Orbit

Question 1

What are the orbital contents?

Answer 1

Eyeball, fat, connective tissues, extraocular muscles, nerves and blood vessels

Question 2

What is within the tarsal plates?

Answer 2

Dense connective tissue, support eyelid and glands

Question 3

What are the two ligaments in the eye?

Answer 3

Suspensory ligaments and check ligaments

Question 4

What does the suspensory ligament do?

Answer 4

Support eyeball

Question 5

What does the check ligaments do?

Answer 5

Restrict medial and lateral recti

Question 6

What is within the vascular layer of the eye?

Answer 6

Ciliary body and choroid

Question 7

What is the middle coat called?

Answer 7

Vascular layer

Question 8

What are the fibrous layer called?

Answer 8

Cornea and Sclera

Question 9

What is the inner layer called?

Answer 9

The Retina

Question 10

What is the Macula Lutea of the retina?

Answer 10

Fovea

Question 11

What does the retina contain?

Answer 11

Rods and cones

Question 12

What controls the blind spot in the retina?

Answer 12

Optic disc

Question 13

What is the function of the Aqueous humor?

Answer 13

Helps maintain intra-ocular pressure

Question 14

What is the Aqueous humor made of?

Answer 14

Ciliary body

Question 15

Where does the Aqueous humor drain into?

Answer 15

Corneo-scleral junction (Canal of Schlemm)

Question 16

Describe the Vitreous humor (body)

Answer 16

Embryological, Transparent jelly, posterior to lens and supports retina

Question 17

What are the Intraocular (intrinsic) muscles?

Answer 17

Dilator pupillae and Sphincter pupillae

Question 18

What does the Dilator papillae do?

Answer 18

Increases the diameter of the pupil

Question 19

What does the Sphincter pupillae do?

Answer 19

Decrease the diameter of the pupil

Question 20

What is the ciliary muscle?

Answer 20

Intrinsic eye muscle that changes the shape of the lens for accommodation

Question 21

What nerve passes through the ciliary muscle?

Answer 21

Oculomotor nerve

Question 22

How many extraocular muscles are there?

Answer 22

7

Question 23

What are the 7 extraocular muscles?

Answer 23

Levator Palpebrae,
Superior Rectus,
Inferior Rectus,
Medial Rectus,
Lateral Rectus,
Superior Oblique and Inferior Oblique

Question 24

What is the action of the Levator Palpebrae?

Answer 24

Raise upper eyelid

Question 25

What is the action of the Superior Rectus?

Answer 25

Elevation, Adduction and intorsion

Question 26

What is the action of the Inferior Rectus?

Answer 26

Depression, Adduction and extorsion

Question 27

What is the action of the Medial Rectus?

Answer 27

Adduction

Question 28

What is the action of the Lateral Rectus?

Answer 28

Abduction

Question 29

What is the action of the Superior Oblique?

Answer 29

Intorsion, depression an abduction

Question 30

What is the action of the Inferior Oblique?

Answer 30

Extorsion, Elevation and abduction

Question 31

What innervates Levator Palpebrae, Superior rectus, Inferior Rectus, Medial Rectus and Inferior Oblique?

Answer 31

Oculomotor nerve

Question 32

What innervates the Lateral Retus?

Answer 32

Abducent

Question 33

What innervates the Superior Oblique?

Answer 33

Trochlear

Question 34

Where is the elevator pa;pebrae superioris?

Answer 34

From orbital roof to upper eyelid

Question 35

Where is the Superior, Inferior, medial and lateral reach from?

Answer 35

Annular ring to sclera

Question 36

Where is the Superior Oblique from?

Answer 36

Lesser wing sphenoid to sclera

Question 37

Where is the Inferior Oblique from?

Answer 37

Orbital floor to sclera

Question 38

Why are the axes of orbit and optical axis different?

Answer 38

So eye muscles can move in more than one direction

Question 39

Describe the Lacrimal Apparatus?

Answer 39

Where tears come from. Secretomotor fibres from facial nerve carried in trigeminal