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Anterior Segment > Anterior Seg Anatomy > Flashcards

Anterior Seg Anatomy Flashcards

1
Q

what structure is a barrier for infections from the eyelids into the orbit & restricts fat from falling into the lid margin

A

orbital septum

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2
Q

what is the passageway for nasociliary nerve, CN3, CN6, CN2, & ophthalmic artery

A

common tendinous ring (annulus of Zinn)

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3
Q

what structure acts as a protective cover over EOM insertion into the sclera & separates the globe from orbital fat

A

Tenon’s capsule

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4
Q

what are the structures in the nasolacrimal drainage system

A

lacrimal puncta → canaliculi → lacrimal sac → nasolacrimal duct → valve of Hasner

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5
Q

what is the size of the canaliculi

A

10 mm ( 2mm vertical, 8mm horizontal)

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6
Q

what lies within the fossa formed by maxillary & lacrimal bones & is located anterior to the orbital septum

A

lacrimal sac

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7
Q

what is the size of the nasolacrimal duct

A

15mm long

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8
Q

what prevents backflow of nasal fluids into the nasolacrimal duct

A

valve of Hasner

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9
Q

what are the voluntary muscles of the orbit

A

EOMs & LPS

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10
Q

what are the involuntary muscles of the orbit

A

Muller’s muscle

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11
Q

what muscles are innervated by the superior branch of CN3

A

superior rectus, LPS

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12
Q

what muscles are innervated by the inferior branch of CN3

A

medial rectus, inferior rectus, inferior oblique, Muller’s

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13
Q

what are the three branches of the ophthalmic nerve (V1)

A

frontal, nasociliary, lacrimal

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14
Q

which branch of V1 innervates the cornea

A

nasociliary

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15
Q

what is the size of palpebral fissures

A

28-30mm wide, 9-10mm height

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16
Q

what structure is composed of collagen fibrils that surround the meibomian glands

A

tarsal plates

17
Q

what provides rigidity to the eyelids

A

tarsal plates

18
Q

what is a mucus membrane w/ non-keratinized squamous epithelium?

A

conjunctiva

19
Q

what tissue maintains the shape of the globe

A

sclera

20
Q

what are the layers of the cornea

A

epithelium → Bowman’s → stroma → Descemet’s → endothelium

21
Q

which layers of the cornea cannot regenerate

A

Bowman’s & endothelium

22
Q

what is the corneal stroma composed of

A

collagen fibrils, keratocytes, ECM

23
Q

where are the stem cells of the cornea found

A

limbus

24
Q

what is the thickest layer of the cornea?

A

stroma

25
Q

what muscle originates at the common tendinous ring?

A

inferior rectus

26
Q

what muscle is innervated by the sympathetic nervous system?

A

muller’s muscle

27
Q

what ganglion is located inside the orbit?

A

ciliary

28
Q

what is the average height of the palpebral fissure?

A

10 mm

29
Q

what travels adjacent to maxillary sinus through the nasolacrimal canal & terminates at the inferior meatus

A

nasolacrimal duct

30
Q

which branch of the nasociliary nerve innervates the conjunctiva, medial eyelids, lacrimal sac, caruncle, & side of nose

A) infratrochlear
B) long ciliary
C) short ciliary

A

infratrochlear

31
Q

which branch of nasociliary nerve innervates the iris, corneal epithelium, anterior & middle corneal stroma & Muller’s

A) infratrochlear
B) long ciliary
C) short ciliary

A

long ciliary

32
Q

which nasociliary branch innervates the ciliary body & iris sphincter?

A) infratrochlear
B) long ciliary
C) short ciliary

A

short ciliary

33
Q

what height of the palpebral fissure would be considered eyelid retraction?

A

> 12 mm

34
Q

the conjunctiva is composed of? which one contains goblet cells?

A
  • epithelial layer → contains goblet cells

- stroma

35
Q

which tissue contains superficial & deep vascular networks that are visible through the conjunctiva?

A

episclera

36
Q

what layer is the attachment site for all EOMs?

A

sclera

37
Q

what is the average central thickness of the cornea?

average peripheral thickness?

A
  • central → 540-560 microns

- peripheral → 710 microns

38
Q

what separates the anterior & posterior chambers?

A

iris

39
Q

where are blood vessels located in in the iris?

A

iris stroma

Anterior Segment (37 decks)

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