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Anatomy > Lecture 24 - Orbit I > Flashcards

Lecture 24 - Orbit I Flashcards

1
Q

What is the ligament that forms the lateral portion of the oribit?

A

Postorbital ligament

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2
Q

What are the four regions of the orbit?

A

Roof, lateral wall, medial wall, and floor

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3
Q

What are the components of the orbit??

A

Zygomatic, lacrimial, frontal, maxilla, and palatine

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4
Q

What is the floor of the orbit made of?

A

Zygomatic, maxilla, and palatine

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5
Q

What are the supportive connective tissues of the eyelids?

A

Orbital septum and Tarsus

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6
Q

What is the orbital septum?

A

Connective tissue sheet

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7
Q

What is the tarsus?

A

A Fibrous structure

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8
Q

What are embedded into the tarsal plates?

A

Tarsal glands

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9
Q

What are tarsal glands?

A

Modified sebaceous glands that secrete only oily substance that increase the viscosity of tears and decrease tear evaporation

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10
Q

What is a chalazion?

A

Inflammation/blockage of the tarsal/meibomian gland

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11
Q

What is conjunctiva?

A

Non-keratinized, stratified squamous epithelium with goblet cells

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12
Q

What is within the conjunctival sac?

A

Bulbar and palpebral conjunctiva

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13
Q

What is the palpebral conjunctiva made of?

A

Superior and inferior fornices

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14
Q

What is conjuncitivitis?

A

Common, Primarily infectious conjunctivitis caused by different bacteria, viruses, mycoplasma, fungi, and parasites

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15
Q

What is the canthi?

A

Meeting sits of the upper and lower eyelids

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16
Q

What are the palpebral commissures?

A

CT of the corner of the eyes

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17
Q

What are the muscles involved in moving the eyelids?

A

Orbicularis oculi and levator palebrae superioris m.

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18
Q

What nerve innervates the orbicularis oculi?

A

CN VII

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19
Q

What nerve innervates the levator palebrae superioris m.?

A

CN III

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20
Q

What is the path of lacrimal gland?

A

Lacrimal gland - lacrimal punctum - lacrimal canaliculi - nasolacrimal duct

21
Q

What is the major component of the tear film from goblet cells?

A

Glycoprotein

22
Q

What part of the tears do the tarsal glands make?

A

oily component

23
Q

What is the tenon’s capsule?

A

Membrane pierced by ciliary structures and muscle tendons, makes the episcleral space

24
Q

What is within the episcleral space?

A

Lymph

25
Q

What are the three “layers” of the eye?

A

Sclera - choroid - ora serrata

26
Q

What is the choroid?

A

Layer containing blood vessel

27
Q

What is within the anterior layer of the iris?

A

Containing constrictor pupillae

28
Q

What nervous system that acts on the anterior layer of the iris?

A

PNS

29
Q

What is within the ciliary body?

A

Containing the ciliary muscles

30
Q

What nervous system that acts on the ciliary muscle?

A

PNS

31
Q

What is the ora serrata?

A

Junction between the retina and ciliary body

32
Q

What is contained within the posterior layer of the iris?

A

Dilator pupillae m.

33
Q

What nervous system acts on the dilator pupillae m.?

A

Sympathetic

34
Q

What is the nerve layers of the eye, starting most rostral?

A

nerve fiber - ganglion cell - inner plexiform - inner nuclear - outer plexiform - outer nuclear

35
Q

What is the canal of schlemm?

A

Drains aqueous humor from anterior chamber to venous system

36
Q

What is contained within the retrolental?

A

Vitreous body

37
Q

What is contained within the prelental?

A

Anterior and posterior chambers, aqueous humor

38
Q

What is the function of the suspensory ligaments of Zinn?

A

Tension on or relaxtion of change shape of the lens

39
Q

What fibers are above the iris?

A

Zonular fibers

40
Q

What is the state of the ciliary muscle without nervous stimulation?

A

Relaxed

41
Q

What is the state of the zonular fibers without nervous stimulation?

A

Under tension

42
Q

What is the state of the lens without nervous stimulation?

A

Stretched thin to refract light

43
Q

What circumstance needs the lens to be stretched thin?

A

Distant vision

44
Q

What is the state of the ciliary muscle with nervous stimulation?

A

Ciliary muscle contracts

45
Q

What is the state of the zonular fibers with nervous stimulation?

A

Relax

46
Q

What is the state of the lens with nervous stimulation?

A

Internal tension causes the lens to become more spherical to refract light

47
Q

Why would you can your lens to be spherical?

A

Near vision

48
Q

What nerve is active in the eye with bright light?

A

Ciliary ganglion

49
Q

What CN works to constrict the pupil?

A

CN III

Anatomy (44 decks)

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