Orbit, Eyelids and Lacrimal system Flashcards Preview

Neuro exam 3 > Orbit, Eyelids and Lacrimal system > Flashcards

Flashcards in Orbit, Eyelids and Lacrimal system Deck (25)
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1
Q
Superior Orbital Fissure separates:
A
greater and lesser wings of sphenoid bone
2
Q
SOF transmits
A
1. CN 3, 4, 6, cranial division of 5
2. sympathetic nerve fibers
3. superior ophthalmic vein
3
Q
Nasolacrimal Canal houses
A
nasolacrimal duct, which allows tears to drain nasally
4
Q
Nasolacrimal Canal runs from
A
lacrimal sac to inferior meatus of nose
5
Q
7 layers of eyelid
A
1. skin and subQ tissue
2. muscles of protraction
3. orbital septum
4. orbital fat
5. muscles of retraction
6. tarsus
7. conjunctiva
6
Q
Muscles of protraction
A
1. Orbicularis oculi
2. innerv by Cranial Nerve VII
7
Q
Orbital septum
A
1. Thin multilayered fibrous tissue
2. Protective against infection and trauma
8
Q
upper eyelid, muscles of retraction
A
1. levator muscle
2. superior tarsal muscle
9
Q
lower eyelid: muscles of retraction
A
1. inferior tarsal muscle
2. capsulopalpebral fascia
10
Q
tarsus
A
dense plate of c.t
11
Q
conjunctiva
A
extends from orbit to cover interior of eyelid
12
Q
Lacrimal canaliculi:
A
1. Aka ducts
2. Small channels in each eyelid which conduct tears
13
Q
Lacrimal Puncta:
A
Minute orifices where the lacrimal canaliculi commence
14
Q
Meibomian Glands
A
1. Specialized sebaceous gland in the eyelid
2. Oily substance prevents rapid tear evaporation
15
Q
lacrimal gland is located
A
in superior, lateral portion of each orbit
16
Q
lacrimal gland secretes
A
aqueous portion of tears
17
Q
glands of zeiss
A
1. specialized sebaceous glands that service the eyelashes
2. located on margin of eyelid
18
Q
Whitnall’s Ligament
A
1. Support ligament for upper eyelid and superior orbit
2. Improves efficiency of levator
19
Q
Muller Muscle
A
1. Helps raise upper eyelid
2. Smooth muscle adjoining levator
20
Q
Lockwood’s Ligament
A
1. Supports eye inferiorly and prevents downward displacement
2. Forms hammock below eyeball
21
Q
Annulus of Zinn:
A
Ring of fibrous tissue around optic nerve, origin for 5 of the EOM
22
Q
Primary Blood supply eye
A
ophthalmic artery (branch of internal carotid)

23
Q
Secondary blood supply eye
A
Secondary supply from facial and maxillary arteries (branch of external carotid)
24
Q
eye: venous drainage
A
Drained by ophthalmic vein

Anastomoses anteriorly with facial veins and posteriorly with pterygoid plexus
25
Q
List extra-ocular muscles
A
1. Superior rectus
2. inferior rectus
3. lateral rectus (CN 6)
4. Medial rectus
5. Inferior oblique
6. Superior Oblique (CN 4)

rest CN 3