Neuro A&P review - lec 1

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106 Terms

1
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What are the layers of a neural tube?

  • marginal (outer): develop to white matter

  • mantle (middle): develop to gray matter

  • ependymal (inner): lines brain ventricles and central canal of cord; CSF

2
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Prosencephalon is _____

forebrain

3
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Telencephalon is ______

cerebrum and basal ganglia

4
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Diencephalon is ______

thalamus and hypothalamus

5
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Mesencephalon is ______

midbrain

6
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Rhombencephalon is _____

hindbrain

7
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Metencephalon is ______

pons and cerebellum

8
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Myelencephalon is ______

medulla and spinal cord

9
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_____ develops from the neural tube (brain, spinal cord)

CNS

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_____ develops from neural crest (all neural structures outside cord)

PNS

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What prevents risk of defects of neural tube closure and can prevent spina bifida?

folic acid (400 mcg QD)

12
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How long after conception does the neural tube close?

18-26 days

13
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Which cells are only supportive, without electrical excitability, and can’t multiply?

glial cells

14
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Which cells are large, single axon, electrically excitable, post mitotic and non dividing?

neurons

15
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Which type of glial cell is the most abundant, attaches to nerves + blood vessels anchoring neurons to capillaries, involved in ion (K+) transfer and is an integral part of the BBB?

astrocytes / spider cells

16
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Which type of glial cells wrap around axons in the CNS to form myelin sheath, providing insulation and enhancing electrical impulses?

oligodendrocytes

17
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which type of glial cells are mobile throughout the CNS and function as macrophages and perform phagocytosis (immune system)?

microglia

18
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Which type of glial cells line ventricles and canal of the spinal cord, secreting CSF?

ependymal cells

19
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Which type of glial cells wrap around axons in the PNS forming myelin sheath and have phagocytic activity?

Schwann cells

20
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What connects the left and right cerebral hemispheres, enabling messages to be delivered between the two halves?

corpus callous

21
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What is the 5th lobe of the brain called?

insula

22
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Which lobe is responsible for behavior, emotions, problem solving, planning & attention, and contains primary motor region on the pre central gyrus?

frontal lobe

23
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Which lobe is responsible for speech, language and hearing decoding, short term memory, identification of smell?

temporal lobe

24
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A tumor in which lobe of the brain would cause olfactory hallucinations?

temporal lobe

25
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Which lobe of the brain is responsible for touch, and contains the primary sensory region on the post central gyrus?

parietal lobe

26
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A lesion in which area of the brain would cause sensory deficits of astereognosis, hemispatial neglect, and inability to copy figures?

parietal lobe

27
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Precentral gyrus is the primary ______ region; postcentral gyrus is the primary ______ region

motor ; sensory

28
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Which lobe is responsible for visual processing, shape and color identification?

occipital lobe

29
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Which area of the brain coordinates motor activity such as starting, stopping, and monitoring the intensity of movements?

Basal Ganglia

30
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A lesion in which area of the brain would cause movement disorders, tremors and other extrapyramidal syndromes (EPS)?

basal ganglia

31
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What clinical syndrome of the basal ganglia is from loss of dopaminergic neurons in the substantial nigra & is associated w/ rigidity, bradykinesia, tremors and loss of postural reflexes?

Parkinsonism

32
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What clinical syndrome of the basal ganglia is associated with damage to the contralateral subthalamic nucleus of Luys?

Hemiballismus (hemichorea)

33
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What clinical syndrome of the basal ganglia is a hereditary disease of progressive dementia and chorea, associated w/ atrophy of the caudate nucleus?

Huntington’s chorea

34
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What area of the brain?

  • major sensory relay & translates impulses related to pain, attention, and alertness (all sensory input except olfactory)

  • has profound influence on cognitive function and motor via input from basal ganglia and cerebellum

thalamus

35
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what area of the brain?

  • integral part of endocrine system controlling pituitary functions

  • master control for ANS aiding in blood glucose levels, HR and RR during stress, temperature, hunger, thirst, sleep-wake cycle, etc

hypothalamus

36
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What are the functions of the limbic cortex?

emotion (amygdala + cingulate gyrus) and memory (hippocampus)

37
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Which area of the brain arises from vestibular nuclei, maintaining control over balance and coordination?

cerebellum

38
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Proprioceptors from limbs and trunk go to which area of cerebellum?

anterior lobe

39
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Messages from cerebrum, motor cortex, and corticospinal tract go to which area of cerebellum?

posterior lobe

40
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what is toxic to the cerebellum, poisoning the vestibulocerebellar neurons?

alcohol

41
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What are the three regions of the brain stem?

midbrain, pons, medulla oblongata

42
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Which area of the brain?

