الفهرس | Only 14 pages are availabe for public view |
Abstract The total length of both ceca in male goose was about 338.46 mm. It represented 16.51% of the total intestinal length. While their weight recorded 4.89 gm. It formed 10.35% of total intestinal weight. - Asymmetry in the length and weight of each cecum was observed. The right cecum was longer and heavier than the left one. - The total diameter of each cecum indicated that the cecum was narrower at the base than the remaining parts. The luminal diameter of each cecum was the widest at the level of the apex then decreased caudal wards. A reverse correlation was observed in the wall thickness. - The mean length of the colon was about 85.51 mm which represented 4.17% of the total intestinal length. While its weight was about 3.93 gm that constituted 8.32% of total intestinal weight. - The base of the cecum had the highest villi which took different shapes with well-developed lymph space filled most of the core of the villi, the body had short finger like villi with moderate sized lymph space and the apex had folds with small lymph space. - The lining epithelium of the mucosa showed different staining affinities, where there were dark and light cells. The microvilli of the dark cells were short and numerous while that of the light cells were long and few in number. - The mitochondria were seen throughout the cytoplasm from the top to the base of the cells. The mitochondria of light cell were arranged in groups or clusters but those of the dark cell were scattered diffusely in the basal part. Discussion 318 - The goblet cells were numerous in number in the base of the cecum, but decreased in number towards the apex. They showed PAS and Alcian blue positive reactions as they have neutral and acid mucopolysaccharides secretions. - The apical and basal parts of the lining columnar epithelial cells of the mucosa, crypts and submucosal glands of the cecum and colon reacted positively to bromophenol blue stain. - The apical part of the epithelium, lamina propria and part of the submucosal glands revealed positive reaction to ATPase histochemical stain. - The rodlet cells from transitional to rupture stages were demonstrated in the large intestine. According to the present electron microscopic observations, the prerupture and rupture stages were observed within the epithelium while the transitional stage was demonstrated within the lamina propria. - The enteroendocrine cells (closed type) were detected in the epithelium, lamina propria and submucosal glands by light microscopic investigation using Silver stain and in semithin section using Toluidine blue stain. - The telocytes were identified in various areas of the cecum and colon. These cells were observed in the subepithelial lamina propria, submucosa, around blood and lymph vessels, around cecal glands, in contact to the nerves and in muscular layer. - The muscularis mucosa was formed of circularly arranged smooth muscle fibers towards the side of the submucosa. It gave smooth muscle strands extending within the core of the villi. Discussion 319 - Diffused lymphocytes were located within the epithelium, lamina propria and submucosa. The lymphoid follicles were distributed along the cecum, but they became aggregated and well developed at the base of the cecum forming the cecal tonsils. - The muscular layer composed of dark muscle fibers interrupted by light ones and characterized by elastic fibers. At the level of the iliocecocolic junction, the muscular layer formed of three layers in addition a thickened layer of oblique smooth muscle fibers positioned between the middle circular and outer longitudinalsmooth muscle layers. |