The fine structure of spermatogenesis in Hymenolepis diminuta (Cestoda) with a description of the mature spermatozoon View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

1977-01

AUTHORS

G. H. Kelsoe, John E. Ubelaker, Venita F. Allison

ABSTRACT

The processes of spermatogenesis and spermiogenesis in Hymenolepis diminuta were studied by electron microscopy using improved preparative techniques. Spermatogonia (Type A) are characterized by nuclei 3.79 (±0.17) μm in diameter, dense cytoplasm packed with free ribosomes, and aggregates of mitochondria. After mitoses, certain spermatogonia (Type B) assume syncytial rosettes containing eight nuclei. Primary spermatocytes maintain the rosette syncytium and have large nuclei (4.28±0.24 μm in diameter), smooth endoplasmic reticulum, and polysomes. The secondary spermatocyte is short-lived and is characterized by nuclei (2.0±0.11 μm in diameter) and perinuclear membranous lamellae. The syncytial spermatid cluster contains avoid nuclei which condense and elongate to a final diameter of 0.22±0.04 μm. Once elongated, these nuclei become delimited from the syncytium by invaginations of the plasma membrane. During delimitation, cortical peripheral microtubules arise beneath the spermatozoon plasmalemma and a 9+1 axoneme extends the length of the mature lance-shaped spermatozoon. More... »

PAGES

175-187

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/bf00380800

DOI

http://dx.doi.org/10.1007/bf00380800

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1019794154

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/605649


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207 rdf:type schema:Organization
 




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