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Block 5 > Lab 21 Orbit > Flashcards

Lab 21 Orbit Flashcards

1
Q

Which side of the eyeball is the optic nerve found on?

A

Lateral side

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2
Q

What is a sheet of CT between the tarsal plate and the bony orbital margin?

A

The orbital septum

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3
Q

Prior to and at the optic nerve, the nasociliary nerve gives off what?

A

Long ciliary nerves

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4
Q

What nerve passes directly anterior toward the superior orbital margin and bifurcates at its midpoint?

A. Lacrimal
B. Frontal
C. Trochlear

A

B. Frontal

Bifurcates into the supratrochlear nerve (more medial) and the supraorbital nerve (more lateral)

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5
Q

What connects the ganglion to the posterior surface of the eyeball?

A

Short ciliary nerves

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6
Q

The tarsal plates are found deep to what?

A

The palpebral portion of the orbicularis oculi muscle

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7
Q

What 3 superficial nerves pass from near the apex of the orbit superior to the extraocular muscles?

A

Frontal nerve
Lacrimal nerve
Trochlear nerve

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8
Q

Radial muscle fibers that work slowly to open the pupil

A

Dilator papillae

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9
Q

What do all the rectus muscles have in COMMON?

A

Common attachment to the common tendinous ring

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10
Q

Part of the vascular middle layer (color of eye)

A

iris

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11
Q

Clear, fibrous outer layer (anterior 1/6 of ball, 20%)

A

Cornea

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12
Q

White, fibrous outer layer (posterior 5/6 of ball, 80%)

A

Sclera

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13
Q

Space between the iris and anterolateral part of lens

A

Posterior chamber

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14
Q

What passes through the common tendinous ring? (There are 6 things)

A 
Optic nerve (II)
Abducens nerve (VI) 
Nasociliary nerve
Superior and inferior divisions of the oculomotor nerve 
Central artery of the retina
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15
Q

What is a connective tissue sheath that will block the view/access to all contends of the orbit? What can be seen through this?

A

Periorbita

The frontal nerve can be seen through it

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16
Q

Circular muscles of iris that work to quickly close the pupil

A

Sphincter papillae

17
Q

Where the optic nerve and retinal vessels enter/leave

A

Optic disc

18
Q

Opening in the middle of the iris

A

Pupil

19
Q

What nerve is medial to frontal nerve and follows the superior surface of the superior oblique? What does it innervate? ;)

A

Trochlear nerve, innervates the superior oblique

20
Q

What is the bulbar conjunctiva attached to?

A

The sclera

21
Q

What nerve crosses at an angle from posterolateral to anteromedial and is superficial to the optic nerve?

What is it a branch of?

A

Nasociliary nerve is a branch of V1

22
Q

Space between the cornea and the iris/pupil

A

Anterior chamber

23
Q

Following the inferior oblique muscle posteriorly will lead to the _____ division of the _______ nerve.

A. Inferior, oculomotor
B. Superior, oculomotor
C. Inferior, optic
D. Superior, optic

A

A. Inferior division of the oculomotor nerve

24
Q

Which muscle bends at an acute angle to attach to the posterolateral portion of the eyeball?

Action(s) in neutral gaze?

Action(s) when abducted?

Action(s) when adducted?

A

Superior oblique, goes through the trochlea

Neutral gaze- intortion, abduction, depression

Abducted- intort

Adducted- depression

25
Q

What is located superolaterally?

A. Trochlea
B. Inferior oblique muscle
C. Lacrimal gland

A

C. Lacrimal gland

The trochlea is superomedially

The inferior oblique muscle is attached inferomedially found more anterior at its origin but pass more posterior to its insertion on the eyeball

26
Q

What is found deep to the lacrimal nerve?

Hint: it has 2 heads

What passes through the 2 heads? Medial or lateral surface?

A

The lateral rectus

The abducens passes through the 2 heads on the medial surface near the apex of the orbit

27
Q

Put these in order of superficial to deep:

Superior rectus
Frontal nerve
Levator palpebrae superioris
CN III

A

Superficial- frontal nerve, levator palpebrae superioris, superior rectus, CN III- deep

28
Q

What is the ophthalmic artery a branch of? It crosses _______ to the optic nerve from a ______ position.

A. Inferior, medial
B. Superior, medial
C. Superior, lateral
D. Inferior, lateral

A

The internal carotid artery

C

29
Q 
What is a slit like opening between the eyelids?
A. Palpebral fissure
B. Lacrimal caruncle 
C. Lacrimal papilla
D. Lacrimal puncta
A

A. Palpebral fissure

The lacrimal caruncle is a fleshy bump in the medial angle

The lacrimal papilla is a small bump on the medial end of the eyelid

The lacrimal punta is a small opening at the apex of the papilla (used for dilation)

30
Q

What nerve follows the lateral wall of the orbit to the lacrimal gland?

A

Lacrimal nerve :)

31
Q

Inner layer, likely detached in cadaver eye

A

Retina

32
Q

Where the vitreous body once was

A

Virtuous chamber

33
Q

What is found between the optic nerve and the lateral rectus muscle? Where is this usually found?

A

The ciliary ganglion

Closer to the apex than to the eyeball

34
Q

What is a membrane that lines the surface of the eyeball (sclera)?
A. Conjunctival sac
B. Palpebral conjunctiva
C. Bulbar conjunctiva

A

C. Bulbar conjunctiva

The palpebral conjunctiva is the membrane that lines the inner surface of the eyelid

The conjunctival sac is a potential space between bulbar and palpebral conjunctivae

Block 5 (12 decks)

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