Pons

Question 1

Abducens & Facial Nerve

Answer 1

1) Egress from same level, but nucleus not at same level
2) Abducens thru medial lemniscus
3) Facial b/w motor and sensory

Question 2

Trapezoid body/nucleus

Answer 2

1) auditory function

Question 3

PPRF

Answer 3

1) eye movement

Question 4

MLF

Answer 4

1) part of eye movement

Question 5

Abducens Nucleus

Answer 5

1) innervates the lateral Rory ectus muscle in eye

Question 6

Facial Nucleus

Answer 6

1) Innervates all muscles of facial expression on ipsilateral side

Question 7

Middle Cerebellar Peduncle

Answer 7

Carries fibers to ipsilateral cerebellum

Question 8

Superior Salivatory nucleus

Answer 8

1) Parasympathetic preganglionic CN7

Question 9

Solitaris nucleus/tract

Answer 9

Receive visceral afferents from CN7

Question 10

Chief sensory nucleus of trigeminal

Answer 10

1) Top of column
- pars oralis=middle
- pars caudalis=bottom

Question 11

Superior olivary nucleus

Answer 11

1) Auditory fxn

Question 12

Tumor of 4th ventricle

Answer 12

1)Ablation of Abducens nucleus
Compromise ipsilateral facial nerve
-abducens nerve innervates lateral rectus muscle of eye
-causes eyes to gaze inward=MEDIAL STRABISMUS
AKA internal strabismus

Question 13

Bells Palsy

Answer 13

1) Half of face is paralyzed

2) W/internal strabismus– due to ablation of abducens nucleus

Question 14

Motor nucleus of trigeminal

Answer 14

1) Sensory cranial nerve
- supplies sensory to face
- SVE fibers
2) 3 dermatome branches
- Opthalamic- sensory across forehead
- Maxillary-sensory of nose and cheek
- Mandibular-Lower jaw (motor and sensory)

Question 15

Mesencephalic nucleus of trigeminal

Answer 15

1) Reflex proprioception for muscles of mastication
2) Unique bc:
- primary sensory neurons inside the CNS
- nothing synapses onto

Question 16

Pontocerebellar Fibers/nucleus

Answer 16

1) Project to contralateral cerebellum
- enters cerebellum via middle cerebellar peduncle
2) Receives input from corticospinal
- tells neurons what they are about to do to skeletal muscle
- cerebellum modifies
3) Visualizion of motion will still cause fibers to activate

Question 17

Middle Cerebellar Peduncle

Answer 17

1) Major input into cerebellum

2) Corticospinal tract descend and send signals to LMN (brainstem or spinal cord) that talks to muscles

Question 18

Lateral Lemniscus

Answer 18

1) Auditory fxn

Question 19

Central Tegmentum Tract

Answer 19

1) Connection between motor cortices and reticular formation

Question 20

Ventral Spinothalamic tracts

Answer 20

1) enter via superior cerebellar peduncle on same side

- crosses to other cerebellum once in peduncle

Question 21

Lateral & Medial Parabrachial nucleus

Answer 21

1) Pneumotactic centers for respiration

- rate and depth of inspiration