WROBEL, KH and KESSLER, M and SCHIMMEL, M (1993) QUANTITATIVE EVALUATIONS OF THE TUBULAR EPITHELIUM IN THE TESTIS OF THE FALLOW DEER (DAMA-DAMA). REPRODUCTION IN DOMESTIC ANIMALS, 28 (1). pp. 1-13. ISSN 0936-6768,
Full text not available from this repository.Abstract
The quantitative morphology of the seminiferous epithelium was studied in 10 testes of 16- to 17-monthsold fallow bucks (Dama dama). Seminiferous tubules constitute 77.2% of the testicular parenchyma and amount to a total length of 400-750 m per testis. According to varying cell associations 6 different stages can be observed during the spermatogenic cycle. The average tubular diameter varies between 215 mum (stage 1) and 230 mum (stage 8), the epithelial height between 67.6 mum in stage 3 and 71.9 mum in stage 8 when spermiation occurs. From primary spermatocytes during the prophase of the first meiotic division preleptotenes have smallest nuclear (203.7 mum3) and cellular (469.1 mum3) volumes, whereas late diplotenes show a nuclear volume of 846.7 mum3 and a cellular volume of 3440.5 mum3, that is an increase of more than 4 times for the nucleus and more than 7 times for the cell body. Numerical analysis reveals 4 spermatogonial divisions and a considerable loss of spermatogenic cells during the second meiotic division and subsequent spermiogenesis. Sertoli cells constitute between 31.4% (stage 4) and 38.3% (stage 1) of the tubular epithelium. The calculated cell volume of an individual Sertoli cell increases during every cycle from 6515.3 mum3 in stage 3 to 8350.0 mum3 in stage 8; that is a volume change of 22%. The Sertoli cell organelle with most prominent cyclical variations is the endoplasmic reticulum. A lipid cycle is absent in the seminiferous epithelium of the fallow deer.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | BUFFALO BUBALUS-BUBALIS; SEMINIFEROUS EPITHELIUM; SERTOLI CELLS; POSTNATAL-DEVELOPMENT; SPERMATOGENESIS; CYCLE; MORPHOLOGY; BULL; TESTIS; SPERMATOGENESIS; SERTOLI CELLS; MORPHOMETRY; FALLOW DEER (DAMA-DAMA) |
| Depositing User: | Dr. Gernot Deinzer |
| Last Modified: | 19 Oct 2022 08:43 |
| URI: | https://pred.uni-regensburg.de/id/eprint/54143 |
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