G6 Eye/Orbit

Question 1

Membrane lining inner eyelid

Answer 1

Palpebral Conjunctiva

Question 2

Membrane lining surface of eye

Answer 2

Bulbar Conjunctiva

Question 3

Potential space between these membranes (palpebral conjunctiva and bulbar conjunctiva)

Answer 3

Conjunctival Sac

Question 4

Conjunctival reflections from eyelid to eye

Answer 4

Fornices

Question 5

Create fluid that keeps tears more viscous (evaporates less quickly)

Answer 5

Tarsal Glands

Question 6

Sebaceous gland; stye created on eyelid when this gland is blocked

Answer 6

Ciliary Gland

Question 7

Optic Canal contents:

Answer 7

CN II, Ophthalmic a.

Question 8

Superior Orbital fissure contents:

Answer 8

CN III, IV, V1, VI, Ophthalmic vv.

Question 9

Supraorbital notch/foramen contents:

Answer 9

Supraorbital n. (CN V1 branch) and a.

Question 10

Inferior orbital fissure contents:

Answer 10

Infraorbital n and zygomatic n (CN V2 branch) and a.

Question 11

Infraorbital foramen contents:

Answer 11

Infraorbital n. (CN V2 branch) and a.

Question 12

Ant. Ethmoid foramen contents:

Answer 12

Ant ethmoidal n. (CN V1 branch) and a.

Question 13

Post. Ethmoidal foramen contents:

Answer 13

Post. Ethmoid n. (CN V1 branch) and a.

Question 14

Thin middle layer of ciliary aa. and vorticose vv. (Middle eye)

Answer 14

Choroid

Question 15

Smooth m. around lens for accommodation (middle eye)

Answer 15

Ciliary body

Question 16

Colored smooth m. behind cornea controlling pupil size (middle eye)

Answer 16

Iris

Question 17

Adjustable aperture thru which light enters eye (middle eye)

Answer 17

Pupil

Question 18

Neural layer of eye which receives light rays (inner eye)

Answer 18

Retina

Question 19

Oval region of retina for visual acuity (yellow in color thus only visible with red-free light) (inner eye)

Answer 19

Macula Lutea

Question 20

Most acute vision site at center of macula lutea (inner eye)

Answer 20

Fovea Centralis

Question 21

Regions where CN II and retinal vessels enter/exit (inner eye, blind spot)

Answer 21

Optic disc

Question 22

Largely responsible for refraction of light in the eye (refractive media)

Answer 22

Cornea

Question 23

Focuses light rays and near/distant objects on retina (refractive media)

Answer 23

Lens

Question 24

Water filling anterior to lens (refractive media)

Answer 24

Aqueous humor

Question 25

Build up of aqueous fluid

Answer 25

Glaucoma

Question 26

Gelatinous filling posterior to lens (refractive media)

Answer 26

Vitreous humor (body)

Question 27

Produces lacrimal fluid (tears); flows across eye inferomedially to lubricate it (lacrimal apparatus)

Answer 27

Lacrimal gland

Question 28

Transports tears to lacrimal sac (lacrimal apparatus)

Answer 28

Lacrimal canaliculi

Question 29

Drains tears to nasolacrimal duct (lacrimal apparatus)

Answer 29

Lacrimal sac

Question 30

Drains tears thru nasolacrimal canal (under inferior nasal concha) (lacrimal apparatus)

Answer 30

Nasolacrimal duct

Question 31

Raises upper eyelid (extraocular muscle)

Answer 31

Levator Palpebrae superioris m.

Question 32

Elevates and adducts eye (extraocular muscle)

Answer 32

Superior rectus m.

Question 33

Depresses and adducts eye (extraocular muscle)

Answer 33

Inferior Rectus m.

Question 34

Abducts eye (extraocular muscle)

Answer 34

Lateral Rectus m.

Question 35

Adducts eye (extraocular muscle)

Answer 35

Medial Rectus m.

Question 36

Depresses and abducts eye (extraocular muscle)

Answer 36

Superior Oblique m.

Question 37

Elevates and abducts eye (extraocular muscle)

Answer 37

Inferior Oblique m.

Question 38

Caused by any lesion that leads to a loss of sympathetic function in the head. Characterized by miosis (constricted pupil), ptosis (droopy eyelid), etc.

Answer 38

Horner’s Syndrome

Question 39

Innervation to extraocular muscles

Answer 39

LR6(SO4)R3

Lateral Rectus CN VI

Superior Oblique CN IV

Rest of the muscles CN III

Question 40

Detects blindness, location of lesion determines deficit

Answer 40

Visual Field Testing

Question 41

Results in total blindness in affected eye

Answer 41

Optic n lesion

Question 42

Produces loss of peripheral vision

Answer 42

Optic chiasm lesion

Question 43

Results in ipsilateral nasal visual field loss and contralateral Temporal visual field loss

Answer 43

Optic tract lesion

Question 44

Ciliary ganglion receives p-symp from ____, supplies p-symp to ____ and ____

Answer 44

CN III

Ciliary m.
Pupillary Sphincter m.

Question 45

Tests CN II and CN III responses of pupil:

Answer 45

Pupillary Light Reflex

Question 46

3 Divisions of CN V1 in Orbit:

Answer 46

NFL

Nasociliary n.- ethmoidal n, infratrochlear n, long ciliary nn

Frontal n.- supraorbital n, supratrochlear n

Lacrimal n.- supplies lacrimal gland, conjunctiva

Question 47

Gives rise to all aa of eye

Answer 47

Ophthalmic a.

Question 48

Supplies outer and middle layers of eye (artery)

Answer 48

Posterior Ciliary aa

Question 49

Supplies inner layer of retina (artery)

Answer 49

Central Retinal a.

Question 50

Supply ant cranial fossa, nose, sinuses (artery)

Answer 50

Ethmoidal aa.

Question 51

Supplies central region of forehead (artery)

Answer 51

Supraorbital a.

Question 52

Supplies medial region of forehead (artery)

Answer 52

Supratrochlear a.

Question 53

Supplies lacrimal gland (artery)

Answer 53

Lacrimal a.

Question 54

Drains blood from upper medial orbit (most drainage thru here), will anastomose with facial v and drain into cavernous sinus

Answer 54

Superior Ophthalmic v.

Question 55

Drains from lower medial orbit, will anastomose with facial v and drain into cavernous sinus

Answer 55

Inferior Ophthalmic v.

Question 56

Drains from retina into cavernous sinus

Answer 56

Central Retinal v.

Question 57

Drains from vascular layer of eye into sup/inf ophthalmic vv

Answer 57

Vorticose vv.