Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Anatomy Module 3 > Cranial Nerve VII Facial nerve and Cranial nerve III > Flashcards

Cranial Nerve VII Facial nerve and Cranial nerve III Flashcards

1
Q

Where does Cranial nerve VII emerge?

A

from brainstem at ventrolateral aspect of caudal pons near pontomedullary junction.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

nervus intermedius

A

smaller root of CN VII between root of CN VII and CN VIII contains GSA SA GVE GVA

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Large motor root of CN VII

A

SVE function

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Which fossa does CN VII emerge from?

A

posterior cranial fossa via the internal acoustic meatus same as CN VIII

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Where does CN VII go after leaving through internal acoustic meatus?

A

it courses through temporal bone, then exits via stylomastoid foramen

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Functions of facial nerve: SVE

A

Muscles of facial expression (and a few others)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Functions of Facial nerve: GVE

A

General visceral efferents, parasympathetic inneration of lacrimal nasal palatine upper pharynx submandibular and sublingual glands

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Functions of facial nerve: GSA

A

General somatic afferents take in sensory info from portion of external ear

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Functions of facial nerve SA

A

Somatic afferents bring in taste info from anterior 2/3 of tongue and palate

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Fuctions of facial nerve: GVA

A

Recurrent fiber path that follows GVE fibers

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Where is the facial motor nucleus?

A

Pons

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Describe flow of info from corticobulbar fibers from motor cortex to innervation of facial muscles

A

Motor cortex -> facial motor nucleus (pons contralateral some ipsilateral) -> stylomastoid foramen -> facial muscles

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What would be associated with damage to RIGHT corticobulbar damage to upper motor neurons of CN VII?

A

Selective weakness of LEFT lower facial muscles.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What would be associated with damage to right facial nerve?

A

Weakness in RIGHT upper and lower facial muscles

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Function of Orbicularis oculi?

A

closes the eye

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Describe blink reflex

A

CN-V fibers (GSA) carry pain info from cornea to CNS (spinal trigeminal nucleus) CN VII fibers (SVE) close the eye, blink is bilateral, spinal trigeminal fibers relay through recticular formation to bilateral facial motor nuclei

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

Which Cranial nerves innervate skeletal muscle that control eye movements?

A

Oculomotor, Trochlear, Abducens

18
Q

Where do cranial nerves III, IV, and VI emerge from?

A

Superior orbital fissure (just like cranial nerve V) which is in the sphenoid bone by the way

19
Q

Which extraocular eye muscles does CN III innervate? (4)

A

Superior rectus, inferior rectus, medial rectus, inferior oblique

20
Q

Which extraocular eye muscle does CN IV innervate

A

superior oblique

21
Q

Which extraocular eye muscle does CN VI innervate?

A

Lateral rectus

22
Q

What is adduction?

A

movement towards midline

23
Q

What is abduction?

A

movement away from midline

24
Q

What is internal/medial rotation/ intorsion

A

12 o clock position moves towards nose

25
Q

What is external/lateral rotation/ extortion

A

12 oclock position moves away from the nose

26
Q

Visual axis v orbital axis

A

visual axis is set off from orbital axis by about 23 degrees

27
Q

Superior oblique (isolated)

A

Abducts, depresses and medially rotates eyeball. Attaches to posterior and superior to horizontal axis. Passes medial to vertical axis and attaches to superior aspect of globe, so it abducts

28
Q

Inferior oblique (isolated)

A

Abducts elevates and laterally rotates eyeball. attaches posterior and inferior to horizontal axis, depresses posterior aspect of globe so it elevates the eye. Passes medial to vertical axis and attaches to posterior inferior aspect of globe, so it abducts the eye.

29
Q

Superior rectus (isolated)

A

Elevates adducts and rotates eyeball medially. Passes medial to vertical axis and attaches to anterior aspect of globe, so it adducts the eye.

30
Q

Inferior rectus (isolated)

A

depresses, adducts and rotates eyeball medially. passes medial to vertical axis and attaches to anterior aspect of globe so it adducts eye.

31
Q

Medial rectus (isolated)

A

adducts eyeball

32
Q

lateral rectus

A

Abducts eyeball

33
Q

Intorsion of globe

A

muscles with medial pull above visual axis intort/medially rotate globe, so superior oblique and superior rectus

34
Q

Extorsion of globe

A

muscles with medial pull below visual axis extort/laterally rotate globe, so inferior oblique and inferior rectus

35
Q

when eye is fully adducted which muscles move it up and down?

A

Superior and inferior oblique, they are in parallel at this point and can be pure elevators and depressors.

36
Q

When eye is fully abducted which muscles move it up and down?

A

superior and inferior rectus

37
Q

Where is CN III nucleus?

A

in rostral midbrain at level of superior colliculus

38
Q

Besides the 4 extraocular eye muscles what other efferent effects does CN III have?

A

GSE for levator palpebrae superioris muscle which elevates superior eyelid. and parasympathetic fibers GVE that pass to constrictor muscle of pupil

39
Q

Are connections from oculomotor nucleus to inferior rectus, medial rectus, and inferior oblique contralateral or ipsilateral?

A

they are ipsilateral and leave as the oculomotor nerve through the superior orbital fissure

40
Q

What do neurons on contralateral oculomotor project to?

A

to contralateral superior rectus muscles

41
Q

From which oculomotor nuclei is the levator palpebrai superioris muscle innervated?

A

from bilateral oculomotor nuclei

42
Q

Where do GVE fibers that eventually innervate ciliary muscles and sphincter pupillae come from and what is their path

A

They come from Edinger westphal nucleus, these are preganglionic sympathetic fibers that synapse on ciliary ganglion which then become postganglionic fibers and the innervate the ciliary muscles and pupil sphincter

Anatomy Module 3 (8 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions