![]() ![]() Preganglionic parasympathetic motor neurons ( third-order ): efferent limb arises from Edinger-Westphal nucleus → oculomotor nerve ( CN III) → ciliary ganglion.Internuncial neurons ( second-order ): Fibers from each pretectal nucleus innervate both the ipsilateral and contralateral Edinger-Westphal nuclei.Fibers from the nasal half of the retina crossover → contralateral optic tract → contralateral pretectal nucleus.Fibers from the temporal half of the retina → ipsilateral optic tract → ipsilateral pretectal nucleus in the midbrain.Impulses from the retina travel in the afferent optic nerve ( CN II ) to the optic chiasm.Retinal ganglion cell neurons ( first-order).Indirect pupillary reflex ( consensual pupillary reflex): constriction of the pupil in response to illumination of the contralateral eye. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |