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[ANAT] THALAMUS Flashcards

1
Q

sensations relayed by thalamus

A

all except smell

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2
Q

which systems’ impulses does the thalamus relay

A

motor & limbic

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3
Q

anterior end of thalamus lies in relation to

A

posterior to interventricular foramen of monro

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4
Q

posterior end of thalamus expands and forms

A

pulvinar

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5
Q

thalamus is a gateway for

A

cerebral cortex

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6
Q

superior surface of thalamus is related to

A

choroid plexus

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7
Q

superior surface of thalamus forms

A

floor of lateral ventricle

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8
Q

inferior surface of thalamus is separated from subthalamus & hypothalamus by

A

hypothalamic sulcus

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9
Q

medial & lateral geniculate bodies are found in

A

posterior part of inferior surface

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10
Q

medial surface of thalamus forms

A

lateral wall of 3rd ventricle

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11
Q

both medial surfaces of thalamus are joined together by

A

interthalamic adhesion (connexus)

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12
Q

lateral surface of thalamus is separated from lentiform nucleus by

A

posterior limb of internal capsule

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13
Q

thalamic nuclei are divided into 3 groups by

A

internal medullary lamina

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14
Q

anterior nuclei receives afferents from

A

mammillary bodies via mammillo-thalamic tract

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15
Q

anterior nuclei sends afferents to

A

cingulate gyrus via anterior thalamic radiation

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16
Q

function of anterior nuclei

A

part of limbic system;
involved in emotions & short term memory

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17
Q

nuclei which forms a part of the papez circuit

A

anterior nucleus

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18
Q

medial nuclei receives afferents from

A

limbic system; hypothalamus, olfactory cortex
amygdala

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19
Q

medial nuclei sends efferents to

A

prefrontal cortex via medial forebrain bundle

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20
Q

function of medial nuclei

A

part of limbic system; involved in thinking & mood

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21
Q

metathalamus consists of

A

medial geniculate body
lateral geniculate body

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22
Q

medial geniculate body recieves afferents from

A

inferior colliculus

23
Q

lateral geniculate body receives afferents from

A

optic tract

24
Q

lateral geniculate body sends efferents to

A

area V1 of cortex

25
medial geniculate body sends efferents to
areas A1,A2 of cortex
26
non specific nuclei include
midline nucleus intralaminar nucleus reticular nucleus
27
site of midline nuclei
beneath ependyma ventricle on medial surface of thalamus
28
midline nuclei receive afferents from
reticular formation (brainstem)
29
midline nuclei send efferents to
entire cortex
30
function of midline nuclei
part of RAS; alertness increase activity of cerebral cortex
31
reticular nuclei receive afferents from
entire cerebral cortex
32
reticular nuclei send efferents to
thalamic nuclei
33
function of reticular nuclei
inhibits thalamic nuclei during sleep
34
arterial blood supply of thalamus
posteromedial group of PCA=medial &anterior parts posterolateral group of PCA=lateral & posterior parts
35
posterolateral group of PCA is
thalamogeniuclate artery
36
venous drainage of thalamus
thalamostriate vein
37
thalamic syndrome
vascular lesion of thalamogeniculate artery leads to: -decreased pain threshold -overreaction to painful stimuli -spontaneous pain
38
dorsal tier of thalamus include
lateral-dorsal nucleus lateral-posterior nucleus palvinar
39
dorsal tier receives afferents from
other thalamic nuclei
40
dorsal tier sends efferents to
sensory association area
41
ventral tier of thalamus include
VAN ventral-anterior nucleus VLN (is the ventral-intermediate) ventral-lateral nucleus VPN ventral-posterior nucleus -VPLN -VPMN
42
VAN afferents
basal ganglia, from globus pallidus
43
VAN efferents
supplementary motor area
44
function of VAN
relays motor circuits
45
VLN afferents
cerebellum, from dentate nucleus via dentato-thalamic tract
46
VLN efferents
area 4, area 6
47
function of VLN
relays motor planning of voluntary movements
48
VPLN afferents
medial & spinal leminsci
49
VPLN efferents
body area of postcentral gyrus (upper 2/3)
50
VPMN afferents
trigeminal lemniscus solitario-thalamic tract
51
VPMN efferents
head area of postcentral gyrus (lower 1/3)
52
dorsal part of diencephalon includes
thalamus metathalamus epithalamus
53
ventral part of diencephalon includes
hypothalamus subthalamus

CNS (29 decks)

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