HISTOLOGY AND HISTOCHEMISTRY OF THE ENDOCRINE ORGANS OF THE INDIAN DONKEY (Equus as in us)
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Date
2001
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University of Agricultural Science, Dharwad
Abstract
"The present study on the histology and histochemistry of the endocrine
organs viz. pineal , Pituitary , thyroid , parathyroid and adrenal gland in the
young and adult Indian donkey to know the cytoarchitecture and histochemical
characterstics of the cells with their location and functional status.
The gross morphological studies revealed the location and position of
various endocrine organs in the Indian donkey.
Histologically, the pineal gland consisted of pinealocytes, me lanocytes
and glial cells in the parenchyma. Th e presence of two types of pinealoc ytes
indicate the functional status of the gland. The pituitary gland consisted of
a d e n oh yp op h y sis and neurohypophys is. The a d e n o h yp o p h y s is consisted of
acidophils, basophils and ch romo p h o be s . Neu ro hyp o ph y s is consisted of
pituicytes and neuroglial cells. Herring bodies were noticed in the n ear blood
vessels. Thyroid gland mainly consisted of small, me d ium and large follicle Vi/ith
blood vessels and parafollicular cells. The presence of small follicles were more
in n umb e r and lineu by cuboidal epithelium in young donkey. Large follicles lined
by tlat epithelium with loss or no colloid indicatGd ttu? aclivily of the gland.
Parathyroid gland consisted, oxyphil,two types pf cliie f cells and parafollicular
cells. Th e adrenal gland was consisted of outer cortex, middle g a nglionic and
medulla. Epinephrine and norepinephrine cells were noticed in the niedulla.
Histochemically. Histochemically the pinealocytes of the pineal, basophils and
neurosecretory substances (Herring bodies) o f pituitary, colloid o f tlie thyroid,
chief cells and oxyphil cells of parathyroid and zona arcuata and zona reticularis
of adrenal gland showed PAS positive reaction.
Pinealocytes of pineal, basophils of pituitary, follicular epithelium and
colloid o f follicles, chief cells o f parathyroid and ganglionic cells o f the adrenal
gland were alcian blue (pH 2.5) positive.
No significant difference in the histology and histochemistry between
young and adult Indian donkey endocrine glands except pineal and thyroid
gland."
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