Test 2: Trigeminal Flashcards
Where are the CB?
Trigeminal ganglion: all except proprio
Tigeminal mesencephalic nucleus (ONLY one in CNS): proprioception only
What are the 3 tracts and what modalities?
Trigeminal leminiscal: touch
Trigeminal thalamic: pain and temp
Dorsal trigeminothalamic: dental pressure
Where are the 2CB for the trigeminal leminiscal?
Main nucleus- pons
Where does the trigeminal leminiscal dessucate?
2nd neuron in pons
What tract do the 2neurons travel in trigeminal leminiscal?
trigeminal leminiscal
Where do 2neurons synpase on 3rd in trigem leminiscal?
VPM nucleus in thalamus
Where do the VPM neurons in trigem leminisc synapse in cortex?
Primary somatic sensory cortex (touch and proprioception)
Where do 1neurons travel in Trigeminothalamic tract?
Down spinal trigeminal tract! like lissaures
Where do 1neurons synpase with 2nd/2CB of trigeminothalamic tract?
Spinal trigeminal nucleus- medulla
oral, interpolar, or caudal nuclei
Where do trigeminothalamic 2neurons decussate?
in that level of medulla
What tract do 2neurons travel up to cortex in trigeminothalam?
Trigeminothalamic tract
Where do 2neurons synapse on 3rd in trigeminothalamic?
VPM and VMp and medial dorsal nucleus
Where do 3neurons go in trigeminothalamic?
cinulate gyrus (from med. dors nuc): emotion
SI: from VPM
Insula/S2 (from VPM): affective aspect pain
What is the function of trigeminal (CNV)?
Carry somatosensory info for:
face, scalp, eyes, sinuses, teeth, eardrum, oral cavity, ant 2/3rd tongue
Control muscle of mastication Sensory functions for discriminitive touch of face/dental pressure Jaw proprioception Face pain/temp Innvervates dura mater
What are the 3 parts of CNV?
V1: Opthalamic
- forehead to top of nose
- enters superior orbital fissure
V2: Maxillary
- nose to lips
- enters Rotundum Foramen
V3: Mandibular
- ear laterally to chin
- enters Ovale Foramen
What are the 3 nucleus groups from midbrain-medulla
Trigem mesenceph nuc: proprioception
Trigem main nuc: touch, dental pressures, mechanoreceptors
SpinalTrigem Nuc: oral, interpolar, and caudal
What is in the trigeminal mesencephalic nucleus?
1CB for proprioception afferent fibers
ONLY CNS ganglia
What is in trigeminal main nucleus?
2CB for discriminitive touch/dental pressure
mechanoreceptors
Where does the spinal trigeminal nucleus occupy?
ponse to caudal medulla/rostral C-spine
What are the 3 parts of the spinal trigeminal nucleus
- Oral: 2CB orofacial fine touch
- Interpolar: 2CB for orofacial pain, temp, and itch
- Caudal: 2CB head and face pain, temp, and itch
- extension of dorsal horn functionally
What is in trigeminal ganglia?
ALL 1 CB EXCEPT PROPRIOCEPTION
proprio in trigem mesesnceph nuc
What are the BA areas for S1 and S2?
BA 1, 2, and 3
Where is 1CB for dorsal trigem tract?
trigeminal ganglia
-dental pressure
Where does dorsal trigem tract 1neuron synpase on 2CB
main nucleus
ponse
What tract does 2neurons travel in dorsal trigeminal
dorsal trigeminal tract
Where does 2neurons synapse in dorsal trigeminal tract
Where does 3nerons synapse
IPSILATERAL VPM
S1/S2
What pathways does oral pressure/proprioception go?
trigeminal mesencephalic tract
Where is the 1CB of the trigeminal mesencaphalic tract?
trigeminal mesencephalic nucleus
-goes from muscle spindle NO CB in ganglia-> nucleus
Where does 1neuron synapse on 2CB trigeminal mesencephalic tract
trigeminal motor nucleus
AND
main nucleus-> decussates to contralat VPM
What is the viscerosensory pathway
originates from pressure receptors in pharynx, larynx, esophogause, and chest viscera
-axons in CNIX and X
What is the path for the viscerosensory pathways
CN IX/X-> solitary tract -> CAUDAL solitary nuclues (medulla)
2CB solitary nucleus -> VPM-> insula
OR 2CB -> parabrachial nucleus (pons)-> hypothal/amygdala
