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Flashcards in Pons Deck (35)
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1

What is a major landmark of the pons?

Pontine protuberance

2

The base of the pons is the ______ while the dorsal part of the pons is mostly ______

base - pontine protuberance
dorsal - tegmentum

3

What two structures are in the Facial colliculus?

1. Nucleus of CN 6
2. Motor root of 7

4

What is the bridge between the pons and the cerebellum?

Middle cerebellar peduncle

5

What two cranial nerves are found in the low pons?

CN 6
CN 7

6

What separates the pontine protuberance from the tegmentum?

Medial lemniscus

7

corticobulbar tracts innervate the ____ while the corticospinal tracts innervate the ____

corticobulbar - face
corticospinal - body

8

What structure in the pons is important for fast horizontal conjugate eye movements?

PPRF (paramedian pontine reticular formation)

9

What CN and nucleus are responsible for tearing?

CN 7
Superior salivatory nucleus

10

What are the two roots of the facial nerve?

Motor root
Nervus intermedius

11

the motor nucleus of CN VII innervates the ____ and _____

1. face
2. stapedius (middle ear)

12

The facial nerve enters the _____ _____ _____ and exits through the ______ ______

internal auditory meatus
stylomastoid foramen

13

CN VII ____ the eye while CN III ____ the eyes

CN VII - closes
CN III - opens

14

The superior salivatory nucleus innervates the _____ gland while the inferior salivatory nucleus innervates the ____ gland

superior - lacrimal
inferior - parotid

15

The greater petrosal nerve carries _____ fibers while the deep petrosal nerve carries ____ fibers

greater petrosal - parasympathetic
deep petrosal - sympathetic

16

Does CN VII synapse with the Geniculate ganglion?

Fuck that shit, it just runs through it

17

What brainstem nucleus does the greater superficial petrosal nerve originate?

Superior salivatory nucleus

18

chorda tympani runs below the __________

Greater superficial petrosal nerve

19

What cranial nucleus is responsible for general sensation behind the ear?

Spinal trigeminal nucleus through CN 7

20

Corticobulbar lesions cause _____ facial weakness while CN VII lesions cause _____ facial weakness

corticobulbar - central (UMN)
CN VII - peripheral (LMN)

21

Corticobulbar tracts synapse with all _____ cranial nuclei

motor

22

Why don't parasympathetics get coricobulbar drive?

because they don't innervate striated skeletal muscle

23

upper face LMNs get _______ corticobulbar innervation while low face LMNs get _______ corticobulbar innervation

upper face - bilateral innervation
lower face - contralateral innervation

24

Does the GSPN carry pre or post ganglionic nerve fibers?

pre

25

The Pons is important for _____ conjugate eye movements while the Midbrain is important for _____ conjugate eye movements

pons - horizontal eye movements
midbrain - vertical eye movements

26

What are the associated symptoms of a lesion of the sixth nerve in the pons?

1. Horizontal gaze palsy
2. contra spastic hemiparesis
3. CN 7 palsy ("long tract" signs)

27

What are the associated symptoms of a lesion of the sixth nerve in the subarachnoid space?

1. LMN signs of CN 7
2. no facial numbness or body weakness
*cuz CN 6 and 7 reside in subarachnoid space*

28

What could cause a 6th nerve lesion in Dorello's canal?

Mastoiditis or metastatic bone cancer

29

What cranial nerves are in the cavernous sinus?

3, 4, V1, V2, 6
*not V3*

30

What are three characteristics that indicate a CN 6 lesion in the orbit?

1. CN 6 palsy
2. proptosis
3. RAPD