Lecture 11: Caudal Pons and Upper Medulla Flashcards
Name the 3 nuclei that give rise to parasympathetic fibers?
edgier-wesphal (CNIII) superior and inferior salivary and lacrimal nucleus (CN VII and IX) and the dorsal motor of the vagus (CNX) (CN 3, 7,9,10)
Which nuclei and nerve supply the salivary glands?
submandibular and sublingual served by the superior salivatory gland via CN VII; parotid is served by the inferior salivatory nucleus via CN IX
Where does the superior salivatory nucleus synapse on its way to the submandibular and lingual glands?
submandibular ganglion (exits lateral caudal pons)
Where does the lacrimal nucleus synapse on its way to the lacrimal gland?
pterygo-palatine ganglion (exits lateral caudal pons)
Where is the inferior salivatory nucleus?
posterior to the inferior olive in the rostral medulla, exits laterally and synapses in the otic ganglion to the parotid gland
Where is the dorsal motor X nucleus located?
right along the border of the 4th ventricle in the rostral medulla
Distinguish the rostral and caudal parts of the solitary nucleus.
rostral deals with taste and caudal deals with chemoreceptors of the viscera (blood composition)
What type of fibers are contained in the rostral solitary nucleus and where do they go?
visceral sensory via CNVII to ant ⅔ tongue, CNIX to post ⅓ of tongue and CNX to the epiglottis
What types of fibers are found in the caudal solitary nucleus?
visceral sensory via CX to stretch baroreceptors and chemo receptors in the aortic arch
Describe the ascending pathway of the rostral solitary nucleus.
taste receptors send fibers via the solitariothalamic tract ipsilaterally to the VPM and onward to the cortex
Describe the pathways of the caudal solitary nucleus.
leaves the aortic body receptors and follows CN X to synapse on the caudal tracts and inhibitory neurons before continuing on upward towards the caudal nucleus solitarius
