Jul 1, 1977

The embryonic development of theproctodeal gland of Coturnix coturnix japonica (Aves)

The Anatomical Record
L R Schafersman, R D Klemm

Abstract

The embryogenesis of the proctodeal gland and development of the connective tissue of the associated lamina propria in the dorsal wall of the proctodeum of Common Coturnix (Coturnix c. japonica) were studied on embryos collected at 12-hour intervals from day 7 of incubation through hatching. Gland development began at 9.5 days from ectodermal-derived epithelial buds developing in the craniolateral region of the dorsal proctodeal epithelium. At 11 days, the epithelial buds had become solid convoluted epithelial cords which, by 11.5 days branced to form solid individual glandular units. Lumina of the unit were formed by degeneration and vacuolization of the central cells of these solid units. Squamous epithelial caps, several layers thick, separated the vacuolizing units from the proctodeal cavity at day 13; these caps subsequently thinned, bulged into the proctodeal cavity and, by day 16, began to disappear opening the lumen of the units to the proctodeal cavity. Sequential formation of epithelial buds, by region, was: craniolateral at 9.5 days, craniomedial expansion at 10.5 days followed, beginning at 11 days, by caudal expansion along entire dorsal proctodeal wall. Sequence of appearance of gland-associated connective tissue ...Continue Reading

Mentioned in this Paper

Embryo
Cryptomeria japonica
Coptis japonica
Cercopithifilaria japonica
Abnormal Degeneration
Coryne japonica
Cryptoplax japonica
Chimaphila japonica
Entire Lumen of Body System
Cobanocythere japonica

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