Orbit Anatomy

Question 1

Bones of the Orbit

Answer 1

Frontal, Ethmoid, Lacrimal, Maxilla, Palatine, Zygomatic, Sphenoid

Question 2

Base of the orbit

Answer 2

Zygomatic

Question 3

Fracture of zygomatic causes

Answer 3

eyeball to protrude

Question 4

Most structures enter orbit through

Answer 4

Superior orbital fissure

Question 5

Optic nerve enters through

Answer 5

Optic forament

Question 6

What passes through the lacrimal fossa?

Answer 6

lacrimal duct

Question 7

supraorbital arteries and nerve go through?

Answer 7

supraorbital foramen

Question 8

Skeleton of eyelid is?

Answer 8

Superior and inferior tarsal plates (CT skeleton)

Question 9

Tarsal glands

Answer 9

keep eyelids for sticking to each other-produce oil secretion

Question 10

Sebaceous glands are associated with?

Answer 10

eyelashes

Question 11

Palebral part of the orbicularis oculi is within ?

Answer 11

the eyelids

Question 12

Upper eyelid muscle only

Answer 12

LEvator palpebrae superioris

Question 13

orbicularis oculi has two parts:

Answer 13

orbital part and palpebral part

Question 14

orbicularis oculi (palpebral part) fx

Answer 14

used for blinking

Question 15

Levator palpebrae superioris fx

Answer 15

raise the eyelid

Question 16

orbicularis oculi innervated by cranial nerve?

Answer 16

XII

Question 17

levator palpebrae superioris innervated by cranial nerve?

Answer 17

III

Question 18

Lacrimal gland is located

Answer 18

superficially under skin, lateral superior to the eye

Question 19

Function of lacrimal gland

Answer 19

produces tears

Question 20

tears flow?

Answer 20

From superior lateral, to inferior medial

Question 21

tears are collected by?

Answer 21

lacrimal lake/ lacrimal caruncle, lacrimal papillae, lacrimal canaliculi, lacrimal sac (dilated upper end of nasolacrimal duct), duct takes fluid into the inferior nasal concha

Question 22

What is the conjuctiva?

Answer 22

The mucous membrane lining the eyelids and the eyeball (over sclera)

Question 23

Innervation of superior rectus

Answer 23

CN III

Question 24

Fx of superior rectus

Answer 24

rotate pupils superiorly and medially

Question 25

Innervation of medial rectus

Answer 25

CN III

Question 26

Fx of medial rectus

Answer 26

roates pupils medially

Question 27

Innervation of lateral rectus

Answer 27

CN VI

Question 28

Fx of lateral rectus

Answer 28

rotates pupil laterally

Question 29

Innervation of inferior rectus

Answer 29

CN III

Question 30

Fx of inferior rectus

Answer 30

rotates pupils inferiorly and medially

Question 31

Innervation of superior oblique

Answer 31

CN IV

Question 32

Fx of superior oblique

Answer 32

rotate pupils laterally and inferiorly

Question 33

Innervation of inferior oblique

Answer 33

CN III

Question 34

Fx of inferior oblique

Answer 34

rotates pupils laterally and superiorly

Question 35

Innervation of Levator Palpebrae superioris

Answer 35

CN III

Question 36

Fx of the levator palpebrae superioris

Answer 36

raises the upper eyelid

Question 37

NERVE SUPPLY TO EXTRAOCULAR MUSCLES

Answer 37

SO4 LR6 (III)

Question 38

O/I of superior/inferior/medial/lateral rectus muscles

Answer 38

O: common tendinous ring/ I: eyeball

Question 39

Which extraocular muscle never attaches to the eyeball but instead to the eyelid

Answer 39

levator palpabrae superioris

Question 40

superior oblique muscle is called the salvation army muscle because the action of it is?

Answer 40

down and out

Question 41

What supplies the orbit?

Answer 41

ophtalmic branch of the internal carotid

Question 42

What are the main branches of the ophthalmic artery?

Answer 42

lacrimal, supraoribital, ethmoidal, supratrochlear

Question 43

facial veins make connection with?

Answer 43

opthalmic vein (including the cavernous sinus) and pterygoid plexus

Question 44

Facial veins do not have?

Answer 44

valves, infection can spread up them