10-Title: Histomorphological studies on the thyroid gland of dromedary camel (Camelus dromedarius)

Authors: Devendra Singh and Sanjeev Joshi

Source: Ruminant Science (2021)-10(2):293-302.

How to cite this manuscript: Singh Devendra and Joshi Sanjeev (2021). Histomorphological studies on the thyroid gland of dromedary camel (Camelus dromedarius). Ruminant Science 10(2):293-302.

Abstract

The present study aims to highlight the histomorphological features of the thyroid gland in camels. Thyroid glands were collected from naturally died sixteen camels (n=16) of both sexes from the Veterinary Clinical Complex of the college. The thyroid gland was encapsulated by a thin capsule of collagenous connective tissue, with reticular fibres, few elastic fibres and some fibroblasts. The trabeculae were fibrous connective tissue strands that emerged from the capsule and travelled into the parenchyma towards the centre and divided the gland into lobules. Thyroid follicles varied in size and shape, usually round to oval, but a varying number of irregular follicles were also found. The follicles were lined by cells varying from cuboidal to low columnar epithelium, had spherical to oval nuclei, which occupied a greater proportion of cell cytoplasm. The parafollicular cells or “C” cells were found among the follicular cells and between the interfollicular connective tissue. The quantity of the colloid in follicles was variable according to their activity. The solid cell nests  (SCNs) were composed of solid nests of polygonal or elongated cells with abundant cytoplasm. There were a few follicles and lobules in the isthmus. It can be concluded that the histomorphological anatomy of the thyroid gland resembles to other domestic and wild animals discussed in the manuscript with few anatomical variations.

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