Organisation of Nervous System

Question 1

somatosensory axis of nervous system includes:

Answer 1

spinal cord
reticular substance of medulla, pons &mesencephalon
cerebellum
thalamus 
cerebral cortex

Question 2

skeletal motor nerve axis includes:

Answer 2

spinal cord
reticular substance of medulla, pons &mesencephalon
cerebellum
basal ganglia
motor cortex

Question 3

signal passes from

Answer 3

axon to dendrites

Question 4

most storage of memory occurs in?

Answer 4

cerebral cortex

Question 5

storage of memory is a function of?

Answer 5

synapses

Question 6

what is facilitation?

Answer 6

each time certain types of sensory signals pass through a sequence of synapses, these synapses become more capable of transmitting the same type of signal the next, this is called facilitation

Question 7

major levels of cns

Answer 7

spinal cord level
lower brain/subcortical level
higher brain/cortical level

Question 8

neuronal circuits in spinal cord can perform:

Answer 8

walking movements
reflexes that withdraw portions of the body from painful objects
reflexes to stiffen legs
reflexes that control blood vessels, git movements & excretion

Question 9

subconscious activities of the body are controlled by:

Answer 9

lower areas of the brain: medulla pons mesencephalon hypothalamus thalamus cerebellum basal ganglia

Question 10

subconscious control of arterial pressure & respiration is acheived mainly in?

Answer 10

medulla & pons

Question 11

control of equilibrium is a combined function of?

Answer 11

cerebellum (older portions) & reticular substance of medulla pons & mesencephalon

Question 12

feeding reflexes (salivation & licking of the lips in response to taste of food) are controlled by areas in:

Answer 12

medulla pons mesencephalon amygdala and hypothalamus

Question 13

thought processes are conducted by?

Answer 13

cerebral cortex

Question 14

which structures initiate wakefulness in cerebral cortex?

Answer 14

lower brain centers

Question 15

most synapses in the brain are:

Answer 15

chemical synapses

Question 16

electrical synapses

Answer 16

• bidirectional

- gap junctions allow free movement of ions from one cell to another

Question 17

chemical synapses

Answer 17

• one way

- release neurotransmitters

Question 18

presynaptic terminals are also called

Answer 18

terminal knobs
boutons
end feet
synaptic knobs

Question 19

width of synaptic cleft:

Answer 19

200-300 angstroms

Question 20

two most important internal structures of the presynaptic terminal:

Answer 20

transmitter vesicles

mitochondria

Question 21

the quantity of neurotransmitters released from the terminal to the cleft is directly proprtional to the amount of which ions entering the presynaptic terminal?

Answer 21

calcium ions, which enter and bind with release sites