Term
| name the sensory nuclei of the trigeminal tract |
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Definition
| spinal trigeminal nucleus, chief sensory nucleus and mesencephalic nucleus |
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Term
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Definition
| mid-rostral pons; lies next to trigeminal motor nucleus and is just inferior to superior cerebellar peduncle |
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Term
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Definition
| transverses the length of the midbrain, dorsolateral to the PAG; cell bodies of 1st order neurons |
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Term
| what kind of neurons does the mesencephalic nucleus have and what is their functional modality? |
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Definition
| pseudounipolar; conscious and unconscious proprioception; including reflexes to trigeminal motor nucleus; projection to chief sensory nucleus for proprioception; and projections to the cerebellum |
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Term
| name the nerves that are tested by the jaw jerk reflex and describe the pathway. |
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Definition
| mesencephalic nucleus; the jaw jerk reflex tests the integrity of the mandibular and trigeminal nerves as well as the cranial nerve nuclei and pathways involved. |
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Term
| does the mesencephalic nucleus only get information from trigeminal fibers? |
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Definition
| No, it also gets info from external resources, helping regulate orofacial movements |
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Term
| jaw position, bite force, etc. are examples of what modality? describe the pathway |
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Definition
| proprioception; mesencephalic fibers --> TMN or CSN or cerebellum |
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Term
| describe the pathway for discriminative touch |
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Definition
| 1st order --> chief sensory nucleus and synapse --> 2nd order fibers become ventral trigeminalthalamic tract and go to VPM --> 3rd order fibers to post-central gyrus via PLIC and corona radiata |
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Term
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Definition
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Term
| where does the VTT synapse? |
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Definition
| IN the VPM nucleus, or ventral posterior medial nucleus in the thalamus |
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Term
| describe the pathway of primary sensory pain and temperature fibers. |
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Definition
| in through pons and medulla to spinal trigeminal nucleus (7,9,10 also have some pain/temp fibers traveling through this nucleus) |
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Term
| pain and temperature fibers for the central face are represented in what part of the spinal trigeminal nucleus? |
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Definition
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Term
| p/t fibers from peripheral face are represented in what part of the spinal trigeminal nucleus? |
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Definition
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Term
| what is the spatial relatinoship of V3 V2 and V1 in spinal trigeminal tract? |
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Definition
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Term
| dorsal ventral somatotopy overlies caudal dorsal somatotopy in STT, can you draw a picture of this? |
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Definition
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Term
| trigeminal tractotomy is easy in what way? what is it used for? |
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Definition
| STT is fairly approachable between the inferior olive and middle cerebellar peduncle. Trigeminal tractotomy is one approach to facial pain. |
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Term
| descending fibers from five to seven system probably utilize what pathway? |
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Definition
| Medial longitudinal fasciculus |
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Term
| corneal reflex; describe pathway |
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Definition
| free nerve endings in cornea; synapse in Chief Sensory Nucleus; fibers are hard wired to facial nucleus and stimulate axons to orbicularis occuli |
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Term
| How is the blink reflex different if it is stimulated by nociception? What affect will large stimulus have on the blink reflex? |
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Definition
| it will utuilize the spinal trigeminal tract; a larger stimulus will involve the orbital part of the orbicularis occuli. |
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Term
| focal tegmental midbrain lesion can include |
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Definition
| contralateral loss of pain/temp from the face |
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Term
| what three pathways travel to the ventral posterior thalamus |
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Definition
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Term
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Definition
| 3 neuron chains for all of it; 1st order neurons usually synapse in ganglia, 2nd order neurons usually decussate, and 3rd order neurons are located in ventral posterior thalamus |
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Term
| lesions of spinal trigeminal nucleus and tract |
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Definition
| ipsilateral analgesia and thermoanesthesia |
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Term
| lesion of VTT, VPM, PLIC,or PCG will lead to what? |
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Definition
| it will lead to contralateral analgesia and anesthesia |
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Term
| Wallenburg or lateral medullary syndrome |
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Definition
| large lesion of the dorsolateral medulla that causes ipsilateral loss of pain and temperature from face and crontralateral loss of pain and temperature from trunk and limbs |
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Term
| mesencephalic reflexes are unilateral or bilateral? |
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Definition
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Term
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Definition
| adjacent and dorsal to the medial lemniscus |
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