胎儿食管神经支配特点的光、电镜观察

取死亡胎儿食管10个,各等分为上、中、下3段,对各段食管神经支配特点进行光镜和透射电镜观察。发现肌间神经丛从上段食管中下部开始出现,支配上段食管骨骼肌的神经纤维终末呈斑状膨大;支配中、下段食管平滑肌的神经纤维行程中形成大量膨体,神经终末呈点状膨大;肌间神经丛内亦可见到许多神经纤维形成的串珠状膨体结构。电镜观察神经节是由神经细胞和神经胶质细胞以及它们的突起组成的实体,在神经节内还可见到含有不同类型突触小泡的神经终末及膨体。另外,还可见到平滑肌纤维间的神经终末及膨体,其与周围组织并不密接。

Observation on the characteristics of fetal esophagus innervation with light and electron microscopes

Each of the esophagi from 10 dead feti,was divided into 3 equal seg- ments: upper, middle and lower,and the characteristics of innervation of each segment were studied with light and transmission electron microscopes. The findings were;intermuscular nerve plexus began to ower part of the upper esophagus;the nerve fiber endings innervating the skeletal asc es of the upper esophagus showed macular enlargement; the nerve fibers innervating the smooth muscles of the middle and lower esophagus formed a large amount of enlargement in their course with nerve endings showing punctulate enlargement; there were many nerve fibers forming beaded structures of enlargement in intermuscular nerve plexuses. Under electron microscope the ganglia was a substance composed of nerve cells,neurogliaocytes and their processes;in the ganglia,there were nerve endings and enlargement with various types of synaptic vesicles;in addition,nerve endings and enlargement also occurred among the smooth muscle fibers. Observations showed no contact between the enlargement, nerve endings and surrounding tissues.