Indian Journal of Animal Research

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Indian Journal of Animal Research, volume 43 issue 4 (december 2009) : 241-245

HISTOGENESIS OF DIENCEPHALON IN GOAT FOETUSES*

K.M. Lucy, K.R. Harshan, J.J. Chungath, N. Ashok1
1Department of Veterinary Anatomy and Histology, College of Veterinary and Animal Sciences, Mannuthy-680 651, India.

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Cite article:- Lucy K.M., Harshan K.R., Chungath J.J., Ashok1 N. (2024). HISTOGENESIS OF DIENCEPHALON IN GOAT FOETUSES*. Indian Journal of Animal Research. 43(4): 241-245. doi: .

ABSTRACT

Histogenesis of diencephalon was studied using 46 goat foetuses ranging from 2.5 cm CRL
(40 days of gestation) to 41.5 cm CRL (full term). By 40 days, the roof plate was converted into
the tela choroidea and along with the growing blood vessels, formed the choroid plexus of the
third ventricle. Proliferation of neuroblasts in localized regions of the mantle layer led to formation
of nuclei in the seventh week. The nerve tracts also appeared at this stage. At 81 days the
internal medullary lamina extended into the thalamus from the stratum zonale dividing it into
medial and lateral portions. Supraoptic nucleus started developing towards the end of second
month. Typical neurons appeared in most of the thalamic and hypothalamic nuclei during fourth
month. During fifth month, supraoptic and paraventricular nuclei of hypothalamus showed bipolar
cells. Histologically the diencephalon was adult-like towards term.

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