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

  • M.S. Mobarak (a1) and M.F. Ryan (a1)

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.

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*Author for correspondence Fax: 353 1 706 1152 E-mail: mfryan@ucd.ie

References

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Bennet-Clark, H.C. (1976) Mechanics of nematode feeding. pp. 313340in Croll, N.A. (Ed.) The organisation of nematodes. London, Academic Press.
Bird, A.F. (1971) The structure of nematodes. 318 pp. London, Academic Press.
Bird, A.F. & Bird, J. (1991) The structure of nematodes. 2nd edn. London, Academic Press.
Burgess, T.L. & Kelly, R.B. (1987) Constitutive and regulated secretion of proteins. Annual Review of Cell Biology 3, 243293.
Caffrey, C.R. & Ryan, M.F. (1994) Characterisation of proteolytic activity of excretory-secretory products from adult Strongylus vulgaris. Veterinary Parasitology 52, 285296.
Chitwood, B.G. & Chitwood, M.B. (1974) An introduction to nematology. 213 pp. Baltimore, Maryland Monumental Printing Co.
Colam, J.B. (1971) Studies on gut ultrastructure and digestive physiology in Cyathostoma lari (Nematoda: Strongylida). Parasitology 62, 273283.
Endo, B.Y. & Wergin, W.P. (1988) Ultrastructure of the root-knot nematode, Meloidogyne incognita. Proceedings of the Helminthological Society of Washington 55, 286316.
Foor, W.E. (1970) Spermatozoon morphology and zygote formation in nematodes. Biology of Reproduction 2 (Supplement), 177202.
Hussey, R.S. & Mims, C.W. (1990) Ultrastructure of oesophageal glands and their excretory products in the root-knot nematode Meloidogyne incognita. Protoplasma 156, 918.
Hussey, R.S., Paguio, O.R. & Seabury, F. (1990) Localization and purification of a secretory protein from the oesophageal glands of Meloidogyne incognita with a monoclonal antibody. Phytopathology 80, 709714.
Immink, B.D.C.M. (1924) On the microscopical anatomy of the digestive system of Strongylus edentatus Looss. Archives of Anatomy, Histology and Embryology 3 (4-6), 281326.
Jennings, J.B. & Colam, J.B. (1970) Gut structure, digestive physiology and food storage in Pontonema vulgaris (Nematoda: Enoplida). Journal of Zoology 161, 211221.
Lee, D.L. (1968) The ultrastructure of the alimentary tract of the skin-permeating larve of Nippostrongylus brasiliensis (Nematoda). Journal of Zoology 154, 918.
Lee, D.L. (1969) Nippostrongylus brasiliensis: some aspects of the fine structure and biology of the infective larva and the adult. Nippostrongylus and Toxoplasma. pp. 316in Taylor, A.E.R. (Ed.) Symposia of British Society for Parasitology vol. 1, Oxford, Blackwell.
Lee, D.L. (1971) The structure and development of the spermatozoon of Heterakis gallinarum (Nematoda). Journal of Zoology 164, 181187.
Lee, D.L. & Atkinson, H.J. (1976) Physiology of nematodes. 2nd edn. London and Basingstoke, The Macmillan Press Ltd.
Levine, N.D. (1980) Nematode parasites of domestic animals and man. 2nd edn. 477 pp. Minneapolis, Minnesota, Burgess Publishing Company.
McLaren, D.J. (1974) The anterior glands of adult Necator americanus. 1. Ultrastructural studies. International Journal for Parasitology 4, 2537.
Mehlhorn, H. (1988) Parasitology in focus. Facts and trends. Berlin, Springer-Verlag.
Mobarak, M.S. (1995) Ultrastructural and immunological studies of the equine nematode Strongylus vulgaris (Looss 1900). PhD thesis, University College Dublin.
Mobarak, M. & Ryan, M.F. (1998a) An immunohistochemical investigation of the adult stage of the equine parasite Strongylus vulgaris. Journal of Helminthology 72, 159166.
Mobarak, M. & Ryan, M.F. (1998b) Ultrastructure of the buccal capsule of the equine nematode Strongylus vulgaris with special reference to the dorsal gutter. Journal of Helminthology 72, 167177.
Mobarak, M. & Ryan, M.F. (1999) Ultrastructural aspects of feeding and secretion–excretion by the equine parasite Strongylus vulgaris. Journal of Helminthology 73, 147155.
Ogilvie, B.M., Rothwell, T.L.W., Bremner, K.C., Schnitzerling, H.J., Nolan, J. & Keith, R.K. (1973) Acetylcholinesterase secretion by parasitic nematodes. 1. Evidence for secretion of the enzyme by a number of nematode species. International Journal for Parasitology 3, 589598.
Popova, T.I. (1964) Strongyloids of animals and man. Vol. 5. Skrjabin, K.I. (Ed.) 236 pp. Acadamy of Sciences of the USSR. Israel Program for Scientific Translation, xii.
Shepherd, A.M. & Clark, S.A. (1983) Spermatogenesis and sperm structure in some Meloidogyne species (Heteroderoidea, Meloidogynidae) and a comparison with those in some cyst nematodes (Heteroderoidea, Heteroderidae). Revue de Nematologie 6, 1732.
Sundermann, C.A. & Hussey, R.S. (1988) Ultrastructural cytochemistry of secretory granules of oesophageal glands of Meloidogyne incognita. Journal of Nematology 20, 141149.
Talluri, M.V., Pagg, L., Orecchia, P. & Dallai, R. (1986) Fine structure of buccal cavity and oesophagus in Toxocara canis (Nematoda, Ascarididae) infective larvae. Journal of Ultrastructural and Molecular Structure Research 97, 144157.
Weber, P. (1987) The fine structure of the female reproductive tract of adult Loa loa. International Journal for Parasitology 17, 927934.
Weise, R.W. (1977) A light and electron microscopic study of the dorsal buccal lancet of Haemonchus contortus. Journal of Parasitology 63, 854857.
Wilfred, M. & Lee, D.L. (1981) Obervations on the buccal capsule and associated glands of the adult Bunostomum trigonocephalum (Nematoda). International Journal for Parasitology 11, 485492.
Wright, E.J. & Sommerville, R.I. (1984) Postinsemination changes in the amoeboid sperm of a nematode Nippostrongylus brasiliensis. Gamete Research 10, 397413.

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

  • M.S. Mobarak (a1) and M.F. Ryan (a1)

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