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Animal Bioresource in Japan

.: Home > Animal Bioresource in Japan > 2009 > Volume 58 Number 1 > Tomo INOMATA1), Hiroyoshi NINOMIYA1), Katsuyasu SAKITA1), Naomi KASHIWAZAKI2), Junya ITO2), Makoto ARIGA3) and Seiya INOUE4)

Developmental Changes of Müllerian and Wolffian Ducts in Domestic Cat Fetuses

Tomo INOMATA1), Hiroyoshi NINOMIYA1), Katsuyasu SAKITA1), Naomi KASHIWAZAKI2), Junya ITO2), Makoto ARIGA3) and Seiya INOUE4)
1) Department of Laboratory Animal Science, School of Veterinary Medicine, Azabu University 2) Department of Animal Reproduction, School of Veterinary Medicine, Azabu University 3) Ariga Animal Hospital 4) ARK Resource Co., Ltd.
Abstract :

At 0.8 cm of crown-rump length (CRL) in sexually undifferentiated cat fetuses, the Wolffian duct is already observable on the ventro-lateral side of the mesonephros. At 1.2 cm CRL, the anlage of the Müllerian duct growing caudally in close parallel with the Wolffian duct was first observed. At 2.8 cm CRL in sexually differentiated fetuses, the Müllerian duct reached the urogenital sinus but remained indiscernible. Subsequently, at 3.2 cm CRL, regression of the upper part of the Müllerian duct was visible in males, while both ducts continued to grow in females. This suggests that the Müllerian inhibiting substance is produced before 3.2 cm CRL. At 7.0 cm CRL, male and female Wolffian ducts were reduced in diameter by about 50%, accompanied by involution of the mesonephros. Thereafter, the Wolffian duct was retained in the male; however, at 8.5 cm CRL in the female, the Wolffian duct was greatly reduced, by about 80% in diameter, then disappeared completely at 9.0 cm CRL.

Keywords :
cat, Müllerian duct, Wolffian duct

Date Deposited : 04 Jul 2011 09:54

Last Modified : 04 Jul 2011 09:54

Official URL: http://www.jstage.jst.go.jp/browse/expanim/_vols

Volume 58, Number 1, - 2009 , ISSN 1881-7122

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