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ANAT 323 > lecture 22: subcortical fibers > Flashcards

lecture 22: subcortical fibers Flashcards

1
Q

what are the 3 general categories of the white matter pathways of the brain

A

commissural fibers
association fibers
projection fibers

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2
Q

connect cortical areas of the left and right hemispheres (across the midline)

what type of fibers

A

comissural

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3
Q

what do commisurral fibers connect

A

connect cortical areas of the left and right hemispheres (across the midline)

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4
Q

give an example of a commissural fibers

A

corpus calosum

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5
Q

connect cortical areas within the same cerebral hemisphere (one side of the brain)

what type of white matter fibers

A

association fibers

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6
Q

what do assication fibers connect

A

connect cortical areas within the same cerebral hemisphere (one side of the brain)

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7
Q

give an example of an association finer

A

fibers connecting occipital lobe to temporal

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8
Q

connect the cerebral cortex and subcortical structures of the CNS

what white matter fibres

A

projection fibres

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9
Q

What do projection fibers connect

A

connect the cerebral cortex and subcortical structures of the CNS

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10
Q

give an example pr projection fibers

A

corona radiate
internal capsule

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11
Q

true or false: the internal capsule white matter is considered association fibers and explain

A

false, they are projection fibers since they are connectio=ng the cerebral cortex to subcortical structures (thalamus)

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12
Q

what white matter fiber category does corpus callosum belong to (C, A, P?)

A

commissural

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13
Q

what is the largest commissural tract in the brain

A

corpus callosum

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14
Q

true or false: the corpus callosum is the the largest commissural tract in the brain

A

true

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15
Q

what are the 4 divisions of the corpus callosum

A

rostrum
splenium
body
genu

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16
Q

is rostrum of corpus callosum near pineal gland or pituirary gland

A

pituitary gland

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17
Q

is splenum of corpus callosum near pineal gland or pituirary gland

A

pineal gland

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18
Q

what connects the frontal lobes in the corpus callosum

A

forceps minor (ant forceps)

