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| Laboratory 12 : Tract Systems I |
| Somatosensory System : Trigeminothalamic Tract |
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Trigeminothalamic Tract
It is important to note that:
- This tract contains somatosensory info from head.
- Tract decussates either at level of rostral medulla (synapses on main sensory nucleus of cranial nerve V) or at caudal medulla (synapses on STN)
- Contains info about all somatosensory submodalities.
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Slide 91 : Telencephalon
- Synapses on face/head area of 1º somatosensory cortex.
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Slide 60 : Diencephalon
- These fibers synapse in the VPM in the thalamus.
- Then, VPM axons project up to 1º somatosensory cortex.
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Slide 37 : Rostral Medulla
- Signals coming from face and head come in via cranial nerve V (Trigeminal).
- Another collateral synapses on main sensory nucleus of cranial nerve V in the rostral medulla, main sensory neuron axon decussates and enters the medial leminiscus and goes up to thalamus.
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Slide 16 : Caudal Medulla
- A collateral sensory neuron goes to medulla, where it synapses on the spinal trigeminal nucleus (STN).
- STN neuron axon decussates and enters medial lemniscus to ascend to thalamus.
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Copyright © 2006 - University of Pennsylvania School of Veterinary Medicine, All rights reserved.
Faculty: Dr. Richard Miselis, Dr. Peter Hand
Students: Natalie Fickel V'12, Ryan Donahue V'09, Cara Catanese V’08, Rebecca Wolf V'06, Keith Javic V'03, Ken Bixel V'99, Russel Howe-Smith V'97
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