Effects of photoperiod on structure of lamina propria of the testis of Octodon degus
Author
dc.contributor.author
Rojas, M. A.
Author
dc.contributor.author
Morales, B.
Author
dc.contributor.author
Esponda, P.
Admission date
dc.date.accessioned
2019-03-18T11:54:59Z
Available date
dc.date.available
2019-03-18T11:54:59Z
Publication date
dc.date.issued
1995
Cita de ítem
dc.identifier.citation
Journal of Morphology, Volumen 226, Issue 3, 2018, Pages 331-338
Identifier
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10974687
Identifier
dc.identifier.issn
03622525
Identifier
dc.identifier.other
10.1002/jmor.1052260308
Identifier
dc.identifier.uri
https://repositorio.uchile.cl/handle/2250/166898
Abstract
dc.description.abstract
The changes occurring in the testicular lamina propria (LP) of the seasonal breeder Octodon degus were analyzed. Four groups of animals were studied using electron microscopic procedures. The animals in group I were reproductively active, whereas those in groups II, III, and IV were in periods of recrudescence, regression, and resting, respectively. These changes, observed in animals maintained under laboratory lighting conditions, resembled those known to be elicited in feral populations by natural photoperiods. Testicular changes in each group were monitored by calculating the gonadosomatic and spermatogenetic indexes, and by obtaining averages of the diameter of the seminiferous tubules and the height of the seminiferous epithelium. The LP of group I animals consisted of a basal membrane formed by two to four lamellae, inner and outer acellular layers containing moderate numbers of collagenous fibrils, and single or double layers of smoothly contoured myoid cells encircled by a disc