Nervous System

Question 1

Pns

Answer 1

Afferent division (to brain)
- special sensory receptors
- visceral sensory (organs)
- somatic (muscles, skeleton ext)

Efferent
- autonomic
-somatic (skeletal)

Question 2

Anaxonic

Answer 2

• axons not differentiated from dendrites
  -v small
  -brain and special senses

Question 3

Bipolar neurons

Answer 3

Only in special senses
- cell body in middle

Question 4

Unipolar

Answer 4

Cell body to side
- most sensory neurons of pns

Question 5

Multipolar

Answer 5

• myelinated
• 2 or more dendrites on a single axon
• most common in cns
• al that control skeletal muscle age multipolar

Question 6

What does the spinal chord do

Answer 6

• major passageway of sensory impulses to and from brain
• integrates info on its own + controls spinal reflex

Question 7

Explain dorsal root ganglia and ventral roots

Answer 7

Dorsal Root ganglia
- contain cell bodies of sensory neurons
- bring sensory info to spinal chord

Ventral
- pair of ventral roots contain axons of motor neurons

Dorsal and ventral bound together in single spinal nerves

Question 8

What’s a dermatone

Answer 8

Pair of spinal nerves control an area of body surface

Question 9

What is a muscle spindle

Answer 9

Highly specialised encapsulated muscle cell that runs parallel to normal one

• sensitive to muscle length changes
• afferent neuron wraps around
• efferent causes spindle to contact to maintain tension in middle of fibre

No overstretch

Question 10

Layers of the brain

Answer 10

Reptilian- brain stem
Mammalian - limbic system
Higher brain - neocortex/ cerebral cortex