Orbit and eye

Question 1

Extrinsic muscles of the eye?

Answer 1

Superior rectus 
Medial rectus 
Inferior rectus 
Lateral rectus 
Superior oblique 
Inferior oblique 
Levator palpebrae superioris

Question 2

Extrinsic muscle which does not insert onto the eye?

Answer 2

Levator palpebrae superioris

Question 3

Innervation of lateral rectus?

Answer 3

Abducent nerve

Question 4

Innervation of superior oblique?

Answer 4

Trochlear nerve

Question 5

Innervation of superior rectus muscle?

Answer 5

Oculomotor

Question 6

Innervation of inferior oblique muscle?

Answer 6

Oculomotor

Question 7

Bones forming the orbit?

Answer 7

Frontal
Ethmoid
Sphenoid 
Lacrimal
Zygomatic 
Maxillary

Question 8

Main contents of the orbit?

Answer 8

The eyeball
Extrinsic muscles of the eye 
Cranial nerves III, IV, VI and branches of trigeminal nerve
Orbital fat
Branches of internal carotid artery 
Lacrimal apparatus 
Ligaments supporting the eye

Question 9

Three layers of the eye?

Answer 9

Outer fibrous layer
Middle vascular layer
Internal sensory layer

Question 10

Components of fibrous layer?

Answer 10

Sclera (white of the eye)

Cornea

Question 11

Components of vascular layer?

Answer 11

Choroid
Ciliary body
Iris

Question 12

Structure dividing eye into anterior and posterior segment?

Answer 12

Crystalline lens

Question 13

Fluid filling anterior segment of the eye?

Answer 13

Aqueous humour

Question 14

Fluid filling posterior segment of the eye?

Answer 14

Vitreous humour

Question 15

Subdivisions of anterior segment of the eye?

Answer 15

Anterior chamber

Posterior chamber

Question 16

Structure producing aqueous humour?

Answer 16

Ciliary body

Question 17

Function of aqueous humour?

Answer 17

Maintaining intraocular pressure

Question 18

Intraocular pressure?

Answer 18

21mmHg

Question 19

Function of vitreous humour?

Answer 19

Cushions the retina

Question 20

Intrinsic muscles of the eye?

Answer 20

Ciliaris
Constrictor pupillae
Dilator pupillae

Question 21

Structures preventing over-adduction or over-abduction of the eye?

Answer 21

Medial and lateral check ligaments

Question 22

Structure formed by blending of medial and lateral check ligaments with fascia of inferior extrinsic muscles?

Answer 22

Suspensory ligament of the eye

Question 23

Ophthalmic artery is a branch of?

Answer 23

Internal carotid artery

Question 24

Main blood supply to eye and orbit?

Answer 24

Ophthalmic artery

Question 25

Cranial nerves present in orbit?

Answer 25

``` Optic nerve (II) Oculomotor nerve (III) Trochlear nerve (IV) Abducent nerve (VI) Ophthalmic and maxillary branches of trigeminal nerve (V) ```

Question 26

Extrinsic muscle of the eye which does not originate from the posterior aspect of the orbit?

Answer 26

Inferior oblique

Question 27

Branch of ophthalmic artery which supplies inner retina?

Answer 27

Central retinal artery

Question 28

Anterior border of the retina?

Answer 28

Ora serrata

Question 29

Foramina at the apex of the orbit?

Answer 29

Optic foramen Superior orbital fissure Inferior orbital fissure

Question 30

Structures passing through optic foramen?

Answer 30

Optic nerve | Ophthalmic artery

Question 31

Cranial nerves passing through superior orbital fissure?

Answer 31

Oculomotor Trochlear Abducent Ophthalmic branch of trigeminal nerve

Question 32

Structure passing through inferior orbital fissure?

Answer 32

Maxillary branch of trigeminal nerve