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BMB 2 Leesy > B7.026 - Brain Stem > Flashcards

B7.026 - Brain Stem Flashcards

1
Q
A
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2
Q

specialization of rostral segments of brain stem

A

endbrain - CN 1,2

midbrain - CN 3,4

pons - CN 5, 6, 7, 8

Medulla - CN 9,10,11,12

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3
Q

compare and contrast dorsal neural tube in the spinal cord vs the brain stem

A

what was rostral in the spinal cord becomes lateral in the brainstem

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4
Q

describe the overall organizatio of the brainstem

A

the tectum makes up the “roof: of the brain stem

then follows the central canal/tegmentum, midbrain, basis, pons, medulla

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5
Q

3 layers of the brain stem

A

motor, sensory, nuclear (from most ventral to dorsal

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6
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A
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7
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8
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9
Q

SE

SVE

GVE

VA

GSA

SSA

A

Somatic afferents

Special visceral efferents

general visceral efferents

visceral afferents

general somatic afferents

special somatic afferents

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10
Q

CN 3

A

oculomotor

Midbrain

SE and GVE

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11
Q

eye movement CNs

A

Oculomotor (CN3)
trochlear (CN4)

abducens (CN6)

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12
Q

hypoglossal nerve innervation

A

motor to intrinsics of the tongue (CN 12)

medulla

SE

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13
Q

trochlear nerve

A

CN 4

Midbrain

eye movements

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14
Q

abducens nerve

A

CN 6

Pons

extraocular muscles/eye movement

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15
Q

GSA tracts

A

midbrain - mesencephalic (unconcious propioception/spindles)

pons - proper (fine touch/proprioception Jaw)

pons/medulla - descending (pain and temp)

cervical/thoracic/lumbar - somatic afferents

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16
Q

somatic sensory nerves

A

mostly via trigeminal

3 divisions:

V1 - opthalmic (to vertex of skull)

V2 - maxillary

V3 - mandibular

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17
Q

general visceral afferents vs special visceral afferents

A

general (solitary)

  • carotid body
    • baroreceptors and chemoreceptors (IX)
  • aortic arch
    • baroreceptors and chemoreceptors (X)

Special (gustatory)

  • anterior 2/3 of tongue
    • sensory: V3 of 5
    • Taste: chorda tympani branch of CN 7 lingual branch
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18
Q

SVE in cervical SC

A

accessory nucleus of CN 11 to SCM and trapezius

19
Q

trigeminal motor nucleus

A

masticatory muscles

masseters, temporalis, pterygoid and tensor tympani

20
Q

facial nucleus

A

facial muscles

from CN 7

21
Q

CN 3 location and fxn

A

oculomotor

midbrain

SE oculomotor

GVE pupillomotor

Fxn:

medial, sup, inf rectus, inf oblique, lev palbebrae, pupil constriction

22
Q

trochlear nerve location and fxn

A

CN 4

midbrain

superior oblique

23
Q

abducens nerve location and fxn

A

CN 6

pons

lateral rectus

24
Q

testing extraocular muscles

A
25
Q

trigeminal nerve location and fuction

A

CN 5

pons

muscles of mastication, sensation to face, mouth

26
Q

facial nerve location and function

A

Pons

face muscles, stapedius, digastric

taste and ant 2/3 tongue

ear rgion sensation

lacrimal, submandibular and sublingual gland

27
Q

vestibulocochlear location and function

A

pons/medulla

CN 13

Hearing

vestibular

28
Q

glossopharyngeal nerve location and function

A

CN 9

medulla

Stylopharyngeus

taste post 1/3 of tongue

sensation post pharynx and ear region

carotid

parotid gland

29
Q

vagus nerve location and function

A

medulla

CN 10

pharyngeal muscles

laryngeal muscles

sensation pharynd and ear region

aortic arch baro/chemo receptors

parasympathetic to viscera

30
Q

spinal accessory nerve location and fucntion

A

CN 11

trapezius and sternocledomastoid

medulla and nucleus in cervical SC

31
Q

hypoglossal nerve location and function

A

medulla

CN 12

intrinsic tongue muscles

32
Q
A
33
Q

gag reflex

A

stimulation of posterior oropharynx - CN 9

palatal elevation - CN 10

medullary induced

34
Q
A
35
Q

corneal reflex

A

assocated with pons

afferent - CN 5 (sensation)

efferent - CN 7 (eye closure)

Crossed - bilateral eye closeure

36
Q
A
37
Q

pupillary light reflex

A

midbrain

CN 2 and 3

38
Q

orientation of internal capsule

A
39
Q

corticobulbar innervation facial nerve presentation if lost

A

bilateral upper

contralateral lower

40
Q

corticobulbar innervation of motor N 5

A

bilateral

muscles of mastication

41
Q

UMN lesion of bulbar motor nuclei

A

pseudobulbar

42
Q

LMN lesion of bulbar motor nuclei

A

bulbar

43
Q
A

BMB 2 Leesy (5 decks)

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