Adnexa of the eye

Question 1

palpebral fissure

Answer 1

space between eyelids when open

Question 2

3 layers making up eyelid

Answer 2

skin
musculofibrous
palpebral conjunctiva

Question 3

tarsal plate

Answer 3

stiff plate of connective tissue supporting free edge of each lid

Question 4

tarsal gland

secretion

Answer 4

found in upper and lower lids

secrete waxy substance to prevent tears from spilling out the eye

Question 5

orbicularis oculi

Answer 5

close eye

Question 6

superciliaris

Answer 6

lifts upper eyelid and brow

Question 7

retractor anguli oculi/bulbi

Answer 7

draws lateral palpebral angle posterior

Question 8

nerve supply to orbicularis oculi, superciliaris, retractor bulbi

Answer 8

palpebral branch, auriculopalpebral facial nerve

CNVII SVE

Question 9

levator palpebrae superioris

Answer 9

lift upper eyelid

oculomotor CN III SE

Question 10

nerve supply to smooth muscle of upper and lower eyelids

Answer 10

sympathetic - AE from cranial cervical ganglion

Question 11

sensory supply to eye region

Answer 11

ophthalmic trigeminal to upper

maxillary trigeminal to lower

Question 12

where is lacrimal gland?

Answer 12

dorso-lateral aspect of eye

Question 13

where are the lacrimal ducts located?

Answer 13

dorsally and ventrally of the medial canthus

Question 14

nerve supply to lacrimal gland, secretions

Answer 14

parasympathetic AE facial nerve onto ophthalmic trigeminal
sympathetic - cranial cervical ganglion
serous and mucous fluid moisten eyes and supplies cornea

Question 15

how do tears drain

Answer 15

via nasolacrimal duct -
from lacrimal lake to lacrimal sac, into lacrimal duct then nasal cavity
runs through wall of maxilla then on internal mucosa covered surface opens dorsolateral wall of nostril

Question 16

which gland is nictitating membrane associated with?

Answer 16

lacrimal gland

Question 17

periorbital fascia

Answer 17

cone shaped fibrous tunic surrounds the eye and extra ocular muscles

Question 18

3 layers of periorybital fascia

Answer 18

periorbita
superficial muscular fascia
deep muscular fascia

Question 19

muscles of the eye

Answer 19

4 rectus - dorsal ventral medial and lateral
2 oblique - dorsal and ventral
retractor bulbi

Question 20

insertions of rectus muscles

Answer 20

rostral to equator

Question 21

insertions of oblique muscles

Answer 21

rostral to equator

Question 22

insertion of retractor bulbi

Answer 22

caudal to equator

Question 23

origins of eye muscles

Answer 23

all except ventral oblique originate from optic canal and orbital fissure
ventral oblique - ventromedial wall of orbit

Question 24

nerve supply to rectus muscles

Answer 24

CNIII

Question 25

nerve supply to dorsal oblique

Answer 25

trochlear CNIV

Question 26

nerve supply to ventral oblique and retractor bulbi

Answer 26

abducent CNVI