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Flashcards in brainstem Deck (25):
1

sympathetic NS cell bodies located in

spinal cord: thoracic + lumbar and synapse with sympathetic ganglia (outside spinal cord)

2

parasympathetic NS cell bodies located in

rostral medulla - dorsal motor nucleus (CN 10)

3

ptosis + anhidrosis (causes flushing) + miosis is called

Horner syndrome
related to sympathetic innervation of face

4

Horner syndrome can be caused by

pancoast tumor - compresses sympathetic trunk from thoracic spine to face
stroke of lateral medulla (PICA)
late stage syringomyelia
Brown--Sequard syndrome -cord hemisection

5

decussation of corticospinal tract

caudal medulla

6

decussation of dorsal column-medial lemniscus

medulla

7

decussation of spinothalamic tract

anterior white commissure of spinal cord

8

artery that supplies the inferior cerebellar peduncle + nucleus ambiguus + lateral spinothalamic tract in LATERAL medulla

PICA - posterior inferior cerebellar artery

9

artery that supplies the medullary pyramids and medial lemniscus in the MEDIAL medulla

ASA - anterior spinal artery

10

artery that supplies the medial longitudinal fasiculus (MLF) + corticospinal tract + medial lemniscus in MEDIAL pons

basilar artery + paramedian/median branches

11

artery that supplies the lateral spinothalamic tract in the LATERAL pons

AICA - anterior inferior cerebellar artery

12

decussation of corticospinal tract

medulla

13

decussation of spinothalamic tract

anterior white commissure of spinal cord (2-3 spinal levels above where it entered the spinal cord)

14

lesion of the medial longitudinal fasciculus (MLF) causes

ispilateral internuclear opthalmoplegia: deficit of eye tracking with lateral gaze

15

causes of MLF lesion (internuclear opthalmoplegia)

multiple sclerosis (

16

what causes:
ipsilateral medial rectus palsy with contralateral gaze (can't adduct ipsilateral eye)
contralateral horizontal nystagmus with contralateral gaze

lesion of MLF: internuclear opthalmoplegia

17

causes of "locked-in syndrome"

basilar artery stroke - both sides of superior pons affected
rapid correction of hyponetremia causes central pontine myelinolysis (loss of myelin - increased MRI signal)

18

what syndrome is this:
preserved consciousness + blinking
quadriplegia
loss of voluntary facial, mouth, tongue movements

locked-in syndrome - basilar artery stroke (affects lower midbrain, pons, medulla - corticobulbar + corticospinal tracts)

19

what causes:
ipsilateral internuclear opathalmoplegia (most common)
paralysis of gaze to side of lesion (look away from lesion)
contralateral spastic hemiparesis
contralateral loss of vibration, fine touch, proprioception

medial pontine syndrome (paramedian br. of basilar artery)
ipsilateral internuclear opathalmoplegia (most common): ipsilateral MLF
paralysis of gaze to side of lesion (look away from lesion): PPRF (next to MLF)
contralateral spastic hemiparesis: corticospinal tract
contralateral loss of vibration, fine touch, proprioception: medial lemniscus tract

20

lesion of the medial longitudinal fasciculus (MLF) causes

ispilateral internuclear opthalmoplegia:
deficit of eye tracking with lateral gaze
no crosstalk between CN 6 + CN 3

21

causes of MLF lesion (internuclear opthalmoplegia)

multiple sclerosis (demyelination) (

22

what causes:
ipsilateral medial rectus palsy with gaze away from lesion (can't adduct ipsilateral eye)
contralateral horizontal nystagmus with gaze away from lesion (CN 6 overfiring to stimulate CN 3)
normal convergence

lesion of MLF: internuclear opthalmoplegia

23

nucleus that provides:
sensory from pharynx, trachea, esophagus
taste sensation of very back of tongue
baroreceptor + chemoreceptor info from carotid sinus/carotid body
gut distention

nucleus solitarius (CN 10 nuclei) = Sensory

24

nucleus that provides:
motor to larynx, pharynx, + upper esophagus
speech + swallow

nucleus aMbiguus (CN 10 nuclei) = Motor

25

nucleus that provides:
parasympathetic innervation of upper GI, heart, lung

dorsal motor nucleus (CN 10 nuclei)

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