ACB 8120 Lecture Notes - Lecture 58: Inferior Salivatory Nucleus, Superior Salivary Nucleus, Solitary Nucleus
12 Apr 2020
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Medulla: cn viii, ix, x, xi, xii. ** every m in the head is innervated by sve neurons (voluntary mm derived from ph arches) except eye and tongue. Myelencephalon cn ix, x, xi (nucleus ambiguus) medulla most caudal. Ambiguous because it supplies motor innervation to several different cranial nerves (only motor nucleus to do so). Myelencephalon cn ix (inferior salivatory nucleus), cn x (dorsal nucleus of vagus, goes to thorax) Metencephalon cn vii (geniculate ganglion - chordae tympani) Myelencephalon cn ix, x (solitary tract nucleus) ( glossopharyngeal ganglion, vagal ganglia) Solitary tract nucleus (in medulla, not all the way lateral) receives visceral afferent info from the pharynx, larynx, trunk viscera, carotid body, and carotid sinus. Nucleus mediates many fundamental homeostatic reflexes (cough reflex, baroreceptor reflex, gag reflex) Myelencephalon cn viii (lateral most edge of the medulla) Serve as origins of tracts, relays in pathways, synapse sites, produce nts. Tracts course through the brainstem occupying very specific structures.
