NB11 Peripheral nn + periphera sensory receptors

Question 1

What are the 2 classification systems of peripheral nerves + short description:

Answer 1

Roman numberal : sensory

Letter system: sensory and motor

Question 2

What happens to diameter and velocity as you go from 1a to 1b to 2 to 3 to 4
in the roman numeral system?

Answer 2

diameter in micrometers decreases, velocity decreases

Question 3

What is the function of C fibres+ roman name?

Answer 3

4
pain , temperature
e.g. tooth ache,

Question 4

What is the function of A-delta fibres + roman name?

Answer 4

3
pain and cold temperatures
e.g. sharp tooth pain

Question 5

What detects muscle spindle?

Answer 5

A alpha (1a) OR A beta (2)

Question 6

What is the origin of :
a) 1a fibres
b) 1b fibres
c) 2 fibres
\+ their letter name

Answer 6

1a: A-alpha muscle spindle
1b: Golgi tendon organ A-alpha
2: muscle spindle , touch , pressure A-beta
3: pain and cold A-delta
4: pain and temperature C

Question 7

What is the general function of A-alpha?

Answer 7

alpha-motorneurones, muscle spindle, Golgi tendon organs, touch

Question 8

What happens to diameter and conduction velocity as you go up the alphabet.
e.g. A-alpha, A-beta ,A-gamma, A-delta, B, C

Answer 8

diameter and velocity decreases

Question 9

What is the role of alpha-gamma fibres?

Answer 9

touch , pressure, gamma-motorneurons

Question 10

1) What is the preganglionic fibre?
2) What is the post ganglionic fibre?
3) Which is the longest in the parasympathetic ANS?
4) Which is the longest in the sympathetic ANS?

Answer 10

1) B fibre
2) C fibre
3) B fibre
4) C fibre

Question 11

What is the somatic motor fibre called going to

a) skeletal mm.
b) muscle spindle

Answer 11

a) A-alpha fibre

b) A-gamma fibre