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19
Q

what connects the occipital lobes in the corpus callosum

A

forceps major

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20
Q

true or false: the forceps minor connects occipital lobe

A

false, connects the frontal lobes

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21
Q

what part of the corpus callosum makes up the forceps minor

A

genu

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22
Q

what part of the corpus callosum makes up the forceps major

A

splenium

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23
Q

splenium of the CC makes the forceps major or forceps minor

A

major

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24
Q

genu of the CC makes the forceps major or forceps minor

A

forceps minor

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25
what are the u shaped fibers in the corpus callosum connecting lobes
forceps minor and major
26
in the forceps minor more anterior or posterior
anterior
27
in the forceps major more anterior or posterior
posterior
28
what are the 4 examples of commissural fibers
corpus callus (forceps major and minor) anterior comissure posterior commissure hippocampal commisuri
29
which commisural finer connects the left and right temporal lobe
anterior commisirea
30
anterior or posterior commisural finer connects the left and right temporal lobe
anterior commissure
31
is the anterior commissure located near rostrum or selenium of CC
rostrum
32
explain how the anterior commissure contains olfactory fibers
medial olfactory stria decussates via anterior commissure to go to contralateral olfactory bulb (for localization of smells)
33
what is another name for the posterior commissure and why
epithalamic commisure
34
the psoturerior commissure is part of what structures
epithalamus and component of the inferior lamina of the pineal gland
35
olfactory fibers are involved in the anterior or posterior commissure
anterior
36
pupillary light reflex is involved with the anterior or posterior commissure
posterior (pretectal cross over in the posterior commissure)
37
explain how the posterior commissure is involved i the pupillary light reflex
the pretectal nuclei project to the bilateral accessory oculomotor nucleus and decussate via the posterior commissaire
38
what white matter fibre connects the two hippocampi
hippocampal commissure
39
ADD SLIDES ABOUT THE SPLIT BRAIN SYNDROME
40
WHAT Do short association fibers connecti
adjacent gyri
41
what are the white matter fibers that connect adjacent gyri caleld
short association fibers
42
what are 5 examples of long association fibers
cingulum superior longitudinal fasicualtus inferior longitudinal fascicles occipitofrontal fascicle uncinate fasciculi
43
cingulum superior longitudinal fasicualtus inferior longitudinal fascicles occipitofrontal fascicle uncinate fasciculi are short or long association fibers
long
44
true or false: long association fibers connect 1 lobe to another within the same hemisphere
true
45
which association fiber connects different regions of the limbic cortex
cingulum
46
what does the cingulum connect
connects different regions of the limbic cortex
47
where is the cingulum located
wraps around corpus calosum, into temporal lobe (tracts from the cingulum are within subcollasal, ci=ngulate and parrahippo)
48
wraps around corpus calosum, into temporal lobe what white matter long association fiber>
cingulum
49
tracts from the cingulum are within which gyri
subcollsoal cingulate parahippocampal
50
what is the function of the cingulum
attention, memory, emotion, homeostasis
51
attention, memory, emotion, homeostasis is assocaited with what association fiber
cingulum
52
what does the superior longitudinal fasciculus connect
connects frontal, parietal, occipital and temporal lobes
53
where is the location of the superior long fasciculus
above the insula
54
which association fiber is located above the insula
superior longitudinal
55
what is considered a subset of the superior longitdinal fascicles that is important for language
arcuate fasciuculus
56
true or false, the arcuate fascicles is a subset of the inferior longitudinal fasculus
false, of the superior
57
what is the roles of the superior longitudinal fascicles
roles in language, controlling speech, coordination of eye movements to track visual stimuli (frontal eye fields and PTO)
58
roles in language, controlling speech, coordination of eye movements to track visual stimuli (frontal eye fields and PTO) which association fiber
superior longitudinal fasciulus
59
explain how the superior longitudinal fascicles is involved in coordination of eye movements to track visual stimuli
connections from frontal eye fields and PTO to PPRF
60
what does the inferior longitudinal fasciculus connect
connects occipital and temporal lobes (ventral stream of visual processing)
61
where is the location of the inferior long fasciculus
below the insula
62
which association fiber is located below the insula
inferior longitudinal fasciulus
63
facilitates rapid transfer of visual info to limbic structures for visual memory, perception and facial recognition which association fiber
inferior longitudinal fasculusw
64
what is the function of the inferior longitudinal fasciculus
facilitates rapid transfer of visual info to limbic structures for visual memory, perception and facial recognition
65
is the occipitofrontal fasciculi in a caudal-rostral orientation or ventral dorsal
caudal rostral
66
where do the occipitofrontal fascicle carry information
from the caudal aspect of the brain (esp occipital lobe) to the prefrontal cortex
67
occipitofrontal fascicoli carry info rom the caudal aspect of the brain (esp occipital lobe) to the BLANK
prefrontal cortex
68
what is the function of the occipitofrontal fascicle
carry sensory info to the prefrontal cortex for attention, decision making and language functions
69
true or falseL the occipital frontal fascicle is decision making based on visual info
true
70
what does the uncinate fascicles connect
connects limbic structures in the temporal lobe and prefrontal cortex
71
connects limbic structures in the temporal lobe and prefrontal cortex is assocaited with what association fibers
uncinate
72
the rostral fibers of the uncinate fascicles mix with what other structure
the occipitofrontal fascicles
73
function of the uncinate fascicles
theories include episodic memory, language, and social emotional processing
74
theories include episodic memory, language, and social emotional processing function of what association fiber
uncinate
75
what is episodic memory
memory information about the time and place of an event, as well as detailed information about the event itself.
76
collection of efferent and afferent pathways connection cortical and subcortical structures is what type of white matter fibers
projection fibers
77
what are 4 examples of the projection fibers
corona radiate internal capsule external capsula extreme capsule
78
what is the corona radiate
fan-shaped white matter sheet
79
connects cortex and basal ganglia is what white matter projection fiber
external capsule
80
what does external capsule connect
connects cortex and basal ganglia
81
what does the extreme capsule connect
connects claustrum and insula
82
connects claustrum and insula is what white matter projection fiber
extreme capsule
83
what are the caudal most projections of the corona radiate
optic radiations
84
what is the primary function of the optic radiations
to carry visual info from the thalamus to the visual cortex
85
what forms the walls of the lateral ventricles
caudate
86
what forms the lateral walls of the 3rd ventricle
thalamus
87
true or false, the internal capsule is an association fiber
false, it is a projection fiber
88
where is the posterior limb of IC located
between thalamus and LF
89
what supplies the posterior limb
anterior choroidal
90
what are the fibers of the posterior limb
corticospinal corticopontine (cerebrocerebellar pathway) corticofugal (central central of extrapyramidal) 3rd order sensory fibers (thalamocortical)
91
what are the primary fibers of the genu of the IC
primarily corticonuclear fibers (and sensory info from the face)
92
where is the anterior limb located
between head of caudate and lentiform nucleus
93
what fibers are located in the anterior limb
corticopontine corticofugak other thalamocortical fibers =no voluntary of concious pathways that pass here
94
auditory and optic radiations radiate from where to where
radiate from medial and lateral geniculate nuclei to cortex
95
what radiates from medial and lateral geniculate nuclei
auditory (medial) optic (lateral)
96

ANAT 323 (25 decks)

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