Peripheral Nerve Flashcards

1
Q

create myolien in the PNS

A

Schwann Cells

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2
Q

Peripheral Nerves contains ______but no _______

A

axons, dendrites

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3
Q

A nerve is usually made up from a variety of fascicles . Each fascicle is encased by ________.

A

perineurium

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4
Q

Inside the fascicle are a group of axons bathed in __________

A

endoneurial fluid

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5
Q

Each axon has an insulating lining of _____

A

myelin

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6
Q

Between the fascicles is a fatty material called the________

A

interfascicular epineurium

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7
Q

binds several fascicles into a nerve trunk

A

epineurium

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8
Q

A peripheral nerve contains:

A
  • axons
  • Schwann cells (produce myelin)
  • Support cells (produce fibrocollagenous tissue; spindle-shaped
  • blood vessels
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9
Q

Surrounds individual axons, Schwann cells and blood vessels

A

Endoneurium

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10
Q

The endoneurium is composed mainly of reticular fibers (RF) synthesized by ___________

A

Schwann cells

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11
Q

myelinated processes

A

white matter

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12
Q

nerve cell bodies, dendrites, axon terminals, bundles of unmyelinated axons and neuroglia

A

Gray matter

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13
Q

In the spinal cord = gray matter forms

A

an H-shaped inner core surrounded by white matter

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14
Q

In the brain - a thin outer shell of _______ covers the surface & is found in clusters called nuclei inside the CNS

A

gray matter

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15
Q

myleinate axons in the CNS

A

oligodendrocyte

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16
Q

Types of receptors

A
  • Mechanoreceptor
  • Thermoreceptors
  • Nociceptors
  • Proprioceptors

(muscle spindles)

17
Q

Muscle Spindle

A
  • encapsulated sensory receptor
  • specialized stretch receptor
18
Q

non-encapsulated sensory receptors in the skin

A
  • Epidermal free ending
  • Merkel ending
19
Q

encapsulated sensory receptors in the skin

A
  • Pacinian corpuscle
  • Krause end bulb
  • Meissner’s corpuscle
  • Ruffini corpuscle
20
Q

Receptors for ATP, histamine, and bradykinin mediate painful sensations

A

pain-sensitive endings

21
Q

stimulates heat-sensitive Ca+ channels in these endings

A

Capsaicin

Vanilloid receptor, VR1 =

Transient receptor potential,

TRPV1

22
Q

Merkel’s Discs and Mechanoreception are found in which layer of the epithelium?

A

basal layer

touch receptors

23
Q

stimulates cold-sensitive Ca+ channels (Vanilloid receptors)

A

MENTHOL

Vanilloid receptor,

Transient receptor

potential,

TRPM8

24
Q

pressure receptors fast conducting bulb shaped receptors located deep in the dermis in the skin and also in various internal organs

A

pacinian corpuscle

sensitive to vibration

25
Voluntary motor and sensory components
Somatic nervous system
26
Involuntary control of viscera Sympathetic system “fight-or-flight; thoraco-lumbar Parasympathetic system “steady-state”; cranio-sacral
Autonomic nervous system
27
Located in the border between dermis and epidermis, "cotton candy-like" structure surrounded by fibroblast and Schwann cells
Meissner’s Corpuscles touch receptor
28
Contains autonomic ganglion for contraction of smooth or cardiac muscle, stimulation or inhibition of glandular secretion
Autonomic motor neuron
29
Nerves release angiogenic factors such as
VEGF (Vascular Endothelial Growth Factor)