Week 1:1

Question 1

Divisions of the CNS

Answer 1

• brain

- spinal cord

Question 2

brain functions

Answer 2

• receives and processes sensory information
• initiates responses
• stores memories
• generates thoughts and emotions

Question 3

spinal cord functions

Answer 3

• conducts signals to and from the brain

- controls reflex activities

Question 4

divisions of the PNS

Answer 4

• motor neurons

- sensory neurons

Question 5

motor neurons

Answer 5

CNS to muscles and glands

Question 6

sensory neurons

Answer 6

sensory organs to CNS

Question 7

divisions of motor neurons

Answer 7

• somatic nervous system

- autonomic nervous system

Question 8

somatic nervous system controls

Answer 8

voluntary movements

Question 9

autonomic nervous system controls

Answer 9

involuntary responses

Question 10

divisions of autonomic nervous system

Answer 10

• sympathetic

- parasympathetic

Question 11

sympathetic

Answer 11

fight or flight

Question 12

parasympathetic

Answer 12

rest or digest

Question 13

Good way to know if something’s part of the PNS

Answer 13

if it’s not encased in bone

Question 14

soma

Answer 14

body

Question 15

afferent

Answer 15

sensory, ascending, toward the brain

Question 16

efferent

Answer 16

motor, descending, away from the brain

Question 17

white matter

Answer 17

• consists of myelinated axons

- conducts information

Question 18

gray matter

Answer 18

• cell bodies

- information integrated

Question 19

dendrites

Answer 19

receive messages

Question 20

Where is information carried in a neuron?

Answer 20

down the axon via an action potential to the axon terminals

Question 21

Why are cell bodies important?

Answer 21

integration of information

Question 22

gray matter in the spinal cord

Answer 22

horns

Question 23

white matter in the spinal cord

Answer 23

columns

Question 24

sensory aspect of the spinal cord

Answer 24

• enters the dorsal horn via dorsal root ganglia

- processed into motor command if necessary

Question 25

motor aspect of the spinal cord

Answer 25

exits ventral horn

Question 26

What are the protective components?

Answer 26

- blood brain barrier - CSF - spinal column - meninges

Question 27

blood brain barrier

Answer 27

cells of the nervous system

Question 28

CSF made of

Answer 28

- salts, sugars, water | - keeps osmotic balance

Question 29

Through which system does CSF flow?

Answer 29

ventricular system

Question 30

What helps the brain "float"?

Answer 30

CSF

Question 31

Why does the brain need to float?

Answer 31

- shock absorption - prevents compression - gravity would exert major effect without it

Question 32

layers of the meninges

Answer 32

- dura mater - arachnoid mater - subarachnoid space - pia mater

Question 33

mater =

Answer 33

mother

Question 34

What does the dura mater contain?

Answer 34

- sinuses that help drain the brain | - has own blood supply

Question 35

What is the arachnoid mater?

Answer 35

- weblike membrane | - helps keep brain suspended along with dura mater

Question 36

What does the pia mater do?

Answer 36

- follows all brain's contours | - encases the vessels

Question 37

subarachnoid space significance

Answer 37

CSF flows through here

Question 38

Which of the meninges is pain sensitive?

Answer 38

dura mater only

Question 39

What is present in the spinal meninges but not the cerebrum?

Answer 39

epidural space

Question 40

subdural space

Answer 40

no subdural space

Question 41

significance of meninges

Answer 41

- inflammation can be deadly | - nervous system complications

Question 42

hematoma

Answer 42

- blood supply to meninges is damaged or disrupted | - can have primary or secondary injuries