• 作者： 洪玉海; 張丙龍
• 作者服務機構： 國立臺灣大學醫學院解剖科
• 中文摘要： 在二天齡的倉鼠頸上神經節內，大多數的神經細胞尚未成熟稱為原始交感神經細胞。它們的形狀小，2或3個細胞靠近而成為很多細胞群。每個細胞群的周圍由衛星細胞的細胞質所包圍。在這些原始細胞內只有線粒體，顆粒內質網及高氏器等比較發達而其他的細胞器官則不發達。在神經節內可見軸突－胞質突觸 (axo-somatic synapse) ，並可見很多休旺氏細胞的細胞質所包圍的無髓鞘神經纖維。 在九天齡的倉鼠頸上神經節內可發現很多神經細胞正在發生有絲分裂因而增加神經細胞的數量，同時也增加它們的大小而成為年輕交感神經細胞。在十天齡的倉鼠，每個年輕神經細胞都完全被衛星細胞的細胞質所包圍。細胞器官的數量也相當地增加。軸突－胞質突觸及軸突－樹突突觸都可見於十天齡倉鼠的神經節內。 在三十天齡的倉鼠頸上神經節內，其年輕神經細胞內的各種細胞器官很發達，其發育程度已達到與成體倉鼠神經節內的成熟神經細胞者同樣的程度。
• 英文摘要： An electron microscopic observation has been made on the superior cervical ganglia of 2-day-oldhamsters, in which most nerve cells were still immature and were named as primitive sympathetic nervecells. They were small in size and 2 or 3 cells were grouped together to become many cell clusters. Onlythe periphery of each cell cluster was enclosed by the satellite cell cytoplasm. In these primitive nerve cells,only mitochondria, granular endoplasmic reticulum and Golgi apparatus were relatively prominent and theother cytoplasmic organelles were poorly developed. Axo-somatic synapses were found in the ganglia.Many unmyelinated nerve fibers were present in the ganglia. These nerve fibers were surrounded by theSchwann cell cytoplasm. Active mitotic divisions of the nerve cells were found in the superior cervical ganglia of 9-day-oldhamsters and resulted in an increase in the number of nerve cells. The size of the nerve cells also increasedand became young sympathetic nerve cells. In the 10-day-old hamsters, each young nerve cell was entirelyenclosed by the satellite cell cytoplasm. The number of cytoplasmic organelles was increased considerably.Axo-somatic and axo-dendritic synapses were also observed in the ganglia of 10-day-old hamsters. The present study revealed that the developed cytoplasmic organelles in the young nerve cells of the30-day-old young hamsters reached the level of the mature nerve cells in the ganglia of the adult hamsters.Multiple desmosomes were detected in the ganglia of both the young and adult hamsters.
• 中文關鍵字： superior cervical ganglia; primitive and young nerve cells; satellite cells; mitotic divisions; Golgi apparatus; synapses.
• 英文關鍵字： --