CNS and PNS

Question 1

What protects the CNS?

Answer 1

Bones (Skull and spinal columns) meninges, and cerebrospinal fluid

Question 2

Dura mater

Answer 2

1st layer of meninges, tough thick layer with no stretch

Question 3

Arachnoid mater

Answer 3

2nd layer of meninges, soft and spongy, web-like

Question 4

Subarachnoid space

Answer 4

3rd layer of meninges, filled with CSF

Question 5

Pia mater

Answer 5

4th layer of meninges, smaller blood vessels, follows all surfaces

Question 6

Cerebrospinal fluid

Answer 6

clear fluid that fills the ventricular system

Question 7

3 purposes of CSF

Answer 7

allows brain to float, reduces shock, and reduces pressure

Question 8

Hydrocephalus

Answer 8

An obstruction of the ventricular system due to CSF not draining

Question 9

CNS: spinal cord

Answer 9

connects brain to PNS, distributes motor info, operates separate from brain through reflexes

Question 10

Dorsal root

Answer 10

spinal root that contains incoming (afferent) sensory neurons

Question 11

Ventral root

Answer 11

spinal root that contains outgoing (efferent) motor axons

Question 12

What protects the PNS?

Answer 12

the dura and pia mater

Question 13

2 types of nerves in CNS

Answer 13

spinal and cranial