Eye

Question 1

Orbits borders

Answer 1

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

Question 2

orbit base

Answer 2

orbital margin surrounding the orbital opening

Question 3

orbit walls and apex

Answer 3

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

apex- optic canal

Question 4

contents of orbit

Answer 4

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

Question 5

concentric layers of tissue

Answer 5

encloses the lens, vitreous body, and aqueous humor

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

Question 6

external fibrous tunic

Answer 6

composed of the cornea and sclera

Question 7

cornea

Answer 7

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

Question 8

sclera

Answer 8

posterior opaque part of the fibrous tunic

Receives tendon of the muscles of the eye

Question 9

middle vascular tunic

Answer 9

(uvea)

choroid
ciliary body
iris

Question 10

choroid

Answer 10

brown coat that lines the posterior two thirds of the sclera

Question 11

ciliary body

Answer 11

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

Question 12

iris

Answer 12

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

Pigment cells responsible for color

Question 13

internal nervous tunic (retina)

Answer 13

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

Question 14

Aqueous humor

Answer 14

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

Question 15

Lens

Answer 15

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

Question 16

Vitreous humor

Answer 16

clear liquid that fills the space posterior to the lens

Question 17

Rectus muscles

Answer 17

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

Question 18

Extraocular muscles

Answer 18

superior oblique
Inferior oblique

Question 19

superior oblique

Answer 19

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

Question 20

inferior oblique

Answer 20

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

Question 21

Ophthalmic nerve

Answer 21

CNV V1

Three Divisions
lacrimal nerve
frontal nerve
Nasociliary nerve

Question 22

Ciliary ganglion

Answer 22

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

Question 23

Vascular supply

Answer 23

ophthalmic artery

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

Question 24

lacrimal apparatus

Answer 24

Location- anterior superlateral corner of orbit

Question 25

lacrimal papillae

Answer 25

Small hillocks at the medial end of each eyelid

Question 26

lacrimal puncta

Answer 26

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

Question 27

lacrimal canaliculi

Answer 27

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

Question 28

Nasolacrimal sac

Answer 28

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

receives the lacrimal canaliculi

Question 29

nasolacrimal duct

Answer 29

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

Question 30

Eyelids

Answer 30

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