15: Motor Cranial Nerves

Question 1

name the motor cranial nerves

Answer 1

V, VII, XI, X, XI, XII

3, 4, 6 COVERED IN ANOTHER LECTURE BUT ALSO HAVE MOTOR FUNCTIONS

Question 2

muscles of mastication, tensor tympani muscle

Answer 2

CN V -trigeminal-Motor Nucleus of V

Question 3

muscles of facial esxpression, stepedius muscle

Answer 3

CN VII- Facial- Facial N.

Question 4

lacrimal and all salivary glands except the parotid

PARASEYMPATHETIC

Answer 4

CN VII- Nervus Intermedius (facial)- superior salivatory nucleus

Question 5

Stylopharyngeal muscle- popping ears?

Answer 5

CN IX- glossopharyngeal- nucleus ambiguus

Question 6

parotid gland salivation

PARASYMPATHETIC

Answer 6

CN IX, lesser petrosal n, inferior salivatory

nucleus

Question 7

PHARYNGEAL muscles (swallowing), laryngeal muscles voice

Answer 7

CN X , Vagus, nucleus ambiguus

Question 8

Heart Lung, GI tract

PARASYMPATHETIC

Answer 8

CN X vagus, dorsal motor nucleus of X

Question 9

sternocleidomastoid muscle, trapezius

Answer 9

CN XI, spinal accessory Nerce, spinal accessory nucleus

Question 10

intrinsic tongue muscles

Answer 10

CN XII, hypoglossal, hypoglossal nucleus

Question 11

motor fibers of CN V travel with _______ to exit the cavlarium at _______, to innvervate

Answer 11

V3 (mandibular fibers

foramen ovale

muscles of mastication including masseter and temporalis

Question 12

CN V exits bstem @

Answer 12

mid pons level with motor fibers traveling in the V 3 mandiublar branch

Question 13

CN V exits calvarium via

Answer 13

foramen ovale

Question 14

sensory fibers in CN V synapse in the

Answer 14

mesenphalic nucleus–then short interneuron to motor nucleus of V-contraction

Question 15

motor fibers of V innervate which muscles

Answer 15

Temporalis
Masseter
Tensor Typani (dampens sound)
mylohyopid (elevates hyoid_
Anterior Belly of Digastric

Question 16

2 nuclei serving the CN VII

Answer 16

motor-facial nucleus -mid pons
Parasympathetic- superior salivary nucleus -midline of rostral medulla-pregang PANS
*both out with CN VII

Question 17

Facial Nerve Motor serves_____

Answer 17

facial expression muscles, stapedius muscle

Question 18

superior salivary nucleus serves

Answer 18

lacrimal gland and submandibular gland for salivaiton

Question 19

Facial nucleis exits via the

Answer 19

facial nerve

Question 20

superior salivayr nucleus exits as

Answer 20

nervus intermedius and joins with CN VII to synapse in several ganglia

Question 21

PANS fibers running with seven synapse on which ganglia

Answer 21

sphenopalatine/ pterygopalatine ganglion as well as the submandibular ganglia

Question 22

CN VII and Nervus intermedius exit b stem @

Answer 22

pontomedullary junciton-cerebellopontine angle

so does VI but VI is more medial

Question 23

before exiting at the dorsal pontomedullary junction-CN VII fibers…

Answer 23

turn medially and dorsally and pass over the Abducent nucleus creating the facial colliculus-caudal to the sup.inf colliculi

Question 24

what makes up the facial colliculus

Answer 24

BULDGE IN THE FLOOR of the 4th ventricle

–>CN VI fibers running over the top of CN VI nuclei

Question 25

CN VII and NI exit via what from the calvarium

Answer 25

IAM->auditory canal of petrous bone within which 7 bends ventrally to enter facial canal and exits stylomastoid foramen

