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Memórias do Instituto Oswaldo Cruz
Fundação Oswaldo Cruz, Fiocruz
ISSN: 1678-8060
EISSN: 1678-8060
Vol. 90, No. 4, 1995, pp. 537-545
Bioline Code: oc95108
Full paper language: English
Document type: Research Article
Document available free of charge

Memórias do Instituto Oswaldo Cruz, Vol. 90, No. 4, 1995, pp. 537-545

 en Occurrence of "nuages" and "lamellae anulata" during spermatogenesis in dermatobia hominis (diptera: cuterebridae)
Irani Quagio-Grassiotto & Edy de Lello

Abstract

Various types of "nuages" and "lamellae anulata" can be found
during Dermatobia hominis spermatogenesis. In spermatogonia,
the "nuages" occur as granules juxtaposed to the cytoplasmic
face of the nuclear envelope or as cytoplasmic granules
similar to glycogen granules. In spermatocytes, in addition to
the "nuages", dense spherical bodies of approximately 1.0 um
in diameter are also observed. In the spermatids the "nuages"
can be of the following types: perinuclear granules, spherical
granules with diameters varying in length from 0.5 to 1.0 um,
granules similar to glycogen granules, granules with variable
diameters which accumulate at the flagellum base forming the
centriole adjunct, or remain in the cytoplasm. "Nuages" can
also be observed in these cellular types as dense masses,
without a definite outline and are common to animal germinal
cells in general. The "lamellae anulata" on the other hand,
are observed only in spermatocytes I and in early spermatids,
being always immersed in electron-dense material of indefinite
outline. In spermatids, the "lamellae anulata" are close to
the nuclear envelope suggesting, in spite of opposing
opinions, that these cells are envolved in the synthesis and
transport of material from the nucleus to the cytoplasm.

Keywords
Dermatobia hominis - spermatogenesis - "nuage" - "lamellae anulata"

 
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