鸡胚咽囊发生的扫描电镜观察

OBSERVATION OF PHARYNGEAL POUCH DEVELOPMENT IN CHICK EMBRYO WITH SEM

目的：了解咽囊发生和衍变过程中的基本规律，探讨内、外胚层与间充质在咽囊发生过程中的相互关系和作用。方法：通过显微解剖术和扫描电子显微镜直接地系统观察早期鸡胚（Ｓｔａｇｅ１０～２０）的咽和咽囊。结果：咽壁内胚层的生长、弓动脉发育并隆入咽内，是咽囊发生的主要原因；鳃裂的形成与内、外胚层生长融合有关；间充质继发性增生填充，参与形成相应的鳃弓。

Objective:In order to understand the development of the pharynx and probe the impact and the correlation between the ectoderm、the endoderm and mesenchyma on the development of the pharynx Methods: The pharynx and pharyngeal pouch in chick embryo (Stage 10￣20) were directly observated under SEM with microdissection Results: The main reasons for the development of pharyngeal pouch are the growth of endoderm in pharyngeal, and development arch artery which projected into the pharnynx The formation of branchial cleft is related with the confusion in the growth of ectoderm and endoderm The formation of related branchial arch resulted from uneven growth in endoderm and ectoderm, and following the development of mesenchyma which filled the area between the endoderm and ectoderm Conclusion: The main reasons for the development of pharyngeal pouch are the result from uneven growth of the epithelial tissves in the embryo