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A&P 223 > Exam #4 extras > Flashcards

Exam #4 extras Flashcards

(73 cards)

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1
Q

which pathways allow different parts of the nervous system to affect the activity of a neuron and when several neurons synapse with a smaller number of neurons?

A

convergent pathway

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2
Q

which pathway allows one part of the nervous system to affect more than one part of the nervous system and a small number of neurons synapse with a larger number of neurons?

A

divergent pathway

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3
Q

what is a reverberating circuit?

A

important functions that are periodically active such as sleep/wake cycle and respiration

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4
Q

where is sodium concentration higher?

A

extracellular

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5
Q

what is a nucleus

A

a cluster of cell bodies and their dendrites in the CNS

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6
Q

what is a ganglion?

A

a cluster of cell bodies and their dendrites in the PNS

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7
Q

what are some similarities between EPSPs and IPSPs? (3) (BCS)

A

1) both are graded potentials
2) conducted in a decremental fashion
3) size is proportional to the strength of the stimulus

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8
Q

what ionic changes in the membrane will promote depolarization?

A

sodium and calcium

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9
Q

are graded potentials reversable?

A

yes

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10
Q

what is temporal summation?

A

a single synapse fires rapidly in sequence

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11
Q

what is a IPSP?

A

when the hyperpolarization of a postsynaptic neuron occurs to a neurotransmitter

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12
Q

why does hyperpolarization of a postsynaptic neuron occur with a IPSP?

A

because it is more likely to reach a threshold

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13
Q

what are IPSPs due to?

A

the opening of chloride and potassium channels (hyperpolarization)

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14
Q

what is the purpose of the absolute refractory period?

A

to prevent potentials from being generated in the reverse direction

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15
Q

what is a plexus?

A

an extensive network of nerves outside the CNS

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16
Q

during an action potential what is repolarization due to?

A

potassium ions leaving the cell

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17
Q

which nerve fibers form the autonomic system?

A

B and C

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18
Q

the propagation of action potentials from one node of ranvier to another along a myelenated axon

A

saltatory conduction

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19
Q

what type of neurons are motor neurons and interneurons structurally?

A

multipolar

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20
Q

what does gray matter primarily contain?

A

neuron cell bodies

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21
Q

compared with the inside of the resting plasma membrane what is the outside surface of the membrane?

A

positively charged

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22
Q

what are leak channels responsible for?

A

the ion permeability of the resting plasma membrane

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23
Q

if the permeability of the plasma membrane to potassium increases what happens to the resting membrane potential difference and what is that called?

A

it increases and it’s called hyperpolarization

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24
Q

what happens to the plasma membrane during repolarization?

A

potassium diffuses out of the cell

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25
what is occurring during the absolute refractory period? (2) (LP)
1) limiting of how many action potentials can be produced during a given time 2) prevention of an action potential from starting another action potential at the same time at the same point on the plasma membrane
26
where are neurotransmitter substances stored in vessicles located?
in specialized portions of the axon
27
in convergent pathways what does the response of the postsynaptic neuron depend on?
the summation of EPSPs and IPSPs
28
what is the function of reciprocal innervation?
promotes relaxation of extensor muscles while opposing flexor muscles contract
29
what do gamma motor neuron do?
they stimulate contraction of muscle spindles
30
what do alpha motor neurons do?
stimulate muscle contraction
31
what is a muscle spindle?
the sensory receptor of a stretch reflex
32
which of the ramis for plexuses?
the ventral ramis
33
what is the function of a crossed extensor reflex?
promotes relaxation of extensor muscles while opposing flexor muscles contract
34
how many of each nerve are there?
8 cervical, 12 in the thoracic, 5 in the lumbar, 5 in the sacral and 1 in the coccygeal.
35
whata kind of fibers (axons) does dorsal roots ONLY consist of?
sensory
36
where do axons of sensory neurons synapse with cell bodies of interneurons?
in the posterior horn of spinal cord gray matter
37
what is the possible reason for a reflex response accompanied by conscious sensation of pain?
divergent pathways
38
what is responsible for regulating the sensitivity of the muscle spindle?
gamma motor neurons
39
what is a collection of spinal nerves that join together after leaving the spinal cord called?
a plexus
40
what are some characteristics of a dermatome? (3) (AEC)
1) area of skin supplied by a pair of spinal nerves 2) exists for each spinal nerve except C1 3) can be used to locate the site of spinal cord or nerve root damage
41
what 2 nerves combined with the same sheath make up the sciatic nerve?
common fibular (peroneal) and tibial
42
what would effect the damage to some afferent neurons of the PNS?
it would interfere with a person's ability to sense a variety of stimuli.
43
what are the basic functions of the cerebrum? (3)
1) controls conscious motor activity 2) controls thought 3) controls conscious perception
44
what is the function of the brainstem?
it's a critical center for essential survival reflexes and strong areas of destruction can be fatal
45
what are the functions of the midbrain?
1) involved in maintaining muscle tone and coordinating movements 2) reflex movements of head, eyes and body towards visual, auditory or tactile stimuli 3) aids in unconscious regulation and coordination of motor activities
46
what serves as a visual reflex center?
the midbrain
47
which cranial nerve innervates skeletal muscles of the neck and back?
accessory (XI)
48
which nerve is primarily a motor nerve with two branches; the spinal branch and the cranial branch
accessory (XI)
49
which cranial nerves are only sensory
1, 2 and 8 (vestibulochlear)
50
which cranial nerves are somatic motor and parasympathetic?
3
51
which cranial nerves are somatic motor only?
4 (trochlear), 6 (abducens), 11 (accessory) and 12
52
which cranial nerves are sensory and somatic motor?
5 (trigeminal)
53
which cranial nerves are sensory, somatic motor and parasympathetic?
7 (facial), 9 (glossopharyngeal) and 10
54
where in the brain is basal nuclei located?
1) midbrain 2) cerebrum 3) diencephalon
55
what connects parts of the cerebrum to other parts of the brain and spinal cord?
projection fibers
56
what connects areas of the cerebral cortex within the same hempisphere?
association fibers
57
what structures connect the cerebellum to the brainstem and allow communication between the cerebellum and other parts of the CNS
the peduncles
58
which cranial nerve is involved in reflexes necessary to maintain homeostasis?
vagus (X)
59
what part of the diencephalon is directly connected to the pituitary gland?
the hypothalamus
60
what area is located in the postcentral gyrus of the cerebral cortex?
the primary somatic sensory cortex
61
what is it called when water-soluble molecules of the blood plasma move across the blood-brain barrier?
symport
62
which nerves are involved in the sense of taste?
facial (VII), glossopharyngeal (IX) and vagus (X)
63
what nerve has the greatest cutaneous sensory distribution of any of the cranial nerves?
trigeminal (V)
64
what does the accessory nerve only have?
a spinal component
65
where is the excess CSF returned to?
the venous circulation
66
which portion of the spinal cord would be affected by a disease that damages myelin sheaths?
the white columns
67
if a person with polio lost use of their leg, which area of their spinal cord would you expect the virus-infected motor cell neurons to be?
in the anterior grey horns
68
what is the minimum number of neurons in a reflex arc?
2
69
which part of the brain stem contain cranial nerves V and VI and a respiratory center?
pons
70
where in the brain are basal nuclei located?
the cerebrum , medulla oblongata and midbrain
71
what is part of the epithalamus?
the pineal gland and thalamus
72
what is permeable across the BBB?
caffeine, glucose and oxygen
73
what type of reflex arc are interneurons used?
polysynaptic

A&P 223 (50 decks)

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