth day. The right gonad revealed neither cortical cords nor cortex in any of the cases studied. It began to involute around eighth day and reached its minimum size by seven to ten days after hatching. In the adult it was composed of loose, or occasionally cord-like, epithelial cells, sparsely scattered “fat laden” cells, masses of lymphocytes and fibrous connective tissue, the latter predominating in older stages. Germ cells either disappeared or could no longer be recognized in the right gonad by four days after hatching. In the left ovary oogonia began to show meiotic changes by the eleventh day and primary follicles were present on the day of hatching. Ovulation was observed as early as 45 days after hatching. In female embryos the right Mullerian duct underwent atrophy and became a rudimentary cloacal remnant between eight and 14 days. In males complete atrophy of both left and right Mullerian ducts occurred between seven and 13 days. The mesonephric ducts persisted in females and were demonstrable throughout post-hatch period as thread-like structures.
Additional Material:
1 Tab.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/aja.1001230106
Permalink