Peripheral nervous system

Question 1

What is the PNS composed of?

Answer 1

Nerves (cranial and spinal) and ganglia outside the brain and spinal cord

Question 2

What are dermatomes and myotomes?

Answer 2

Dermatomes - An area of skin innervated by a single spinal nerve
Myotome - A group of muscles innervated by a single spinal nerve

Question 3

What are peripheral nerves arranged in?

Answer 3

Fasiculi

Question 4

What connective tissue is present in spinal nerves?

Answer 4

External vascular layer - EPINEURIUM
Individual fasicles covered in PERINEURIUM
Individual axons covered in ENDONEURIUM

Question 5

What are the 2 classification systems for peripheral nerves?

Answer 5

One based on conduciton velocity - Using letters A, B & C (A being the fastest)

One based on axonal diameter - Using roman numerals I-IV (I having the largest diameter)

Question 6

What are the two classifications of the source of a stimulus?

Answer 6

External - Extroceptors

Internal - Proprioceptors & Enteroceptors

Question 7

What is a neuromuscular junction?

Answer 7

A specialised synapse between a motor neuron adn a muscle fibre