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Ultrastructural aspects of the oesophageal and reproductive systems of the equine parasite Strongylus vulgaris

Published online by Cambridge University Press:  12 April 2024

M.S. Mobarak  and
M.F. Ryan
M.S. Mobarak
Affiliation:
Department of Zoology, University College Dublin, Belfield, Dublin 4, Ireland
M.F. Ryan*
Affiliation:
Department of Zoology, University College Dublin, Belfield, Dublin 4, Ireland
*
*Author for correspondence Fax: 353 1 706 1152 E-mail: mfryan@ucd.ie
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Abstract

The ultrastructure of the dorsal oesophageal gland ampulla and its relationship with the oesophagus, oesophageal ultrastructure, and control mechanisms in oesophageal activity were studied. Terminal ducts of the sub-ventral glands open through the oesophageal crown at the base of the buccal cavity. The terminal duct of the dorsal oesophageal gland running through the dorsal gutter opens to the exterior at the rim ‘groove’ of the buccal capsule. The posterior oesophageal region is clavate and the cuticle of the lumen folds to form outlet valves, ‘valvulae’. An inconspicuous oesophago-intestinal valve (three lobes) connects oesophagus and intestine and is visualized in the open and shut position. In the female reproductive tract, with the exception of the uterus, the cells lie on a thick, irregular (convoluted) basal lamina. The apical plasma membrane of the uterus, and seminal receptacle, extend into the lumen by microvilli-like projections with which spermatozoa make intimate contact. The lumen of the uterus is filled with oocytes, fertilized and unfertilized. Testicular cells have two parts linked by a rachis. Spermatocytes are elongated with a large nucleus, distinct nuclear membrane, and many granules. The apical membrane of the rachis forms long microvilli-like projections with balloon-like tips. The amoeboid spermatozoa contain membrane specializations, a nucleus devoid of a membrane, and are enclosed by a pseudopodial-like extension.

Type
Review Article
Information
Journal of Helminthology , Volume 76 , Issue 2 , June 2002 , pp. 143 - 155
Copyright
Copyright © Cambridge University Press 2002

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