Morphological and Histochemical Study of Jejunum and Ilium in Post Hatching of (Columba Livia) and Adult

These results found differences in the jejunum and ilium of post hatching and adult Columba Livia in terms of morphological and histochemical aspects. the jejunum is longest part of small intestine and it was cone shape, it is starting at the proximal end of ascending duodenum to the ileum, it was consisted of centripetal, centrifugal coli and central flexure called spiral loop and suspended by mesentery called mesojejunum. It reddish- brown color. the ileum is third and short part of small intestine reddish color and it is continuing with jejunum to the end of ileo-cecal junction. Histological, the jejunum and ilium was consisting of four layer mucosa, sub-mucosa, muscularis, serosa. The tunica mucosa consisted from of villi, lamina propria and muscularis mucosa, the villi was finger like and not-branched, each villus was covered by simple columnar epithelium with goblet cells. The crypt of lieberkuhn also called intestinal gland were located in the basal of each villus. The thickness of tunica mucosa of jejunum in post and adult was high at level P˂0.05 vs thickness of tunica mucosa of ilium in post and adult. The tunica sub-mucosa was thin layer that form connective tissue and collagen fiber. The tunica muscularis was thick layer made from inner circular layer and outer longitudinal layer, the thickness of muscular of jejunum in post was high at level P˂0.05 vs adult. While the thickness of ilium in adult was high at the level P˂0.05 Vs post hatching. The serosa layer was thin of simple epithelium layer which contain blood vessels, nerve and adipose tissue.