  • conduction pathway b/t higher and lower brain centers

  • visual and auditory reflex centers (superior/inferior colliculi)

  • subcortical motor centers (substantial nigra and red nuclei)

  • contains nuclei for CN III and IV

midbrain

43
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Which area of the brain?

  • conduction pathway b/t higher and lower brain centers

  • respiratory nuclei (work w/ medullary resp centers) to control resp rate and depth

  • contains nuclei for CN V-VII

pons

44
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Which area of the brain?

  • conduction pathway b/t higher brain centers and spinal cord

  • site of decussation of pyramidal tracts

  • nuclei of CN VIII-XII

  • contains nuclei cuneatus and gracilis

  • contains visceral nuclei controlling HR, RR, vessel diameter, vomiting, coughing

medulla oblongata

45
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How far does the spinal cord extend?

from medulla to 1st or 2nd lumbar vertebra

46
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What are the sensory pathways of the spinal cord?

spinothalamic tracts and dorsum columns (medial lemniscus pathway)

47
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what are motor pathways of the spinal cord?

corticospinal tracts

48
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Which roots travel the longest, fanning out like a horse tail forming the cauda equina?

lumbar and sacral

49
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DTRs are ______

monosynaptic

50
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How do DTRs work?

tap tendon → activates sensory fibers in partially stretched muscle → triggers sensory impulse that travels from peripheral nerve to spinal cord → sensory fiber synapses w/ anterior horn cells → impulse crosses NMJ → muscle contraction

51
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Descending or ascending tracts?

  • motor pathways

  • pyramidal / direct / corticospinal

  • extrapyramidal / indirect

descending

52
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Descending or ascending?

  • sensory pathways

  • dorsal column- medial lemniscal pathways

  • anterolateral / spinothalamic

  • spinocerebellar pathways

ascending

53
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What tract is pain and temperature?

lateral spinothalamic tract

54
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What is the pain and temperature neural pathway?

1st neuron: sensory receptor to dorsal horn

2nd neuron: dorsal horn to lateral spinothalamic tract to thalamus

3rd motor neuron: thalamus to brain

55
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A lesion on the RIGHT side at T5 will lose pain and temperature sensation where?

CONTRAlateral and BELOW

(Left side @T5 and below)

56
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What tract is associated with light touch and pressure?

Anterior spinothalamic tract

57
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What is the light touch and pressure neural pathway?

1st order neuron: sensory receptor to dorsal horn

2nd order neuron: dorsal horn to ant. Spinothalamic tract to the thalamus

3rd order neuron: thalamus to the brain

58
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Discriminative touch, vibration and proprioception are what tract?

Dorsal white column

(Fascicles cuneatus and gracilis)

59
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What is the vibration/proprioception/discriminative touch neural pathway?

1st order neuron: sensory neuron to dorsal white column to the medulla

2nd order neuron: medulla to thalamus

3rd order neuron: thalamus to brain

60
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Where does vibratory sense/proprioception/discriminative touch synapse?

medulla (I/L)

61
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Where does pain/temp / light touch / pressure synapse?

spinal cord (C/L)

62
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____ neurons are involved for sensory function; ______ neurons are involved for motor function

3 ; 2

63
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where do corticospinal tracts (motor) crossover?

lower medulla

64
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where do the UMN and LMN synapse?

anterior gray horn

65
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A lesion on the RIGHT side of T5 will lose vibratory sense where?

IPSILATERAL and BELOW the lesion

RIGHT side and below T5

66
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Which motor pathway provides control of voluntary movements with neurons passing through medullary pyramids?

pyramidal motor pathways

67
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Which motor pathway provides automatic/involuntary control and coordination through the cerebellum and basal ganglia?

extrapyramidal motor pathways

68
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Motor neurons that connect the cerebral cortex to the spinal cord are ____

upper motor neurons

69
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Motor neurons that connect the spinal cord to the target muscle are ______

lower motor neurons

70
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Motor pathway damage to UMN?

  • bulk- normal til disuse atrophy

  • tone- inc (except in spinal shock → flaccid + recovers in 2 wks)

  • power- dec; tends towards normal over time if adequate stimulation maintained

  • fasciculations NOT commonly seen

  • reflexes- brisk

  • plantar/babinski- up going

71
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Motor pathway damage to LMN?

