Prenatal Study of the Developing Omasal Laminae in Goat

Abstract

The study was conducted on developing omasum from 36 healthy and normal embryos/ foeti of Indian
goat. Embryos/foeti were assigned into three groups (0-50, 51-100 and 101-150 days of gestation).
Internal surface of the omasum showed leaf like omasal laminae from 38 days of gestation. Primary,
secondary, tertiary and quaternary laminae were observed grossly on 38, 51, 55 and 87 days and
histologically at 38, 46, 51 and 70 days of gestation, respectively. The free border of the laminae showed
serration at 94 days in primary and 100 days of gestation in secondary and tertiary laminae. Quarternary
laminae were devoid of serrations. Under light microscope the first sign of omasal laminae formation
was evidenced by evagination of basal zone of epithelium laid to formation of undulations towards the
omasal lumen. Height of the laminae and interlaminar space between laminae were increased with
advancement of gestation. Lateral outpocketing of omasal laminae was first noticed at 51, 60 and 87 days
of gestation in primary, secondary and tertiary laminae, respectively referred as corial papillae.