Muñoz M, Muñoz A, Marin O, González A
Departamento de Biología Celular, Facultad de Biología, Universidad Complutense de Madrid, Spain.
Eur J Morphol. 1994 Aug;32(2-4):288-92.
The trigeminal primary afferents and the projections from the sensory trigeminal nuclei were studied in a frog (Rana ridibunda) by means of tract-tracing techniques. Primary fibers from separate ophthalmic, maxillary and mandibular trigeminal branches form short ascending and long descending tracts. Ascending fibers innervate the principal trigeminal nucleus, a field just dorsal to the trigeminal motor nucleus, and the supratrigeminal nucleus. Descending fibers terminate separately in the descending trigeminal nucleus, depending on their branch of origin. Other primary targets are the rhombencephalic reticular nuclei, the ventral and caudal octaval nuclei, the nucleus of the solitary tract and the spinal cord. Ipsilateral intranuclear connections are accompanied by extratrigeminal projections that reach, among others, the thalamus, the mesencephalic tectum and the cerebellum. It is concluded that many amniotic features are shared by the anuran trigeminal system.
利用示踪技术，对一只食用蛙（泽蛙）的三叉神经初级传入纤维和感觉三叉神经核的投射进行了研究。来自三叉神经眼支、上颌支和下颌支的初级纤维分别形成短的升支和长的降支。升支纤维支配主要三叉神经核（位于三叉神经运动核背侧的一个区域）和三叉上核。降支纤维根据其起源分支分别终止于三叉神经降核。其他主要靶区包括后脑网状核、腹侧和尾侧听神经核、孤束核和脊髓。同侧核内连接伴有三叉神经外投射，这些投射到达丘脑、中脑顶盖和小脑等部位。研究得出结论，无尾两栖类的三叉神经系统具有许多羊膜动物的特征。
