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13 Cards in this Set
- Front
- Back
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Sensory distribution of CN V
1. Ophthalmic (V1) 2. Maxillary (V2) 3. Mandibular (V3) |
1. forehead, upper eyelid, tip of nose, cornea, conjunctiva
2. upper eyelid, cheek, upper lip, upper mouth (teeth, gums, palate) 3. lower lip, chin, external auditory meatus, tymapnic membrane, and ear, lower mouth (teeth, floor, gums, ant 2/3 tongue) TMJ |
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Types of sensation
1. ventral trigeminothalamic tract 2. dorsal trigeminothalamic tract 3. principal sensory nucleus 4. spinal trigeminal nucleus 5. mesencephalic nucleus |
1. pain, temp, tactile, pressure from face (crossed)
2. same as ventral but just a few fibers from inside the mouth (uncrossed) 3. tactile, pressure from face 4. pain and temp from face 5. proprioception from head |
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Muscles of mastication:
1. What are they and which ones open or close the jaw? 2. what innervates them? |
1. temporalis, masseter, and medial pterygoid (close) and lateral pterygoid (opens)
2. trigeminal motor nucleus (SVE) which receives bilat corticobulbar input and mesencephalic nucleus input (jaw jerk) |
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Jaw jerk reflex
1. afferent limb 2. first order neuron 3. efferent limb |
1. V3 (sensory) of mandible
2. mesencephalic nucleus 3. V3 (motor)to jaw mm. |
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Corneal reflex
1. afferent limb 2. first order neuron 3. second order neuron 4. third order neuron 5. efferent limb |
1. V1 of cornea/conjunctiva
2. trigeminal ganglion 3. spinal trigeminal nucleus 4. bilateral facial nuclei 5. facial n. to bilat orbicularis oculi mm. |
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Lacrimal (tearing) reflex
1. afferent limb 2. first order neuron 3. second order neuron 4. third order neuron 5. efferent limb |
1. V1 of cornea/conjunctiva
2. trigeminal ganglion 3. superior salivatory ganglion ("lacrimator" portion) 4. pterygopalatine ganglion 5. CN VII fibers joing V1 and V2 branches to lacrimal gland |
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Trigeminal neuralgia (tic douloreux)
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sharp, stabbing pain in one or more branches of CN V on one side of the face
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Herpes zoster ophthalmicus
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viral infection of V1 that can lead to blindness
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Paratrigeminal (Raeder) Syndrome
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lesions of trigeminal ganglion and sympathetic fibers causing miosis, ptosis, facial pain, and trigeminal palsy
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Acoustic Neuroma (Schwannoma)
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tumor in IAM that affects CN 7 (facial weakness, loss of efferent corneal reflex) CN 8 (tinnitus, hearing loss), and sometimes spinal trigmenial tract (ipsi loss of pain and temp of face and afferent corneal reflex)
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Cavernous Sinus syndrome
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aneurysm of cavernous sinus that may affect CN 3, 4, V1, V2, 6, and postgang symp to the eye (Horner's syndrome)
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internal opthalmoplegia
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destruction of CN 3 paralyzing not only SR, IR, MR, and IO, but also parasymp
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CN V lesions and their impact on mm. of mastication
1. UMN lesion 2. LMN lesion |
1. no paralysis; UMN projects bilaterally
2. paralysis ipsi mm. of mastication (hollwed out face, contral pterygoid displaces jaw to wasted side) |
