11 Brainstem and Corticobulbar Pathways - B Flashcards Preview

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Flashcards in 11 Brainstem and Corticobulbar Pathways - B Deck (50)
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1

*What CN is only associated with the medulla

CN 9, 10, 12

2

*What is the pathway of the accessory n

Located in spinal cord from C1-6 —> foramen magnum —> out jugular foramen

3

*Lesions of the CN 11 root cause what

-drooping of the shoulder -scapular winging -turning of head to contralateral side

4

*Axons of MN pass anteriorly in medulla along lateral aspects of medial lemniscus and the pyramid as what CN

CN 12 via the hypoglossal canal

5

*The hypoglossal n distributes to what mm

Intrinsic tongue mm, hyoglossus, palatoglossus, genioglossus

6

*The dorsal motor nucleus of vagus is primarily innervation to what

-parasympathetic preganglionic to visceral structures of trachea, bronchi, heart, and GI up to splenic flexure

7

*The nucleus ambiguus innervate what

Pharyngeal and laryngeal targets Skel M in upper half of esophagus

8

Somatic afferent (pain & thermal) from a small area of ear, part of the external auditory meatus, dural of the posterior cranial fossa come from what CN

Vagus

9

Central processes of the vagus (visceral afferent and taste) enter via

Solitary tract and terminate in teh surrounding caudal solitary nucleus

10

A lesion of the root of the vagus can cause what symptoms

-dysphagia -dysarthria -very few taste defects (laryngeal, epiglottis, posterior most tongue)

11

*Glossopharyngeal n motor fibers originate from

Inferior salivatory nucleus and nucleus ambiguus

12

*What does the CN 9 part of nucleus ambiguus o

SE (to stylopharyngeus m) Plays a minor role in the efferent limb of gag reflex

13

The glossopharyngeal n lesions causes what

-diminished taste on posterior tongue -loss of stylopharngeus which participates in gag refelx

14

Glossopharyngeal neuralgia is

Intense idiopathic pain along the sensory distribution of the n

15

*What are the CN at the pon-medulla junction

CN 6, 7, 8

16

What exits along the caudal edge of the pons

CN 6, 7, 8

17

The facial motor nucleus follows what path

Arch around the abducens nucleus to exit brainstem

18

*SE fibers from the facial motor nucleus are joined by axons from

Superior salivatory nucleus (VE pre-gang para)

19

*The facial n emerges from the brainstem as what

Facial n fibers and intermediate n fibers

20

What does the facial n provide sensory innervation for

-taste fibers for anterior 2/3 of tongue -cutaneous sensory (SA) fibers from external ear (posterior 1/2 of pinna) and external auditory canal

21

Taste fibers enter _______ and terminate rostrally in _____________

Solitary tract; gustatory nucleus of solitary nucleus (the central receiving area for all taste sensation)

22

Facial n sensory fibers to the ear and external auditory canal reach cell bodies in the _________ and their central processes enter _____________ and terminate in ____________

Geniculate ganglion; spinal trigeminal tract; spinal trigeminal nucleus

23

*The nucleus of the abducens (CN 6) is surrounded by

Internal genu of facial n

24

SE motor neurons of CN 6 innervate _________________ while interneurons send axons to ___________________

Ipsilateral lateral rectus m; contralateral axons to medial longitudinal fasiculus (target contralateral occluomotor nucleus)

25

Injury of CN6 in the pons causes

Paralysis of ipsilateral LR muscle *opposite eye adducts b/c interneurons are intact

26

A lesion of the abducens nucleus causes

Paralysis of of LR ipsilaterally and failure of contralateral medial rectus m to contract toward the side of the lesion

27

***Damage to the medial longitudinal fasiculus causes

Inability to adduct the contralateral eye on attempted gaze contralaterally ***need to fact check this

28

CN of the midbrain include

CN 3, 4

29

*Where are CN 3,4 in relation to the periaqueductal gray

Ventral

30

CN 3, 4 are exclusively

Motor