Ascending Sensory Pathways II Flashcards
Branches of trigeminal nerve
V1 - ophthalmic
V2 - maxillary
V3 - mandibular
Ophthalmic exit
Superior orbital fissure
Maxillary exit
Foramen rotundum
Mandibular exit
Foramen ovale
V2 supplies which teeth
Upper teeth (inf. alveolar nerve)
V3 supplies which teeth
Lower teeth (inf. alveolar nerve)
Where does herpes zoster virus lie dormant?
Sensory roots of specific spinal nerves
So which two groups of somaesthetic are there
Essential to survival - pain, temp, some touch and pressure
Detail - discriminative touch, vibration, proprioception
Cranial nerve nucleus is equivalent to what in PNS
DRG
which four cranial nerves are associated with general sensation of head
V
VII
IX
X - conscious sensation
Most is trigeminal (5)
All through trigeminal sensory
Trigeminal supplies what in face
Major carrier of general sensory - face, nose, scalp, dura
Facial supplies what in face
External ear
Glossopharyngeal supplies what in face
Post 1/3rd tongue
Pharynx
Middle ear
Vagus supplies what in face
Auditory canal
Larynx
Pharynx
Oesophagus
Trigeminal nucleus is continous with…
Continuous with mesencephalic nucleus, pontine, spinal nucleus of trigeminal nucleus
Trigeminal nucleus contains which fibres of which cranial nerves
Sensory fibres of
Trigeminal
Facial
Glossopharyngeal
Vagus
Where do the fibres from the trigeminal nucleus go to
The thalamus
Which branch off facial nerve carries taste
Solitary tract branch
Where does the motor nucleus lie relative to chief sensory nucleus
Medial
Which part of sensory nucleus receives pain and temperature
Caudal part of spinal nucleus
Which part of sensory nucleus receives simple touch and pressure
More rostral parts of spinal nucleus
first order neuron cells bodies are in what ganglion
trigeminal ganglion
where is the trigeminal ganglion
sits just next to the foramina which the three branches of the trigeminal pass through
what type of fibres are running through the trigeminal ganglion
Thin, slow fibres
where do the fibres of each respective cranial nerve enter the brain stem
where they normally would based on the cranial nerve in question
what do the fibres do when they enter the brain stem
They descend in the spinal tract of the trigeminal adjacent to the nucleus.
When it gets to the bottom it jumps in
What does it do in the nucleus
Synapses ipsilaterally into the secondary neuron
What does the secondary neuron do
Cross the midline to the thalamus via the trigeminothalamic tract
Where do these descending fibres run in terms of depth on the brain stem
They’re superficial - outer edge of medulla
trigeminalthalamic tract runs where in terms of depth
Deep in the medulla, pons and midbrain - small diameter
What info does the left trigeminothalamic tract carry
Right side information
What info does the right spinal tract carry
info from RHS
at medulla on right hand side if there is a lesion what damage is caused
right hand face
left hand body
which artery runs anterior to the medulla and what could happen
ant. inf. cerebellar artery
aneurysm could cause ipsilateral side of face deficit and contralateral body
discriminative touch fibre goes into which nucleus
what is the fibre like
Pontine nucleus
Fat, fast, myelinated
proprioception fibre goes into which nucleus
Mesencephalic nucleus
if you are a proprioceptive fibre your cell body does not sit in the trigeminal ganglion you sit in
mesencephalic nucleus
Proprioceptive pathway primary neuron synapses where
mesencephalic nucleus
proprioceptive pathway primary neuron runs with which nerve
in mandibular division of trigeminal
where does the secondary neuron of proprioceptive pathway synapse
medial to mesencephalic nucleus
why is this different?
for proprioception of mouth
jaw jerk reflex - fibres go to where
motor neurons in trigeminal motor nucleus - just one synapse
