白胸苦恶鸟消化管的组织学观察

采用石蜡切片技术对白胸苦恶鸟(Amaurornis phoenicurus)的消化道进行了组织学观察.结果表明,食管皱襞发达,黏膜上皮为复层扁平上皮,食管腺发达,颈段多于胸段,黏膜肌层为一层纵肌,厚约0.06 ～0.26 mm.肌层为一层厚约0.19～0.27mm的环肌.腺胃被覆单层柱状上皮,固有层内有单管腺和复管腺两种腺体,单管腺仅深约0.11 ～0.20 mm；复管腺厚约1.19～1.26 mm,占管壁的77.8％ ～80.4％.肌胃的类角质层发达,厚约0.16～0.24 mm.肌胃腺呈管状,与类角质层突起形成皱襞.肌层发达,由内环外纵两层平滑肌构成.肠绒毛无分支和中央乳糜管,十二指肠绒毛长而密集,空肠绒毛呈细长指状,直肠绒毛长且呈叶状.十二指肠与直肠肠绒毛内有大量致密淋巴小结,盲肠绒毛短,肠腺少.

Histological Observation on the Digestive Tract of White-breasted Waterhen

The histological structures of digestive tracts of White-breasted Waterhen (Amaurornis phoenicurus) have been studied by light microscopy. The plicae in the esophagus are developed and the wall of the esophagus is lined by stratified squamous epithelium. The lamina muscularis mucosa is a layer of longitudinal muscle of 0.06-0.26 mm thick, while the tunica muscularis is a layer of circular muscle of 0.19-0.27 mm thick. The number of the esophagus glands in the cervical segment is more than that in the thoracic segment. The wall of the glandular stomach is lined by simple columnar epithelium. There are two kinds of gastric glands in the tunica propria. The simple tubular glands are 0.11-0.20 mm long. And the compound tubular glands are 1.19-1.26 mm thick, accounting for 77.8%-80.4% of the wall of the glandular stomach. The koilin in the surface of the muscular stomach is developed and 0.16-0.24 mm thick. The simple tubular glands in the tunica propria and the koilin form the poicae. The muscular layer is composed of interior circular muscle and outer longitudinal muscle. The villi in the intestine are not branched and have no central lacteal. The villi in the duodenum and rectum are long and dense and those in the jejunum are fingerlike. There are some dense lymphoid nodules in the villi of the duodenum and rectum. The villi in the cecum are short and the glands are few.