عنوان المقالة: Histological Study of Small Intestine Development in Local Chicken (Gallus gallus domesticus) and Duck (Anas platyrhynchos domesticus) Embryos
Growth of the avian small intestine initiates during embryogenesis through
simultaneous and compound histogenesis proceedings. The histological study of
the small intestine development in local chicken and duck embryos followed a
protocol of paraffin embedding technique, and the tissues were stained by
Hematoxylin and Eosin stain. The histological study was divided into three age
periods, which showed that the walls of the three parts of the small intestine were
similar with some differences. The first period in chickens showed that the
mucosa had small folds, while the duck had very close folds. The second period
in chickens showed that the villi had equal height and width with an elongated
columnar epithelium and the presence of Paneth cells; tunica muscularis
consisted of two thin muscular layers, the middle circular and outer longitudinal,
interspersed with Auerbachian plexuses and tunica serosa consisted of
mesothelial cells. While in the duck, the folds’ epithelium had a brush border,
interspersed with goblet cells, and the presence of Auerbachian plexuses between
the middle and outer layer of muscularis. At the end of the second period in
chickens, the duodenal mucosa contained finger-shaped villi, while in ducks, the
submucosa contained the Meissner plexuses, which were elongated oval in
chickens and circular in ducks, and there were no Brunner glands in both bird
types. The jejunum’s villi were finger-shaped with equal length but shorter than
the duodenum’s villi, and there were plicae in its wall. The intestinal crypts
formed in two ways: either from undifferentiated embryonic cells or by dividing
the crypt into two by bifurcation. The ileum’s villi were shorter and wider in
chickens, while in ducks, they were hook-shaped, with the presence of Beyer’s
batches. The third period in chicken and duck arrangements an efficient small
intestine by the completion of embryogenesis. In conclusion, this combined
examination offers a roadmap for researchers to estimate varied investigational
data that have gotten at the histogenesis of small intestine growth within the two
bird types.
سفانه خضر محمود | Saffanah Khuder Mahmood | 4199