Test 2: Brainstem Motor Nuclei Flashcards Preview

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Flashcards in Test 2: Brainstem Motor Nuclei Deck (45):
1

What is the difference between somatic vs branchial?

Based on embryonic origin- somatic is mesoderm origin of head/eye muscles/tongue

Somatic:
I, II, III, IV, VI, XII
Branchial:
V, VII, IX, X, XI

2

What 3 cranial nervse are not part of the corticobulbar system?

CN III, IV, VI
target eye muscles

3

CN V
CB, CB location, and target

Trigeminal motor
Pons
Muscles of mastication

4

CN VII
CB, CB location, and target

facial motor
pons
muscles of expression

5

CN IX
CB, CB location, and target

ambiguus
medulla
stylopharyngeal muscles

6

CN X
CB, CB location, and target

ambiguus
medulla
pharynx, largynx muscles

7

CN XI
CB, CB location, and target

Accessory motor
medulla/cervical
traps, SCM

8

CN XII
CB, CB location, and target

Hypoglossal
medulla
tongue

9

What do the brainstem visceromotor neurons do

all parasympathetic controlled
have pre ganglionic and post ganglionic CB that go to smooth muscles and glands

10

CN III visceromotor
Pregang, CB, post gang, and target

Ed-west
midbrain
ciliary
ciliary muscles and pupilary constrictors

11

CN VII to pterygodal
Pregang, CB, post gang, and target

superior salvitory nucleus
pons
pterygodal
lacrimal and nasal mucous

12

CN VII to submandibular
Pregang, CB, post gang, and target

superior salvitory nucleus
pons
submandibular
salivary gland

13

CN IX
Pregang, CB, post gang, and target

inferior salivary nucleus
pons/medulla
otic
parotid gland

14

CN X
Pregang, CB, post gang, and target

dorsal motor nucleus
rostral medulla
terminal
heart, lung, GI

15

What is the general pathway of corticobulbar tracts?

M1- through corona radiata- post limb - genu
Descend through midbrain ventrally by cereb pedunc
-start branching in pons down to spinal cord bilatearlly or one direction to different motor nuclei

16

Where is the trigeminal motor nucleus (V)

rostral/mid pons
-goes bilateral for facial control
-more contralateral

17

Where is the facial motor nucleus (VII)?

basis pons
-has upper and lower facial portions
-primarily contrlateral

18

Where is the hypoglossal motor nucleus (XII)?

medulla
-controls tongue
-more contrlateral

19

Where is the nucleus ambiguus (CN IX, X, sometimes XI)?

spans medulla
-primarily contrlateral
-tongue, phary/lary muscles

20

Where is the accessory nucleus (XI)?

medulla/cervical spine
-SCM/traps control
-primarily ispilateral

21

In the brainstem which motor nuclei sit medial to lateral?

Somatic most medial (except ed-west medial between III)
Broncomotor latearl to somatic
Visceral motor latearl to bronchomotor (except ed-west)

22

What branch of trigeminal nerve has brainstem nuclei control of motor function?

V3 manidbular branch
-small branchial motor divison

Controls:
jaw closers, openers for massication
middle ear to decrease chew sounds

23

Where is the CB for the trigeminal nerve

trigeminal motor nucleus

24

What is the ONLY branchial motor muscle with muscle spinlde

Jaw closers!
proprioceptive control for jaw stretch reflex

25

Where is the CB for the jaw closer stretch reflex of trigeminal?

trigeminal mesencephalic nucleus

26

What is the blood supply to the trigeminal motor nucleus

basilar and AICA

27

What is the main branch primary function of the facial nerve (VII)?

controlling facial expression
-lesser branches to jaw openers, middle ear, etc.
-muscles are derived from bronchiol arches and anchored to bone/fascia of the skin

28

Where are the motor neurons for the facial nerve?

facial nucleus in caudal pons

29

What do the motor neurons of the facial nucleus do in the caudal pons?

loop around the abducens nucleus
-creates bulge on the floor of 4th ventricl

30

What are the 5 branches of regional control for facial motor

1. temporal
2. zygomatic
3. buccal
4. mandiublar
5. cervical

31

What is the path of the eye blink reflex?

temporal/zygomatic branches of facial control used!!

free nerve ending from trigeminal innvervation of cornea-> trigeminal tanglia -> spinal trigeminal tract -> caudal spinal trigeminal nucleus
reflex part goes up to facial nucleus- out to blink obicularis oculi

32

What does the glossopharybgeal (IX) do? where is the neuron

elevate pharynx: speech, swallow, gag
-neurons rostral nucleus ambiguus

33

What does vagus (X) do? where is neurons

innervates pharygneal muscles: swallow, gag, laryngeal muscles for smeepch
-neurons in rostral nucleus ambiguus

34

What does the accesory (XI) do? Where is it located?

SCM, traps
motor neurons from C1-C3
-spinal extension of ambiguus

35

What connects nucleus ambiguus and spinal accessory nucleus?

larygneal motor neurons in medulla/SC

36

What does the hypoglossal (XII) do? Where is it located?

intrinsic tongue muscles
hypoglossal nucleus in midline rostrall medulla

37

What is the path of the swall/gag control?

touch to back wall of throat sets of:
Superior ganglia of IX glossopharyngeal-> caudal solitary tract-> caudal solitary nucleus

synapse in solitary nucleus and sends signal to:
ambiguus nucleus and hypoglossal nucleus
-to open mouth, close pharynz, and thrust tongue

38

Where are the CB for preganglionic neurons in paraympathetic divisions?

Brainstem

39

Where are the CB for postganclionic neurons in parasympathetic divisions?

close to targets in head/pelvis

40

Where are the CBs for CNIII visceromotor

pregan: Ed-West
CB: ciliary gang
post: constrictor cilliary muscle

41

Where are the CBs for CNIV visceromotor

pre: superior salicary nucleus (pons)
CB: pterygoid or submandibular
Post: lacrimal, nasal, etc.

42

Where are the CBs for IX visceromotor

pre: inferior salivary nucleus (pons-med)
CB: otic
Post: salicary glands

43

Where are the CBs for X visceromotor

pre: dorsal motor nucleus of vagus
CB: terminal ganglia
post: heart, lung, GI

44

What is the main blood supply to the pons

AICA and basilar

45

What is the main blood supply to the medulla

PICA (lateral)
vertebral (anterior)