Sensory Systems

Question 1

What are two examples of free nerve endings receptors?

Answer 1

Nociceptors and cold receptors

Question 2

What are two examples of complex receptors?

Answer 2

Pacininan and Meissner’s Corpuscles

Question 3

What are the different types of cutaneous receptor fibres

Answer 3

A-alpha
A-beta
A-delta
C

Question 4

Describe the characteristics and stimuli detected by A-alpha fibres

Answer 4

Large myelinated (80-120m/s)

Proprioceptive

Question 5

Describe the characteristics and stimuli detected by A-beta fibres

Answer 5

Moderate myelinated (30-70m/s)

Detects: touch, pressure and vibration

Question 6

Describe the characteristics and stimuli detected by A-delta fibres

Answer 6

Small myelinated (5-30m/s)

Detects: Cold, “fast” localised pain, pressure

Question 7

Describe the characteristics and stimuli detected by C fibres

Answer 7

Unmyelinated (0.5-2m/s)

Detects: warmth and “slow” diffuse pain

Question 8

What is lateral inhibition?

Answer 8

Inhibition of lateral neurones enhances perception of stimulus (localisation)

Question 9

What type of fibre do mechanoreceptors use?

Answer 9

A-alpha and A-beta

Question 10

Where do mechanoreceptor first order fibres synapse?

Answer 10

In gracile and cuneate nuclei

Question 11

What happens to second order mechanoreceptor fibres?

Answer 11

Dessucate in the brainstem and then project into the thalamus and cortex

Question 12

What fibres transmit impulses from thermoreceptors and nociceptors?

Answer 12

A-delta and C