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Titolo:
FETAL GENITAL DEVELOPMENT IN HYRAX-CAPENSIS, A SPECIES WITH PRIMARY TESTICONDIA - PROPOSAL FOR THE EVOLUTION OF HUNTERS-GUBERNACULUM
Autore:
VANDERSCHOOT P;
Indirizzi:
ERASMUS UNIV ROTTERDAM,FAC MED & HLTH SCI,DEPT ENDOCRINOL & REPROD,POB 1738 3000 DR ROTTERDAM NETHERLANDS
Titolo Testata:
The Anatomical record
fascicolo: 3, volume: 244, anno: 1996,
pagine: 386 - 401
SICI:
0003-276X(1996)244:3<386:FGDIHA>2.0.ZU;2-U
Fonte:
ISI
Lingua:
ENG
Soggetto:
TESTICULAR DESCENT; TESTIS;
Keywords:
HYRAX CAPENSIS; DASSIE; TESTICONDIA; TESTIS DESCENT; GENITAL DEVELOPMENT; EMBRYOLOGY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
54
Recensione:
Indirizzi per estratti:
Citazione:
P. Vanderschoot, "FETAL GENITAL DEVELOPMENT IN HYRAX-CAPENSIS, A SPECIES WITH PRIMARY TESTICONDIA - PROPOSAL FOR THE EVOLUTION OF HUNTERS-GUBERNACULUM", The Anatomical record, 244(3), 1996, pp. 386-401

Abstract

Background: Control of testicular descent is poorly understood. Thereare a number of mammalian species in which testis descent does not occur, and the phenomenon is called testicondia. Analysis of foetal development of such species could contribute to a better understanding of the key events in anatomical development underlying testis descent. Specific attention is to be given to the development of the so-called gubernaculum of Hunter: a structure of complex architecture and composition, which extends from the caudal pole of the mesonephric remnants into the inguinal abdominal wall and which is present in most mammals but not in submammalian vertebrates. Methods: Serially sectioned male and female foetuses of Hyrax capensis, a species in which testes remain close to the caudal pole of the kidneys throughout life, were analysedfor architecture of the developing genital apparatus and the immediately surrounding structures. The results of this analysis were comparedwith those from a similar analysis of reptiles, of monotremata without testis descent, and of mammals with testis descent. Results: Reptiles and Monotremata showed no gubernacular structures. Mammals with testis descent showed gubernacular growth and differentiation which variedbetween the sexes and with the stage of foetal development. Hyrax capensis foetuses showed the development of only one component of the gubernaculum: the gubernacular cord as a part of the mesonephric mesentery and extending between the caudal pole of the mesonephros (or mesonephric remnants in older foetuses) and the lateral bladder ligament. No part developed in the inguinal abdominal wall components, which are the primordia of the cremaster sacs in species with testis descent. Conclusion: Hyrax capensis shows only partial development of the gubernacular structures, and, specifically, the primordia of the cremaster sacsremain absent. Thus, this species lacks a key anatomical condition for testis descent. Gubernacular architecture in Hyrax capensis seems ofa degree intermediate between egg laying monotremata mammals and mammals with testis descent. A model is proposed within which to understand the development of the gubernacular components within the mammalian class. (C) 1996 Wiley-Liss, Inc.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 05/12/20 alle ore 00:55:03