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11 Cards in this Set

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  • Back
How many sensory pathways exist for the trigeminal system? What is the distinguishing feature for each?
TWO pathways
-One pathway DESCENDS before crossing and the other crosses immediately
What structures are innervated by the trigeminal system?
1. Cornea
2. Mucocutaneous tissues around mouth & nostrils
3. Oral & nasal mucosae, sinuses
4. Tongue, anterior 2/3, teeth, & gums
5. Dura of anterior & middle cranial fossae
6. Skin of face to the vertex except angle of jaw & parts of ear
Primary Sensory Neurons

Location of nerve cell bodies?
How many nerve roots?
What parts of the head periphery are NOT supplied by CN V?
-Trigeminal ganglion
-3 nerve roots: Ophthalmic V-1, Maxillary V-2, Mandibular V-3
-Back of head & angle of the jaw
2nd-Order Trigeminal Neurons

-Location of neurons?
-Principal (chief) trigeminal nucleus AND Spinal trigeminal nucleus (DESCENDING)
What does the Principal trigeminal nucleus mediate?
What does the Spinal trigeminal nucleus mediate?
Principal: Fine touch stimuli, joint position, & vibration
Spinal: pain & temp.
What type of neurons does the Spinal trigeminal tract contain?
To what levels does the Spinal nucleus descend?
Lesions in what areas effect this nucleus?
-Primary afferents that synapse in the spinal (descending) nucleus of V.
-extends caudally to C2-3 & is continuous with the dorsal horn.
-caudal pons & medulla
What pathway do 2nd order neurons form? Where do they go?
-Trigeminothalamic pathway to VPM
(ventroposteromedial thalamus)
3rd order neurons in thalamus

Location of projected axons?
-Project to the Postcentral Gyrus
Primary Somatosensory = Postcentral Gyrus.

-Where is the Input? Output?
INPUT: from internal capsule from VPM & VPL for ALL ALC, DCML, & trigeminothalamic systems
OUTPUT: To Association Somatosensory Cortex
What happens when the Gyrus is injured?
Is temp perception affected?
Is pain perception affected?
-Diminished position sense & ability to discriminate size, texture, & shape.
-Temperature altered but not diminished
-NO pain is not in this gyrus
Association Somatosensory Cortex

-What is its important functions?
-Being able to recognize objects by palpation, stereognois (Astereognosis)
-Recognizing numbers written on their hand (Agraphesthesia)