travers 3 trigeminal Flashcards by Chris Stryker

mandibular division is ____ and ____ the other two are just _____

sensory and motor, other two are just sensory

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CNS 3 parts trigeminal goes to

Midbrain- mesencephalic nucleus
pons- motor and principle, main, or chief sensory nucleus
medulla- spinal trigeminal nucleus- oralis, interpolaris, caudalis (medullary dorsal horn).

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where does trigeminal cross?

sensory nucleus and spinal trigeminal nucleus

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where does trigeminal end in

VPM of thalamus, then to prital cortex, oral/face structures closer to later side of brain

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fastest and biggest fiber

A beta

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adaptation vs. receptor abbreviations, what does 1 or 2 stand for and what does R or S stand for

R= fast adaptation no static response
S= slow adaptation
1= small sharp borders
2= large, obscure borders

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in the hand what kind of endings are superficial 1 or 2?

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in the hand what are the superficial endings

meissners corpuscle RA1 and merkel disc SA1

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meissners corpuscle responsible for what

spatial discrimination

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merkel disc responsible for what

pressure

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in the hand what kind of endings are deep 1 or 2?

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in the hand what are the deep endings

Pacinian corpuscle RA2, ruff ini ending SA2

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Pacinian corpuscle resoponsible for what

vibration

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Ruffini ending responsible for what?

Skin stretch

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which endings are encapsulated?

pacinian and meissners corpuscle

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Factors Influencing Mechanoreceptors

size of fiber and degree of myelination
location of receptor superficial vs deep
structure of ending (encapsulated)
transduction (ENaC’s and TRP)

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more sensitivity = higher or lower threshold

lower

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von frey hairs do what?

measure touch discrimination. device that measures the tactile sensitivity of the skin

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most sensitive part of face?

lips, numbers correspond to discrimination of two points in mm. lower numbers = more sensitive

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infraorbital is branch from what

maxillary V2

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infraorbital nerve

SA1, SA2, RA1, NO RA2, so no pacinian corpuscles.

without no pacinian corpuscles paraoral and facial structures have low what

vibrotactile sensitivity, higher the number the more intense vibration sense it takes to feel

lingual nerve branch of what big nerve

mandibular nerve V3

tongue sensitivity _____ as you go towards the back of it

decreases

what kind of endings predominate in the tongue. what is a specialized example

uncapsulated (coiled endings, krause end bulbs....similar to meissiner corpuscle in hand)

what makes tongue unique when it comes to endings?

tongue and both rapidly and slowly adapting mechanoreceptors despite only having one kind of ending.

Kraus end bulbs (like Meissner) characteristics in the tongue

- high density and small receptive fields at tip. - both rapidly and slowly adapting responses - high sensitivity

whats a problem following third molar extractions?

trigeminal dysfunction, usually, lip impacted more than tongue. high regeneration opportunity because so far away from cell body.

mental nerve goes to what

the lower lip and chin

what nerves go to 3rd molar

inferior alveolar, and lingual

innervation of TMJ

auriculotemporal nerve

mandibular nerve part of trigeminal exits skull through what

foramen ovale

auriculotemporal is branch of what nerve?

mandibular V3

aucriculotemporal innervates mainly what part of the TMJ

posterior and lateral, some medial

accessory sensory innervaion of TMJ and what parts

Masseter and posterior deep temporal nerve- both anterior TMJ

what kind of nerve endings are in TMJ mechanoreceptors

mostly free nerve endings (C)

which nerve endings are most prominent in TMJ

Ruffini > Golgi tendon organs > pacinian

Mechanoreceptors of the Periodontal Ligament nerves

inferior alveolar, superior alveolar

ant/post. teeth more sensitive?

anterior teeth

Innervation of Periodontal ligament (endings) | which two are specialized endings in PDL

1. complex ruff ini (special) 2. simple ruffini (special) 4. unmylenated free nerve endings

where does the nerve that innervates more of the middle of the PDL send sensory information

trigeminal ganglia

where does the nerve that innervates more of the bottom of the PDL send sensory information

mesencephalic nucleus

Periodontal Ligament Mechanoreceptor are _____ ______ | time

rate sensitive (Note fewer action potentials as stimulus is applied more slowly:)

Periodontal Mechanoreceptors are also _____ sensitive

directional sensitive

which directions are PDL most sensitive?

labial and distal force

denture and implant patients have trouble doing what

controlling force but not generating force.

what is stereognosis sensitivity?

ability to distinguish shape

what kind of dental works leaves patients with less stereognosis sensitivity?

denture patients.

PDL receptor function

1. jaw reflexes 2. interdental discrimmination 3. detect forces to teeth 4. sterognosis 5. salivation

which pathway involves the mesencenphalic nucleus

"reflex" pathway

which fibers are temperature sensitive?

A delta and C

does warm or cold have more variation?

warm, tongue tip the most sensitive