Lecture 25 - Orbit II Flashcards Preview

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Flashcards in Lecture 25 - Orbit II Deck (40)
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1
Q

What cranial nerves are in the orbit?

A

CN II, III, IV, V1, and VI

2
Q

What is CN II?

A

Optic

3
Q

What is CN III?

A

Oculomotor

4
Q

What is CN IV?

A

Trochlear

5
Q

What is CN V1?

A

Opthalmic division of Trigeminal

6
Q

What is CN VI?

A

Abducens

7
Q

What travels through the optic canal?

A

Optic nerve, internal opthalmic artery and vein

8
Q

What does CN III innervate?

A

Ventral oblique
V/M/D recti
Levator palpebrae superioris

9
Q

What does the CN III innervate that is NOT muscle?

A

Ciliary ganglion

10
Q

What are the branches of CN III?

A

Long cililary nn., A/P ethmoidal nn., and short ciliary nn.

11
Q

What is the function of the long ciliary nn.?

A

Sensory from cornea and sclera

12
Q

What is the function of the ethmoidal nn.?

A

Sensory from nasal cavity

13
Q

What is the function of the short ciliary?

A

Parasympathetics to pupillary sphincter and ciliary muscle

14
Q

Where do the nerves (not CN III) in the ciliary ganglion come from?

A

Edinger-westphal nucleus - midbrain

15
Q

Where do the nerves from the ciliary ganglion do?

A

Pupillary sphincter and ciliary muscles

16
Q

What does the trochlear n. innervate?

A

Dorsal oblique m.

17
Q

What does the abducens n. innervate?

A

Lateral rectus m.

18
Q

What are the branches of CN V1 within the orbit?

A

Nasociliary - Frontal - Lacrimal

19
Q

What does the nasocillary n. do?

A

Sensory from nasal cavity, cornea and sclera

20
Q

What does the frontal n. do?

A

Sensory from skin of forehead and scalp

21
Q

What does the lacrimal gland do?

A

Sensory from lacrimal gland, conjunctiva, and upper eye lid

22
Q

What are the branches off the nasociliary branch of CN V1?

A

Long ciliary nn and Ethmodial nn.

23
Q

What nerve innervates the lacrimal gland?

A

postganglionic PNS travel from pterygopalatine ganglion

24
Q

What does the nerve innervating the lacrimal gland travel through?

A

Orbital fissure

25
Q

What association do PNS nerves have as they enter the head?

A

Fibers wrap around vasculature

26
Q

What is the internal carotid plexus?

A

SNS pathway to the eye

27
Q

Where does the internal carotid plexus go?

A

Dilator pupillae m.

28
Q

What is the main artery that gives rise to external opthalmic a.?

A

Maxillary

29
Q

What artery gives rise to the internal opthalmic a.?

A

Internal carotid a.

30
Q

Where is there a connection between the external and internal carotid?

A

Short ciliary aa. off long ciliary aa.

31
Q

What branches off the short ciliary aa.?

A

Retinal aa.

32
Q

Where does venous drainage from the orbit go?

A

Cavernous sinus
– or –
Deep facial vein via V/D external opthalmic v.

33
Q

What muscle adducts the eye?

A

Medial rectus

34
Q

What muscle abducts the eye?

A

Lateral rectus

35
Q

What does the dorsal rectus do?

A

Adduct and elevate eye

36
Q

What does the ventral rectus do?

A

Adduct and depress eye

37
Q

What does the ventral oblique do?

A

Abduct and elevate eye

38
Q

What does the dorsal oblique do?

A

Abduct and depress eye

39
Q

What muscles are involved in looking up?

A

Dorsal rectus and ventral oblique

40
Q

What muscles are involved in looking down?

A

Ventral rectus and dorsal oblique