On morphology and histology of the digestive tract in young Eleutheronema rhadinum

The morphology and histology of the digestive tract in young Eleutheronema rhadinum were observed by optical micro-scopes.The digestive tract was composed of orol-pharyngeal cavity,esophagus,stomach,pcyloric caeca and intestines.The orol-pharyngeal cavity was large,and there were villiform molars on the jaw teeth,palate teeth and vomerine teeth.The mucosa of esophagus was covered with stratified squamous epithelium with many mucous cells.The Y-shaped stomach consisited of cardia,blind sac and pylorus.The stomach had a single-layered columnar epithelium,in the lamina propria of cardia and blind sac,enormous stomach glands were present,while no goblet cells was detected in the whole stomach.Intestines were Z-shaped,including foregut,midgut and hindgut,and the average intestinal coefficient was about 0.583.The intestine epithelium was composed of simple columnar cells with a distinct microvillus brush border in which there were many goblet cells,while intestinal gland was not detected in intestines.The low-high-low tendency was found in the mucosal thickness and width from front to back,whereas the muscularis was in the contrary condition.Pcyloric caeca was like cauliflower,the histological characters were similar to that of the intestines,but no goblet cells was found in the epithelium.