高山兀鹫的食管组织学观察

应用大体解剖技术、H.E染色法,观察了高山兀鹫食管组织学结构并与家禽和哺乳动物的食管比较。结果表明:高山兀鹫的食管上段皱襞很少,而下段则形成很多皱襞;食管黏膜上皮为复层扁平上皮,角质化明显;黏膜肌层由分散的平滑肌束构成;食管上段黏膜下层内食管腺丰富,而下段食管腺很少;食管肌层分为两层:纵肌和环肌,食管下段比上段的肌层发达;食管外膜是一层薄的纤维层,内含血管、神经。

Histological Observation on Esophagus of Gyps himalayensis

The histological structure of the esophagus of Gyps himalayensis was observed and analyzed by using gross anatomy technology and routine paraffin sections stained with H.E,and then was compared with that of the esophagus of the poultry and the mammalian.The results showed that there were few plicas in the upper esophagus of Gyps himalayensis,while plenty of plicas in the lower esophagus.The mucosa epithelium was stratified squamous epithelium,and surface epithelium was obviously keratinized;the muscularis mucosa was made up of scattered smooth muscle bundles;it had numerous esophageal glands in the submucosa of the upper esophagus,but very few in the lower esophagus;the muscularis were made up of two parts: circular smooth muscle layer and longitudinal smooth muscle layer.The muscle of the lower esophagus was more developedly than that of the upper esophagus.The adventitia was a lamina fibrosa,in which there were a lot of blood vessels and nerves.