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Titolo:
The cycle of the seminiferous epithelium in the greater Japanese shrew mole, Urotrichus talpoides
Autore:
Mizukami, T; Kuwahara, S; Ohmura, M; Iinuma, Y; Izumikubo, J; Hagiwara, M; Kurohmaru, M; Hayashi, Y; Nishida, T;
Indirizzi:
Univ Tokyo, Grad Sch Agr & Life Sci, Dept Vet Anat, Bunkyo Ku, Tokyo 1138657, Japan Univ Tokyo Tokyo Japan 1138657 Vet Anat, Bunkyo Ku, Tokyo 1138657, Japan Nihon Univ, Coll Bioresource Sci, Lab Anat & Physiol, Fujisawa, Kanagawa 2528510, Japan Nihon Univ Fujisawa Kanagawa Japan 2528510 isawa, Kanagawa 2528510, Japan
Titolo Testata:
JOURNAL OF VETERINARY MEDICAL SCIENCE
fascicolo: 1, volume: 63, anno: 2001,
pagine: 31 - 35
SICI:
0916-7250(200101)63:1<31:TCOTSE>2.0.ZU;2-4
Fonte:
ISI
Lingua:
ENG
Soggetto:
SPERMATOGONIAL RENEWAL; SUNCUS-MURINUS; MUSK SHREW; SPERMATOGENESIS; DURATION; KINETICS;
Keywords:
cycle of the seminiferous epithelium; greater Japanese shrew mole; insectivore; spermatogenesis; spermiation;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
30
Recensione:
Indirizzi per estratti:
Indirizzo: Mizukami, T Univ Tokyo, Grad Sch Agr & Life Sci, Dept Vet Anat, Bunkyo Ku,Tokyo 1138657, Japan Univ Tokyo Tokyo Japan 1138657 nkyo Ku, Tokyo 1138657, Japan
Citazione:
T. Mizukami et al., "The cycle of the seminiferous epithelium in the greater Japanese shrew mole, Urotrichus talpoides", J VET MED S, 63(1), 2001, pp. 31-35

Abstract

Spermatogenesis and acrosomal formation in the greater Japanese shrew mole, Urotrichus talpoides, were studied by light microscopy. On the basis of acrosomal changes, morphology of spermatid head, nuclear shape, appearance of meiotic figures, location of spermatid and period of spermiation, the cycle of the seminiferous epithelium was classified into 12 stages, and developing spermatids could be divided into 15 steps. The mean relative frequencies of stages from I to XII were 10.9, 8.7, 9.8, 7.3, 8.5, 10.3, 12.5, 8.7, 5.8, 5.4, 5.1 and 7.1%, respectively. Similar to the case in the musk shrew, the spermatid nucleus of the greater Japanese shrew mole remained in the middle region of the seminiferous epithelium and only the acrosome extendedtowards the basement membrane. The elongation of the acrosome, however, was not prominent. The proacrosomal vesicle first appeared in stage II and then one large and round granule was seen in stage III. The acrosomal vesiclebecame flattened on the surface of the nucleus in stage IV. Spreading of the acrosomic system has been recognized from stage VII. In stage VII, spermiation occurred. In stage IX, the spermatid nucleus began to elongate. Elongation and condensation of the nucleus were clearly observed in stage X. Instage XII pachytene spermatocytes divided into diplotene spermatocytes. Instage XII, meiotic figures and secondary spermatocytes were observed.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 06/04/20 alle ore 02:17:38