Surface Ultrastructure of Ultimobranchial Epithelium in the Thyroid Gland of Donkey (Equus asinus)
Identifieur interne : 000E29 ( Main/Exploration ); précédent : 000E28; suivant : 000E30Surface Ultrastructure of Ultimobranchial Epithelium in the Thyroid Gland of Donkey (Equus asinus)
Auteurs : R. Sayed ; W. Mubarak [Égypte] ; A. M. SalehSource :
- Anatomia, Histologia, Embryologia [ 0340-2096 ] ; 2005-12.
Abstract
Surface ultrastructural observation of the thyroid gland in donkey revealed the coexistence of certain unusual follicles or cysts, the ultimobranchial (UB) follicles, which exhibited large diameters and less regular outlines. In addition, several small follicles, cell nests or solid cellular masses were also demonstrated in association with these structures. Surface of most UB follicular cells was almost hexagonal in shape, studded with sparse or dense pleomorphic microvilli, which were much denser at the cellular borders. Each follicular cell bore single cilium that projecting over the cell surface. Interestingly, bleb‐like apocrine protrusion of the apical cytoplasm of some follicular cells was frequently demonstrated. These apocrine blebs (or aposomes) were varied in shape, size and showed smooth or irregular surface. In addition to such aposomes, deep to shallow circumscribed or eroded areas of the apical cell surface was frequently demonstrated. These findings indicate that the UB follicular cells in donkeys, similar to those of camels, exhibit an apocrine activity alongside with the usual merocrine mode of secretion.
Url:
- https://api.istex.fr/document/4BAF031B0DFDCF62DBABA499E69015439C884E80/fulltext/pdf
- https://api.istex.fr/document/8F1827B910B00D6E4B7C2046AA7510E3B0F5CF07/fulltext/pdf
DOI: 10.1111/j.1439-0264.2005.00669_104.x
Affiliations:
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Le document en format XML
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<front><div type="abstract" xml:lang="en">Surface ultrastructural observation of the thyroid gland in donkey revealed the coexistence of certain unusual follicles or cysts, the ultimobranchial (UB) follicles, which exhibited large diameters and less regular outlines. In addition, several small follicles, cell nests or solid cellular masses were also demonstrated in association with these structures. Surface of most UB follicular cells was almost hexagonal in shape, studded with sparse or dense pleomorphic microvilli, which were much denser at the cellular borders. Each follicular cell bore single cilium that projecting over the cell surface. Interestingly, bleb‐like apocrine protrusion of the apical cytoplasm of some follicular cells was frequently demonstrated. These apocrine blebs (or aposomes) were varied in shape, size and showed smooth or irregular surface. In addition to such aposomes, deep to shallow circumscribed or eroded areas of the apical cell surface was frequently demonstrated. These findings indicate that the UB follicular cells in donkeys, similar to those of camels, exhibit an apocrine activity alongside with the usual merocrine mode of secretion.</div>
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