Neuroscience 1

Question 1

What is the PNS divided into?

Answer 1

1. Somatic PNS - control motor and sensory function.

2. Autonomic Nervous System - controls organs. Sympathetic and parasympathetic arms.

Question 2

What is the direction of information flow in afferent axons?

Answer 2

Towards the CNS.

Question 3

What is the direction of information flow in efferent axons?

Answer 3

Away from the CNS.

Question 4

What are interneurons?

Answer 4

CNS neurones that synapse with other CNS neurones within brain + spinal cord.

Question 5

How are axons packaged into nerves?

Answer 5

Afferent and Efferent axons are bundled into fascicles and are surrounded by perineurium. The whole nerve is in a epineurium capsule. Some axons are myelinated and others are not.

Question 6

Which axons are able to regenerate?

Answer 6

Axons in the PNS can regenerate after injury.

Question 7

Which axons are unable regenerate

Answer 7

Axons in the CNS are unable to regenerate.

Question 8

What does white matter and grey matter consist of?

Answer 8

White matter - Ascending and descending axon tracts to and from the brain.
Grey matter - Neural cell bodies.

Question 9

What is the difference between ventral and dorsal roots?

Answer 9

ventral roots face the front of the body and conduct motor information whereas dorsal face the back and conduct sensory information.