Indian Journal of Animal Research

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Indian Journal of Animal Research, volume 43 issue 1 (march 2009) : 7-11

EARLY HISTOMORPHOGENESIS OF METENCEPHALON IN GOATS*

K.M. Lucy, K.R. Harshan1, J.J. Chungath, N. Ashok2
1Department of Veterinary Anatomy and Histology, College of Veterinary and Animal Sciences, Mannuthy-680 651, Thrissur, India

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Cite article:- Lucy K.M., Harshan1 K.R., Chungath J.J., Ashok2 N. (2025). EARLY HISTOMORPHOGENESIS OF METENCEPHALON IN GOATS*. Indian Journal of Animal Research. 43(1): 7-11. doi: .

ABSTRACT

Early development of the metencephalon was studied using six goat foetuses up to one month of
gestation. By 24 days of age (1.4cm CRL), the neural tube was completely fused and the brain
vesicles started developing. The metencephalon was distinguished from the more posterior
myelencephalon by its much thicker roof and by the presence of the isthmus and the pontine flexure.
It was circular in cross section and distinct basal and alar plates representing the motor and sensory
areas were found on each side of the midline and were united by the floor and roof plates, respectively.
A prominent sulcus limitans divided the alar and basal laminae. The walls bore the prominent scalloping
of neuromeres. Near the beginning of the hindbrain were the large semilunar ganglia. Junction
between metencephalon and myelencephalon was demarcated by the sharply defined otocyst. All
the metencephalic parameters showed a significant positive correlation with the parameters of the
other brain vesicles. Histologically, wall of the metencephalon showed an inner ependymal, middle
mantle and outer marginal layers bounded by the inner and outer limiting membranes

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