Lecture 25 - Orbit II Flashcards

1
Q

What cranial nerves are in the orbit?

A

CN II, III, IV, V1, and VI

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2
Q

What is CN II?

A

Optic

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3
Q

What is CN III?

A

Oculomotor

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4
Q

What is CN IV?

A

Trochlear

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5
Q

What is CN V1?

A

Opthalmic division of Trigeminal

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6
Q

What is CN VI?

A

Abducens

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7
Q

What travels through the optic canal?

A

Optic nerve, internal opthalmic artery and vein

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8
Q

What does CN III innervate?

A

Ventral oblique
V/M/D recti
Levator palpebrae superioris

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9
Q

What does the CN III innervate that is NOT muscle?

A

Ciliary ganglion

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10
Q

What are the branches of CN III?

A

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

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11
Q

What is the function of the long ciliary nn.?

A

Sensory from cornea and sclera

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12
Q

What is the function of the ethmoidal nn.?

A

Sensory from nasal cavity

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13
Q

What is the function of the short ciliary?

A

Parasympathetics to pupillary sphincter and ciliary muscle

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14
Q

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

A

Edinger-westphal nucleus - midbrain

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15
Q

Where do the nerves from the ciliary ganglion do?

A

Pupillary sphincter and ciliary muscles

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16
Q

What does the trochlear n. innervate?

A

Dorsal oblique m.

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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
What association do PNS nerves have as they enter the head?
Fibers wrap around vasculature
26
What is the internal carotid plexus?
SNS pathway to the eye
27
Where does the internal carotid plexus go?
Dilator pupillae m.
28
What is the main artery that gives rise to external opthalmic a.?
Maxillary
29
What artery gives rise to the internal opthalmic a.?
Internal carotid a.
30
Where is there a connection between the external and internal carotid?
Short ciliary aa. off long ciliary aa.
31
What branches off the short ciliary aa.?
Retinal aa.
32
Where does venous drainage from the orbit go?
Cavernous sinus -- or -- Deep facial vein via V/D external opthalmic v.
33
What muscle adducts the eye?
Medial rectus
34
What muscle abducts the eye?
Lateral rectus
35
What does the dorsal rectus do?
Adduct and elevate eye
36
What does the ventral rectus do?
Adduct and depress eye
37
What does the ventral oblique do?
Abduct and elevate eye
38
What does the dorsal oblique do?
Abduct and depress eye
39
What muscles are involved in looking up?
Dorsal rectus and ventral oblique
40
What muscles are involved in looking down?
Ventral rectus and dorsal oblique