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Anatomy Test 5 > Eye > Flashcards

Eye Flashcards

1
Q

Orbits borders

A

superior- frontal sinus
Laterally - Temporel fossa
inferiorlly- maxillary sinus
medially- ethmoid air cells and sphenoid air sinus

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2
Q

orbit base

A

orbital margin surrounding the orbital opening

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3
Q

orbit walls and apex

A

Superior wall- orbital plate of the frontal bone
lateral wall - zygomatic bone
floor- maxilla
medial wall - orbital plate of the ethmoid

apex- optic canal

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4
Q

contents of orbit

A

eyeball
extraocular muscles
sensory, motor nerves and vascular supply
orbital fascia
mucous membrane
extraocular fat

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5
Q

concentric layers of tissue

A

encloses the lens, vitreous body, and aqueous humor

  1. external fibrous tunic
  2. Middle vascular tunic - uvea
  3. internal nervous tunic - retina
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6
Q

external fibrous tunic

A

composed of the cornea and sclera

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7
Q

cornea

A

Anterior transparent portion of the fibrous tunic
Responsible for most of the light refraction that occurs in the eye

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8
Q

sclera

A

posterior opaque part of the fibrous tunic

Receives tendon of the muscles of the eye

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9
Q

middle vascular tunic

A

(uvea)

choroid
ciliary body
iris

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10
Q

choroid

A

brown coat that lines the posterior two thirds of the sclera

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11
Q

ciliary body

A

thickening of the vascular tunic at the level of the corneoscleral junction

gives rise to ciliary processes which produce aqueous humor, and give attachment to the suspensory ligament of the lens

Contains the ciliary muscle is responsible for accommodation

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12
Q

iris

A

divides the space between the cornea and lens into anterior and posterior aqueous Chambers

Pigment cells responsible for color

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13
Q

internal nervous tunic (retina)

A

Innermost layer, which contains special receptors cells upon which is projected an inverted image of objects seen

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14
Q

Aqueous humor

A

clear fluid produced by ciliary processes, posterior to the iris

passes through the people to the anterior chamber
Produces nourishment for the cornea and lens

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15
Q

Lens

A

Transparent, structure enclosed in a capsule and suspended between the aqueous humor and vitreous body by the ciliary zonules

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16
Q

Vitreous humor

A

clear liquid that fills the space posterior to the lens

17
Q

Rectus muscles

A

superior CN3
Inferior CN3
Medial CN3
Lateral CN6

all for muscles, originate from in common tenements ring that surrounds the optic canal and superior orbital fissure

They extend anteriorly to insert into the anterior portion of the sclera

18
Q

Extraocular muscles

A

superior oblique
Inferior oblique

19
Q

superior oblique

A

Originates from body of the sphenoid bone passes through the trochlea (cartilaginous, sling) and inserts on the posterior lateral aspect of the sclera (deep to the superior rectus muscle)

Innervation CN IV

20
Q

inferior oblique

A

Originates from the anteromedial aspect of the floor of the orbit, and inserts into the Posterolateral aspect of the sclera (deep to the lateral rectus muscle)

Innervation CN3

21
Q

Ophthalmic nerve

A

CNV V1

Three Divisions
lacrimal nerve
frontal nerve
Nasociliary nerve

22
Q

Ciliary ganglion

A

found in the posterior extent of the orbital cavity

Contains nerve cell bodies of the postganglionic parasympathetic neurons that control that eye

Supported by the trigeminal nerve

Preganglionic fibers arise from CN3

23
Q

Vascular supply

A

ophthalmic artery

Branches
Lacrimal artery
Supraorbital
Supratrochlear
Central artery of the retina
ciliary arteries

24
Q

lacrimal apparatus

A

Location- anterior superlateral corner of orbit

25
Q

lacrimal papillae

A

Small hillocks at the medial end of each eyelid

26
Q

lacrimal puncta

A

openings of the lacrimal canaliculi at the apex of the lacrimal papillae

27
Q

lacrimal canaliculi

A

Small ducts that extend from the lacrimal puncta to the nasolacrimal sac

28
Q

Nasolacrimal sac

A

Small saclike structure of the anterior medial margin of the orbital floor

receives the lacrimal canaliculi

29
Q

nasolacrimal duct

A

Drains the lacrimal sac into the inferior meatus of the nasal cavity

30
Q

Eyelids

A

Musculofibrous folds in front of each
Tarsal plate
Muscles
-Orbicularis oculi
-Levator palpebrae superioris

Anatomy Test 5 (2 decks)

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