Histological Study of the Digestive Tract of Liza abu (Heckel) II Stomach

Abstract

  The study current included histological structure of stomach of Liza abu , anatomical results found that stomach represent the expander non-convoluted part of gastrointestinal tract it is located between the end of the esophagus and the beginning of the intestine , the average length of stomach was (1.5) cm , composed of two parts : cardiac stomach which is represent the anterior part and be thin- walled , the other part was pyloric stomach or gizzard and the walls were thick . The internal surface of cardiac and pyloric stomach contain longitudinal folds numbering (7), folds branching to finger shape structures extend inside the lumen . Histological study showed that stomach wall composed of three main histological layers : mucosa , sub mucosa , muscularis and externa serosa , the epithelial tissue that lining stomach was simple columnar with thickness of (15)μ and (13)μ. In cardiac and pyloric stomach respectively. Lamina propria of cardiac stomach contain  tubular gastric glands , pyloric part do not contain gastric glands at all sub mucosa was dense connective tissue extend from mucosa to muscularis externa with thickness of (49)μ and (84)μ in cardiac and pyloric stomach respectively. Layer with muscularis externa composed of smooth muscle fibers arranged in two layers : internal circular thickness of (288.7)μ and (1666)μ in cardiac and pyloric stomach respectively and external longitudinal layer with thickness of (157.5)μ and (31)μ. In cardiac and pyloric stomach, serosa was a thin layer of loose connective tissue surrounding by squamous epithelial cells with a thicknessof  (10.5)μ .