Corticobulbar Tract

Question 1

Motor and sensory innervation of head and neck including special senses.
Purely motor, purely sensory, mixed
CN nuclei located within the brainstem

Answer 1

Cranial Nerve

Question 2

Corticonuclear fibers originate in…

Answer 2

precentral gyrus

Question 3

Corticonuclear fibers pass with corticospinal tract fibers through:

Answer 3

corona radiata, internal capsule (area 4 at genu( and cerebral peduncle

Question 4

Cortionuclear fibers project:

Answer 4

BILATERAL!!!

Question 5

Corticonuclear fibers end in:

Answer 5

brainstem motor nuclei of CNS V, VII (contralateral)
CN XII (contralatera) and nucleus ambiguus (CNs IX and X) and acessory nucleus

Question 6

Cotriconuclear fibers end in the contralateral:

Answer 6

brainstem motor nuclei of CNS V and VII

and CN XII

Question 7

Corticonuclear fibers end in the ispilateral:

Answer 7

nucleas ambiguis (CN IX and X) and the accessory nucleus

Question 8

CN V (motor nucleus of V) is for :
and is contralateral or bilateral termination of brainstem motor nuclei

Answer 8

muscles of mastication

bilateral

Question 9

CN VII (facial nucleus) is for:
and is contralateral or bilateral termiantion of brainstem motor nuclei

Answer 9

muslces of facial expression

Contralateral

Question 10

CN X (nucleus ambiguus) is for:
and is contralateral or bilateral termiantion of brainstem motor nuclei

Answer 10

muslces of soft palate, pharynx and larynx

bilateral

Question 11

CN XI (Accessory nucleus) is for:
and is contralateral or bilateral termiantion of brainstem motor nuclei

Answer 11

sternocleomastoid and trapezius

bilateral

Question 12

CN XII (hypoglossal nucleus) is for:
and has bilateral or contralateral termination of brainstem

Answer 12

intrinsic and extrinsic muscles of tongue

contralateral

Question 13

Corticobulbar tract has one UMN that projects to LMN in the:

Answer 13

cranial nerver motor nuclei of brainstem

Question 14

Fuctionof the corticobulbar tract

Answer 14

controls muscles of head, face and neck

Question 15

corticobulbar tract route:

Answer 15

cerebral cortex–> corona radiata –> internal capsule –> and through posterior limb of internal capsule and end on the CN motor nuclei

Question 16

Where do corticobulbar tract end?

Answer 16

CN motor nuclei

Question 17

As the corticobulbar fibers project through posterior limb of internal capsule, they are further or closer than the CST?

Answer 17

CLOSER to genu

Question 18

Precentral gyrus projects with corticospinal tract to CN motor nuclei in brainstem and are the ____ for the brainstem CN nuclei

Answer 18

UMN

Question 19

Nuclei that recieve direct corticobulbar fibers include:

Answer 19

trigeminal, facial, hyoglossal nuclei

Question 20

bilateral lesion of corticobulbar tract is:

Answer 20

Pseudobulbar palsy

Question 21

What are the symptoms of a Pseudobulbar pasly?

Answer 21

dysphagia, dyarthria, paresis of tongue, loss of emotion control
(bilateral lesion of corticobulbar tract)

Question 22

Causes of Pseudobulbar palsy

Answer 22

brainstem infarct, ALS, MS

Question 23

Lesion int the internal capsule with affect both:

Answer 23

corticobulbar and corticospinal tract
will have contralateral hemiplegia with
CNVII or CN XII deficiets

Question 24

Patient has drooling on the right side of face but normal forehead wrinkle… the lesion is:

Answer 24

left corticobulbar tract before facial nucleus

possible stroke in patients right cortex

Question 25

Patient has drooling on right side of face and eye droop and no wrinkling of forehead... the lesion is:

Answer 25

Right peripheral nerve: belz palsy

Question 26

paralysis of contralateral lower quadrant of face

Answer 26

coticobulbar tract lesion -see food pockets on the other side (opp from lesion), droop and have trouble talking/smiling but the whole forehead is fine because of dual innervation to trigeminal nerve

Question 27

Where is the UMN from the left hypoglossal nucleus controlling the tongue come from?

Answer 27

right cortex in the corticobulbar/corticonuclear tract, its a contralateral innervation!

Question 28

Where is the the lesion from the right hypoglossal nucleus controlling the tongue come from?

Answer 28

From the left corticonuclear tract or from right CN XII after it leaves the right hypoglossal nerve

Question 29

Corticonuclear tract lesion will cause the tongue to

Answer 29

deviate away from lesioned side

Question 30

Peripheral lesion of CN XII causes tongue to:

Answer 30

deviate towards lesioned side

Question 31

bilatearal lesion of UMN that make up corticonuclear tract

Answer 31

Pseudobulbar palsy

Question 32

weakness of musles involved in chewing, swallowing, speaking and LOSS of emotional control

Answer 32

Pseudobublar palsy

Question 33

Possible causes of Pseudobulbar palsy

Answer 33

brainstem infarcts, ALS, MS

Question 34

These two tracks get cortical control of motor activity

Answer 34

corticospinal tract/pyramidal system and corticobulbar tract