Question 26

5 motor branches of CN VII in the parotid gland

Answer 26

``` "to Zanzibar by motor car" temporal zygomatic buccal mandibular cervical ```

Question 27

upper motor neurons to CN VII motor function

Answer 27

bilateral for forehead, unilateral for muscles of the face

Question 28

CN VIIStroke causing--> unilateral UMN lesions to motor cortex associated with seven or corticiobulbar lesions result in

Answer 28

unilateral weakness, or contralateral lower facial muscles-but spares the forehead muscles

Question 29

CN VII-unilateral LMN lesion cuases | BELL'S PALSY

Answer 29

ipsilateral weakness, of lower face, forehad muscles included, ipsilateral hypercusis, dry eye-Bells palsy

Question 30

CN XI NUCLEI

Answer 30

MOTOR- nucleus ambiguus (near pontomedullary junction-innervates stylopharyngeus PANS- inferior salivatory nucleus-lesser petrosal -otic ganglion-parotid gland

Question 31

CN IX exits brain stem @

Answer 31

juntion of pons and medulla

Question 32

CN IX exits calvarium via

Answer 32

jugular foramen

Question 33

nucleus ambiguss share by

Answer 33

CN IX and X

Question 34

raises the pharynx during swalloing

Answer 34

stylopharyngeal muscle

Question 35

testing CN IX lesion

Answer 35

UMN and LMN=dysphagia motor function tough to isolate bc gag reflex shared with ten best done via sensory function

Question 36

motor of CN X found in

Answer 36

Nucleus ambiguus

Question 37

PANS for CN X found in

Answer 37

dorsal motor nucleus of X`

Question 38

nucles ambiguus lies where in the brain stem

Answer 38

lateral medulla

Question 39

Dorsal motor nucleus lies where in the b stem

Answer 39

near midline of medulla

Question 40

DMG of X sends PANS pregang fibers to

Answer 40

intramural ganglia of target organs | heart, lungs, digestive tract up to proximal 2/3 of transverse colon

Question 41

CN X exits where from b stem

Answer 41

bw inferior olive and inferior cerebellar peduncle

Question 42

CN X exits calvarium via

Answer 42

jugular foramen

Question 43

CN X is motor to what muscles

Answer 43

pharyngeal, laryngeal, palate muslces

Question 44

testing CN X

Answer 44

palatal elevation devaites to the side of the lesion

Question 45

gag reflex

Answer 45

sensory= CN IX | Motor to elevate palate= Mostly X but IX as well

Question 46

unilateral LMN lesion of ten causes

Answer 46

hoarseness of the voice, difficulty swallowing, reduced gag reflex on the stimulated side

Question 47

UMN vs LMNS for vagus

Answer 47

UMNS=less prominent signs -substantial bilateral UMN innervation of CN X

Question 48

CN XI controls

Answer 48

head turning thru elevation of the SCM and shoulder elevation of trapezius

Question 49

CN IX recieves motor imputs from 2 nuclei

Answer 49

Nucleus Ambiguus, spinal accessory nucleus

Question 50

fibers from ambiguus travel only a short distance with CN XI before joining

Answer 50

CN X--innervate the pharynx and larynx | *considered vagus

Question 51

spinal accessroy nuclei lie in

Answer 51

intermediolateral gray area between dorsal and ventral horn-C1-5--Ascend to ender calvaria

Question 52

SPinal Accessroy rootles ascend and enter the calvaria @

Answer 52

foramen magnum

Question 53

CN XI exits calvaria @

Answer 53

jugular foramen

Question 54

jugular formaen permits exit of which three nerves

Answer 54

9, 10, 11

Question 55

copntraction of right SCM-

Answer 55

head turns left

Question 56

Unilateral LMN CN XI lesion

Answer 56

weakness and atrophy of SCM and TRAP on the ispsilateral side

Question 57

cant raise right shoulder | cant turn head left

Answer 57

UNilateral LMN lesion or lesion in nucleus of right spinal accessory nerve

Question 58

UMN controlling CN XI

Answer 58

weakness of contralateral shoulder elevation | weakness of ipsilateral SCM muscle-ie weakness in turning head to the right

Question 59

CN XII-motor to tongue-exits brain

Answer 59

ventrall between the inferior olives and the pyramids

Question 60

betwee inferior olives and pyramids and between medulla and brian stem

Answer 60

hypoglossan nerve and entering the hypoglossal canal

Question 61

unilateral LMN of CN XII leasion

Answer 61

protrusion of the tongue towards the lesion side-causing unilateral atrophy and fasciculations

Question 62

UMN lesions of corticobulbar fibers right lesion-left deviation

Answer 62

contralateral lesions right lesions-left atrophy and fasculiations with a deviation