Axons & Receptor Types

Question 1

Name the Skin & Muscle Axons that are most myelinated.

Answer 1

Aa & Group 1

Question 2

What is the Diameter of Group 1/Aa axons?

Answer 2

13-20 um

Question 3

What is the Diameter of Group 2/AB axons?

Answer 3

6-12 um

Question 4

What is the Diameter of Group 3/Ad axons?

Answer 4

1-5 um

Question 5

What is the Diameter of Group 4/C axons?

Answer 5

0.2-1.5

Question 6

What is Conduction Speed of Group 1/Aa?

Answer 6

80-120 m/s

Question 7

What is Conduction Speed of Group 2/AB?

Answer 7

35-75 m/s

Question 8

What is Conduction Speed of Group 3/Ad?

Answer 8

5-30 m/s

Question 9

What is Conduction Speed of Group 4/C?

Answer 9

0.5-2

Question 10

What Sensory Receptors are Group 1/Aa used for?

Answer 10

Proprioceptors of Skeletal Muscle

Question 11

What Sensory Receptors are Group 2/AB used for?

Answer 11

Skin mechanoreceptors

Question 12

What Sensory Receptors are Group 3/Ad used for?

Answer 12

Pain & Temp

Question 13

What Sensory Receptors are Group 4/C used for?

Answer 13

Itch, Pain & Temp

Question 14

What type of sensation do Free Nerve Endings detect?

Answer 14

Pain; Adelta = Sharp pricking pain

C = Polymodal - Hot, Cold, Burning, Ache

Question 15

What Axons are used for Free Nerve Endings?

Answer 15

Ad & C

Question 16

Where are Free Nerve Endings found?

Answer 16

All skin types

Question 17

Describe Adaptation & Activation Threshold for Free Nerve Endings

Answer 17

Slowly adapt

High Activation Threshold

Question 18

Describe Composition of Merkel’s Discs

Answer 18

Nerve Ending + Specialised Epithelial Cell

Non-encapsulated endings

Question 19

What Fibres Are Used for Merkel’s Discs?

Answer 19

ABeta

Question 20

What do Merkel’s Discs detect?

Answer 20

Static Touch & Pressure

Question 21

Where Are Merkel’s Discs found?

Answer 21

All skin types

Lips, Genitals & Extremities

Question 22

Describe Adaptation & Activation Threshold for Merkel’s Discs

Answer 22

Slowly Adapting

Low Activation Thresh

Question 23

Describe composition of Meissner’s Corpuscles

Answer 23

Encapsulated nerve endings

Question 24

What do Meissner’s Corpuscles detect?

Answer 24

Changes in touch & pressure

Question 25

What fibres do Meissner's use?

Answer 25

ABeta

Question 26

Where are Meissner's found?

Answer 26

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

Question 27

Describe Adaptation & Activation Threshold for Meissner's Corpuscles

Answer 27

Rapidly adapting | Low Activation Thresh