cranial nerves 3 Flashcards
what are the parts of the sensory trigeminal nuclear complex and their modality
mesencephalic - proprioception
pontine - light touch and vibration
nucleus of spinal tract of trigeminal - pain and temperature
what nerves go into the STNC and where
trigeminal - into the pontine and the mesencephalic and spinal tract of trigeminal
facial - pontine
glossopharyngeal - pontine
vagus cr11 - spinal tract of trigeminal
cell bodies of sensory neurons for the mesencephalic part of the STNC are in the mesencephalic part - significance
the cell bodies of the other sensory neurons that synapse to the STNC are in ganglia. but some sensory parts of trigeminal go into the mesencephalic part having the cell body there. this is so the synapse can then occur in the motor nucleus of trigeminal so that we can have reflex mastication. so we chew as a reflex pattern
tell me about the VTTT
this carries the sensory information from the STNC and essentially forms the H part of the somatotopy of the medial lemniscus in the brainstem.
it is from the fibres crossing over and ascending in the medial lemniscus - not the same thing but you cant tell them apart. VTTT carries all sensory modalities whereas the medial lemniscus is just the touch and vibration remember.
what comes out of the superior salivatory nucleus, where it go, what it do
the glossopharyngeal nerve comes from here, it goes to the parotid gland. has innervations from NOTS to have salivation reflex when we taste
what comes out of the inferior salivatory nucleus, where it go and what it do, reflexes
via the facial nerve to the submandibular and sublingual glands. also has reflexes from the NOTS to have salivation when we eat.
the nucleus ambiguus has bilateral innervations why and what does this mean
the nerves coming from the nucleus ambiguus are responsible for critical functions of swallowing and breathing. so UMN does bilateral innervation.
this means we dont lose function with LMN lesion but we can have some hoarseness to our voice and dysphagia
what does the glossopharyngeal nerve carry out of the nucleus ambiguus
carries motor function to the stylopharyngeus
what does the vagus nerve carry out of the nucleus ambiguus
X and CrXI carry motor function to the levator palatini, muscles of pharynx and larynx, striated muscles of the oesophagus and preganglionics of the heart
what do the nerves coming from the dorsal motor X nucleus do
this is the vagus nerve The postganglionics from the vagus go to plexuses of the alimentary canal, the pancreas, the stomach gastric glands, the lungs bronchial smooth muscle.
the vagus nerve is mostly reflexive function, why is that
inputs come from the nucleus of tractus solitarius. that nucleus has most of the visceral sensation of the body from vagus sesnroy fibres. so it feeds back to this nucleus to aid the vagus function of things like the GI tract stuff
nucleus of tractus solitarius has taste come into it from where and from who
anterior 2/3 of the tongue by facial nerve via the chordae tympani nerve
posterior 1/3 glossopharyngeal
epiglottis is by the vagus and Cr11
for the nerves carrying taste, where are their cell bodies
facial nerve has cell body in the geniculate ganglion
glossopharyngeal in the inferior glossopharyngeal ganglion
vagus nerve in the inferior vagal ganglion
how is taste sensation conserved
taste sesnation is very important so via the secondary neurons from the nucleus of solitary tract go to both VPL of the thalamus to both insular cotices to conserve taste function
what general visceral sensation does the facial nerve have in the NOTS
none
what general visceral sensation does the glossopharyngeal nerve have in the NOTS
Glossopharyngeal has baroreceptors in the carotid sinus and chemoreceptors in the carotid body
what general visceral sensation does the vagus Cr11 have in the NOTS
Vagus and cranial root 11 has baroreceptors In the aortic arch, chemoreceptors in the aortic body, lung stretch receptors, mucus membrane receptors in airways, gut stretch receptors and gut chemoreceptors.
