the canal extending through the petrous portion of the temporal bone, through which the glossopharyngeal nerve, the facial nerve, and the auditory nerve and artery pass.
- Internal capsule
internal capsule n. A layer of white matter separating the caudate nucleus and thalamus from the lentiform nucleus and serving as the major route by which the cerebral cortex is connected with the brainstem and the spinal cord.
- Internal carotid nerve
internal carotid nerve n. A sympathetic nerve extending upward from the superior cervical ganglion along the internal carotid artery, forming the internal carotid plexus.
- Internal carotid plexus
internal carotid plexus n. An autonomic plexus that surrounds the internal carotid artery in the carotid canal and in the cavernous sinus and sends branches to the tympanic plexus, sphenopalatine ganglion, abducens and oculomotor nerves, the cerebral vessels, and the ciliary ganglion.
- Internal cerebral vein
internal cerebral vein n. Either of two paired veins that pass caudally near the midline in the choroid tela of the third ventricle and unite to form the great cerebral vein.