Peripheral Nerve Endings Flashcards

1
Q

Adrenergic

A

Neurons release epinephrine / norepinephrine

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2
Q

Iris Dilator

A

Primarily adrenergic. Adrenergic to cholinergic 3:1

Innervation is primarily sympathetic

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3
Q

Iris Sphincter

A

Adrenergic to cholinergic 1:6

parasympathetic

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4
Q

Afferent

A

axons in peripheral nerves are of three classes and have a variety of kinds of endings

A beta

A delta

C dorsal root

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5
Q

Sensory endings types

A

Free endings
encapsulated endings

Rapidly adapting (dynamic) : Respond only at onset (smell)
Slowly adapting (static) : respond continuously (hear)

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6
Q

Slowly adapting

A

slow: merkel and ruffini corpuscle end-organs, some free nerve endings

intermediate adapting: Some free nerve endings are intermediate adapting

Rapidly adapting: stuff. (said in class we dont have to memorize)

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7
Q

Sensory functions:

A

Nociception: painful tissue injury conducted by C fibers. Slowly adapting

Thermal: hot and cold

Mechanical: around hair follicles

Itching

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8
Q

Merkel Cells

A

Not neurons but associated with them. Has Tonic receptors for sustained light touch, and sensing objects texture.

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9
Q

Perineurium forms

endoneurium includes…

A

capsule of encapsulated nerve endings.

collagen fibers

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10
Q

Ruffini corpuscles

A

In dermis and subcutaneous tissues of thick skin.

primary mechanoreceptors of periodontal ligament

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11
Q

Meissner’s corpuscle

A

Encapsulated by perineural and schwann cells

rapidly adapting, sensitive to light touch and vibration

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12
Q

neuromuscular spindle

A

As extrafusal fibers stretch, intrafusal fibers detect stretch and stop from tearing.

Have both sensory and motor innervation
Type 1a sensory fibers have annulospiral endings
Type II sensory fibers have “flower-spray” endings that attach to the striated parts of intrafusal fibers

Gamma = intrafusal
Alpha = extrafusal

Go back to this slide (37)

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13
Q

Spindles in human jaw muscle

A

Temporalis Muscle: large

Masseter Muscle: medium

Medial Pterygoid Muscle: small

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