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CNS > [HISTO] BRAINSTEM > Flashcards

[HISTO] BRAINSTEM Flashcards

1
Q

central canal still found in

A

closed medulla

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2
Q

central canal replaced by 4th ventricle in

A

open medulla

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3
Q

rostral part of medulla

A

open medulla

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4
Q

caudal part of medulla

A

closed medulla

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5
Q

pyramidal decussation of medulla

A

corticospinal decussation

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6
Q

sensory decussation of medulla

A

internal arcuate fibers (medial lemniscus, G&C)

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7
Q

spinal nucleus of trigeminal replaces

A

substantia gelatinosa

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8
Q

descending spinal trigeminal tract replaces

A

Lissaure’s tract

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9
Q

core of medulla is formed by

A

RF

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10
Q

internal features of medulla (6)

A

1-pyramidal decussation
2-sensory decussation
3-V spinal nucleus replaces substantia gelatinosa
4- V spinal tract replaces Lissaure’s tract
5- 4th ventricle appearance
6-RF forms core of medulla

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11
Q

2% of corticospinal fibers descend in

A

anterolateral funiculus

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12
Q

90% of corticospinal fibers descend in

A

lateral funiculus

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13
Q

90% of corticospinal fibers form

A

lateral corticospinal tracts

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14
Q

2% of corticospinal fibers form

A

anterolateral corticospinal tracts

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15
Q

8% of corticospinal fibers form

A

anterior corticospinal tract

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16
Q

function of motor decussation

A

voluntary motor control by contralateral cortex

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17
Q

G&C nuclei location?
G&C tract location?

A

dorsal aspect of medulla
posterior to nuclei

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18
Q

course of sensory decussation

A

myelinated fibers join to form internal arcuate fibers–>decussate & ascend–>medial lemniscus>VPLN

Gracile= MEDIAL
sacral= ANTERIOR

Cuneate= LATERAL
cervical=POSTERIOR

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19
Q

nuclei of medulla

A

9-12th nuclei
accessory cuneate nuclei
arcuate nuclei
olivary nuclear complex
RF nuclei

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20
Q

accessory cuneate nucleus site

A

lateral to cuneate n

21
Q

arcuate nucleus site

A

anterior aspect of pyramid

22
Q

arcuate nuclei represents

A

caudally displaced pontine nucleui

23
Q

accessory cuneate receives fibers from?
sends fibers to?

A

cervical & thoracic spinal ganglia
ipsilateral cerebellum

24
Q

accessory cuneate nucleus forms

A

dorsal external arcuate fibers (cuneaocerebellar)

25
Q

arcuate nucleus fibers form

A

anterior external arcuate fibers

26
Q

dorsal external arcuate fibers

A

accessory cuneate fibers

27
Q

anterior external arcuate fibers

A

arcuate fibers

28
Q

function of accessory cuneate nucleus

A

unconscious proprioception of UL & neck

29
Q

nucleus which is equivalent to Clarke’s nucleus

A

accessory cuneate nucleus

30
Q

arcuate nucleus function

A

receives afferents from cortex, sends to cerebellum

31
Q

trigeminal spinal nucleus site

A

medial to tract

32
Q

trigeminal spinal nucleus afferents

A

from trigeminal spinal tract

33
Q

spinal trigeminal tract originates from

A

trigeminal spinal ganglion

34
Q

trigeminal spinal tract terminates in

A

trigeminal spinal nucleus

35
Q

function of spinal trigeminal tract + nucleus

A

carry pain + temp of face & mucous membranes of face

36
Q

course of spinal trigeminal tract

A

originates from trigeminal spinal ganglion–>cross and ascend as trigeminal leminscus—> VPMN–>cortex

37
Q

types of arcuate fibers in closed medulla

A

internal arcuate
anterior external arcuate
dorsal external arcuate

38
Q

RF controls

A

muscle activity
somatic + visceral sensations
autonomic + endocrine nervous systems
arousal + consciousness

39
Q

lesion of RF leads to

A

loss of consciousness & death

39
Q

lesion of RF leads to

A

loss of consciousness & death

40
Q

internal features of open medulla

A

Hypoglossal trigone
Vagal trigone
appearance of 4th ventricle
appearance of ICP
appearance inferior olivary complex

41
Q

RF afferents

A

spinal cord
cortex
DCNs

42
Q

RF efferents

A

ascending: central tegmental–> thalamus

descending: reticulospinal–>spinal cord

43
Q

inferior olivary complex consists of

A

principal inf olivary nucleus
medial accessory nucleus
dorsal accessory nucleus

44
Q

inferior olivary complex afferents

A

cortex
spinal cord
red nucleus
BS: vestibular nucleus+ spinal of V

45
Q

inferior olivary efferent

A

olivocerebellar–> cerebellum
via ICP
end as climbing fibers= (+)purkinje

46
Q

olivocerebellar fibers function

A

motor learning

47
Q

afferents of ICP (7)

A

posterior spinocerebellar
cuneocerebellar
anterior external arcuate
vestibulo-cerebellar
reticulo-cerebellar
olivo-cerebellar
para-olivo-cerebellar

CNS (29 decks)

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