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CNS - Lucocq > Axons & Receptor Types > Flashcards

Axons & Receptor Types Flashcards

1
Q

Name the Skin & Muscle Axons that are most myelinated.

A

Aa & Group 1

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2
Q

What is the Diameter of Group 1/Aa axons?

A

13-20 um

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3
Q

What is the Diameter of Group 2/AB axons?

A

6-12 um

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4
Q

What is the Diameter of Group 3/Ad axons?

A

1-5 um

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5
Q

What is the Diameter of Group 4/C axons?

A

0.2-1.5

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6
Q

What is Conduction Speed of Group 1/Aa?

A

80-120 m/s

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7
Q

What is Conduction Speed of Group 2/AB?

A

35-75 m/s

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8
Q

What is Conduction Speed of Group 3/Ad?

A

5-30 m/s

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9
Q

What is Conduction Speed of Group 4/C?

A

0.5-2

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10
Q

What Sensory Receptors are Group 1/Aa used for?

A

Proprioceptors of Skeletal Muscle

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11
Q

What Sensory Receptors are Group 2/AB used for?

A

Skin mechanoreceptors

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12
Q

What Sensory Receptors are Group 3/Ad used for?

A

Pain & Temp

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13
Q

What Sensory Receptors are Group 4/C used for?

A

Itch, Pain & Temp

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14
Q

What type of sensation do Free Nerve Endings detect?

A

Pain; Adelta = Sharp pricking pain

C = Polymodal - Hot, Cold, Burning, Ache

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15
Q

What Axons are used for Free Nerve Endings?

A

Ad & C

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16
Q

Where are Free Nerve Endings found?

A

All skin types

17
Q

Describe Adaptation & Activation Threshold for Free Nerve Endings

A

Slowly adapt

High Activation Threshold

18
Q

Describe Composition of Merkel’s Discs

A

Nerve Ending + Specialised Epithelial Cell

Non-encapsulated endings

19
Q

What Fibres Are Used for Merkel’s Discs?

A

ABeta

20
Q

What do Merkel’s Discs detect?

A

Static Touch & Pressure

21
Q

Where Are Merkel’s Discs found?

A

All skin types

Lips, Genitals & Extremities

22
Q

Describe Adaptation & Activation Threshold for Merkel’s Discs

A

Slowly Adapting

Low Activation Thresh

23
Q

Describe composition of Meissner’s Corpuscles

A

Encapsulated nerve endings

24
Q

What do Meissner’s Corpuscles detect?

A

Changes in touch & pressure

25
Q

What fibres do Meissner’s use?

A

ABeta

26
Q

Where are Meissner’s found?

A

Glabrous Skin Types (Non-hairy)
Between Dermal Papillae
Fingers, Palms, Toes, Plantars

27
Q

Describe Adaptation & Activation Threshold for Meissner’s Corpuscles

A

Rapidly adapting

Low Activation Thresh

CNS - Lucocq (6 decks)

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