Ultrastructural study of spermatogenesis and the spermatozoon in Postorchigenes gymnesicus (Trematoda, Lecithodendriidae)

Journal of Morphology
M GraceneaM Trullols

Abstract

An ultrastructural study of spermatogenesis, spermiogenesis, and spermatozoa in Postorchigenes gymnesicus is presented. Cytoplasmic projections originating in nurse cells surround the spermatogonia, which are located at the periphery of the testes. Primary spermatocytes attached to a cytophore show synaptonemal complexes and a pair of centrioles. Spermiogenesis begins with the appearance of a cytoskeletal structure formed by an intercentriolar body and two perpendicular centrioles. An axoneme and a striated rootlet emerge from each centriole. The progressive rotation and fusion of both flagella with the median process occurs simultaneously with the migration of nucleus to the distal tip of the forming spermatozoon. The mature spermatozoon consists of three regions: (1) the nuclear region, containing the nucleus, one mitochondrion, two 9+1 axonemes, and cortical microtubules; (2) the intermitochondrial region, containing two axonemes; and (3) the mitochondrial region with another mitochondrion, two axonemes, cortical microtubules, and external ornamentation symmetrically and asymmetrically arranged coincidental with the cortical microtubules. Glycogen particles, absent in testicular cells, are abundant in the spermatozoon. Ultra...Continue Reading

References

Feb 1, 1988·International Journal for Parasitology·H T Hendow, B L James
Jan 1, 1969·Journal of Ultrastructure Research·A R Spurr
Dec 1, 1982·Journal of Ultrastructure Research·J L Justine, X Mattei

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Citations

Feb 28, 2008·Journal of Morphology·Cristina L C de OliveiraStanley H Weitzman
Jun 26, 2007·Journal of Helminthology·A A AshourI S Gamil
Jan 11, 2002·Memórias do Instituto Oswaldo Cruz·M Pamplona-BasilioA Kohn
Nov 14, 2014·Parasite : Journal De La Société Française De Parasitologie·Abdoulaye Jacque BakhoumBernard Marchand

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