  • bulk- prominent weakness and atrophy early

  • tone- always hypotonia!

  • power- severely dec

  • fasciculation d/t degenerative process

  • reflexes- dec or absent

  • plantar/babinski- downgoing

72
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Where does the arterial supply to the brain come from?

bilateral internal carotid and bilateral vertebral arteries

73
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which artery feeds the trunk, legs, feet, and genitals?

anterior cerebral artery

74
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Which artery feeds the hands, arms, face, and tongue?

middle cerebral artery

75
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Protection of the brain from out to in?

Scalp

Connective tissue

Aponeurosis

Loose connective tissue

Periosteum (bone of cranium)

76
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What membranes protect the CNS?

meninges

  • dura mater: outer layer

  • arachnoid mater: lies above subarachnoid space

  • pia mater: delicate inner layer directly covers brain

77
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Blood between the inner surface of the skull and the dura is known as _______

epidural hematoma / arterial blood

78
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Blood between the dura and arachnoid is known as _______

subdural hematoma / venous blood

79
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blood below the arachnoid (& above Pia) is known as _____

subarachnoid hemorrhage

80
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How should CSF appear?

clear, colorless, few cells, and little protein

81
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Which system has SHORT preganglionic neurons that release ACh and LONG postganglionic neurons that release NE?

sympathetic

82
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Which system has LONG preganglionic neurons and SHORT postganglionic neurons that both release ACh?

parasympathetic

83
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SNS regulates ________

glands, smooth muscle, cardiac muscle

84
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Parasympathetic nervous system regulates ______

sexual arousal, salivation, lacrimation, urination, digestion, defecation

85
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Epi/NE is with _______ ; ACh is with ______

SNS ; ANS

86
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What neurotransmitter affects cholinergic receptors (nicotinic & muscarinic), has fewer receptors on the brain, is the primary neurotransmitter of the PNS and has a role in arousal, attention, and motivation?

Ach

87
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What syndrome arises when drugs blocks Ach in the CNS and PNS?

  • blind as a bat (dilated pupils)

  • red as a beet (vasodilation/flushing)

  • hot as a hare (hyperthermia)

  • dry as a bone (dry skin)

  • mad as a hatter (hallucinations/agitation)

  • bloated as a toad (ileum, urinary retention)

  • heart runs alone (tachy)

anticholinergic syndrome

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What are the glutamate receptors?

NMDA and non-NMDA (AMPA)

89
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The main stimulatory neurotransmitter is ______

glutamate

90
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What neurotransmitter is believed to contribute to pathogenesis of Alzheimers through overstimulation, is associated with excitotoxicity, and has been implicated in epileptic seizures?

Glutamate

91
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The most addictive drugs increase what neurotransmitter activity?

dopamine

92
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What neurotransmitter?

  • secreted from substantia nigra

  • selective inhibitor (reduce muscle contraction)

  • produces arousal

  • involved in executive function, motor control, motivation, reinforcement and reward, lactation, sexual gratification, and nausea

  • L-DOPA precursor synthesized in brain and kidney

Dopamine

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What would happen if there is damage to the substantia nigra?

loss of dopamine secreting neurons → not enough dopamine → too much inhibition of spontaneous movement (cog wheel rigidity, not smooth) → parkinsons

94
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What is the treatment for parkinsons?

L-DOPA (bc it can cross BBB)

administer w/ carbidopa to prevent conversion to dopamine before crossing BBB

95
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Schizophrenia is thought to be due to overstimulation of what receptors in the cerebral cortex?

dopamine / D2 (tx w/ dopamine antagonists)

96
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What neurotransmitter?

  • synthesized from tryptophan

    • levels controlled by uptake of tryptophan and intraneuronal MAO

  • controls appetite, sleep, mood, behavior, muscle contraction, endocrine regulation

  • contributes to feelings of well being and happiness

serotonin

97
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A decrease of what neurotransmitter would cause migraine HAs by allowing for dilation of blood vessels in the brain?

serotonin

98
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Which neurotransmitter influences anxiety and impulsive behavior, causing some patients w/ low levels to attempt suicide by dramatic means?

serotonin

99
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The main inhibitor neurotransmitter is ______

GABA

100
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Which neurotransmitter has been implicated in seizures?

Both GABA and Glutamate