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12 Cards in this Set
- Front
- Back
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What are the 3 parts of the Trigeminal Nucleus?
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1. Principle/Chief Trigeminal nucleus
2. Spinal Trigeminal n 3. Mesencephalic n (not necessary) |
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What are the 3 parts of the spinal trigeminal n and location of the nuclei?
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- mid-pons caudally and becomes dorsal horn
1. oral 2. interpolar 3. caudal |
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Where is the principle/chief trigeminal nucleus located? What type of fibers synapse here?
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mid pontine
Touch, vibration, proprioception |
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What is the pathway of the cranial touch?
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- Enters via trigeminal ganglion in the sensory root to enter pons
- syapses at level at Principle Trigeminal N - crosses at level - ascends via the trigeminalthalamic tract (medial to medial lemniscus) - enters VPM - terminates in the Somatosensory region of the head (ventral) |
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Where is the caudal trigeminal nuclei located? what type of fibers synapse here?
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Obex down to the cervical cord
pain and temperature |
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What is the pathway of the cranial pain/temp?
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- Enters via trigeminal ganglion in the sensory root to enter at the pons
- descend via spinotrigeminal tract (lateral to spinotrigeminal nucleus) - synapse within the caudal trigeminal nucleus - cross at this level - ascend and then at pons level join the touch fibers - VPM - primary sensory cortex, face area |
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What is the function of the thalamus?
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- gateway to the cortex
- process and relays sensory information to various parts of the cortex - recipricol connections with cortex (arrousal) = process and relays BG/Cere to cortex |
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What are the areas of the thalamus? what do they correspond to?
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Medial (slow pain)
Anterior Poster: (4) VA (BG) VL (cerebellum) VPL (contralateral trunks/limbs) VPM (contralateral face) |
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What area of the cortex does the VA project to and what level of the thalamus is it found at?
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- projects to the premotor cortex
- optic chiasm |
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What area of the cortex does the VL project to and what level of the thalamus is it found at?
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- projects to the primary motor cortex (pposterior precentral gyrus near the central sulcus)
- tubular region of the thalamus |
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What region of the cortex does the VPM project to and what level of the thalamus is this at?
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- post central gyrus (primary sensory cortex)
- red nucleus |
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What region of the cortex does the VPM project to and what level of the thalamus is this found at?
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- post centrla gyrus (primary sensory cortex, ventral region for face)
- red nucleus |
