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Histological Study of the Male Internal Genital Tract of Dwarf Caiman (Paleosuchus palpebrosus Cuvier, 1807)

Authors

  • Teresinha Inês Assumpção Email ORCID Teaching and Research Laboratory in Wild Animals, Federal University of Uberlandia, Uberlandia, Brazil
  • Adrielly Julien Silva Lopes ORCID Teaching and Research Laboratory in Wild Animals, Federal University of Uberlandia, Uberlandia, Brazil
  • Lilja Fromme ORCID University of Veterinary Medicine Hannover, Hannover, 30559, Germany
  • André Luís Quagliatto Santos ORCID Teaching and Research Laboratory in Wild Animals, Federal University of Uberlandia, Uberlandia, Brazil

DOI:

https://doi.org/10.30564/jzr.v3i3.3448
Received: 11 July 2021 | Published Online: 2 August 2021

Abstract

Brazil has six species of crocodiles belonging to the subfamily Caimaninae,
one of them being Paleosuchus palpebrosus (Cuvier, 1807) (dwarf caiman).
It is considered one of the smallest crocodilian species, and is sensitive to
environmental changes. The anatomical and histological descriptions of
the reproductive tract of reptiles are scarce, so it is important to study the
morphology of the genital tract of caimans for a better understanding of the
reproduction of these species. We performed the histological analysis of the
testis, epididymis, and deferent duct of the dwarf caiman Paleosuchus pal
pebrosus. Structures of the genital tract were collected from euthanized an
imals. Testes, epididymis, and deferent ducts were separated and prepared
according to routine histological techniques for morphological characteriza
tion. The testis is covered by a capsule of fibromuscular connective tissue.
Spermatogonia are observed as spherical cells with round nuclei and loose
chromatin, and primary spermatocytes show dark cytoplasm, round nuclei,
and pale chromatin. Spermatids are seen as cylindrical or filamentous cells
with nuclei that may be highly condensed, ranging from round to oval. The
epididymis is observed as a coiled duct lined by a tall cuboidal epithelium
with stereocilia; the deferent duct shows ciliated pseudostratified cylindri
cal epithelium. The adrenal gland is found in the dorsomedial portion of the
testis. The histological structure of the reproductive tract of Paleosuchus
palpebrosus is similar to that of other reptiles’species.

Keywords:

Reptiles, Crocodylomorpha, Testis, Epididymis, Spermatogenesis, Histology

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2021 Vol.3 No.3

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Copyright © 2021 Teresinha Inês Assumpção, Adrielly Julien Silva Lopes, Lilja Fromme, André Luís Quagliatto Santos

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