orbit

Question 1

palpebral conjunctiva attaches to the eyeball at the

Answer 1

junction of cornea and sclera

Question 2

medial rectus m

Answer 2

• action: in

- nerve: CN3

Question 3

sensory innervation to eye

Answer 3

-can go either through ciliary ganglion or through long ciliary n (combined with nasociliary n fibers)

Question 4

lipid secretion in the eyelid

Answer 4

tarsal glands embedded in tarsus

Question 5

three ways that inferior ophthalmic v can drain

Answer 5

1) join superior ophthalmic v
2) cavernous sinus
3) pterygoid plexus of veins

Question 6

what two nerves supply the lacrimal gland

Answer 6

• zygomatic n (carrying fibers from greater petrosal and deep petrosal)
• lacrimal n (CNV1)

Question 7

lacrimal a supplies

Answer 7

• lacrimal gland

- mm, conjunctive, and lateral sides of eyelid

Question 8

inferior rectus m

Answer 8

• action: down and in

- nerve: CN3

Question 9

lateral rectus m

Answer 9

• action: out

- nerve: CN6**

Question 10

inferior oblique m

Answer 10

• action: up and out

- nerve: CN3

Question 11

superior rectus m

Answer 11

action: up and in
innervation: CN3

Question 12

superior tarsal m

Answer 12

• origin: levator palpebrae superioris m
• insertion: superior tarsus
• innerv: superior cervical ganglion (travel with ophthalmic a)

Question 13

superior venous drainage of eyes is into

Answer 13

cavernous sinus

Question 14

nerve innervation to lacrimal gland

Answer 14

• greater petrosal + deep petrosal = nerve to pterygoid canal
• synapse at PP ganglion
• fibers travel with zygomatic n (CNV2)
• branch of zygomatic n joins lacrimal n

Question 15

superior oblique m

Answer 15

• action: down and out

- nerve: CN4***

Question 16

levator palpebrae superioris m

Answer 16

• origin: lesser wing of sphenoid
• insertion: superior tarsus and skin of upper eyelid
• action: raises upper eyelid
• nerve: CN 3

Question 17

eyelids are covered externally by ___ and internally by ___

Answer 17

externally by skin and internally by palpebral conjunctiva

Question 18

lesion to superior cervical ganglion results in

Answer 18

partial drooping (ptosis) of eyelid

Question 19

anterior ethmoidal a (branch of ophthalmic a) supplies

Answer 19

• frontal sinus
• ethmoidal cells
• medial and lateral wall of nasal cavity
• external nasal a: dorsum and ala of nose

Question 20

parasymp innervation to eye

Answer 20

oculomotor

Question 21

supra-orbital a (branch of ophthalmic a) supplies

Answer 21

• upper eyelid
• forehead
• scalp to vertex

Question 22

supra-orbital v and infra-orbital v drain by

Answer 22

facial v or superior ophthalmic v

Question 23

3 branches of CNV1

Answer 23

• frontal n
• nasociliary n
• lacrimal n

Question 24

posterior ethmoidal a (branch of ophthalmic a) supplies

Answer 24

• ethmoidal cells
• sphenoidal sinus
• lateral wall of nasal cavity
• septum

Question 25

symp innervation to eye

Answer 25

- from symp cervical ganglion | - can go either through ciliary ganglion or through long ciliary n (combined with nasociliary n fibers)

Question 26

what passes through superior orbital fissure and through the common tendinous ring

Answer 26

- oculomotor n (CN3) - nasociliary n - abducens n (CN6)

Question 27

what two muscles are found in the upper eyelid

Answer 27

1) levator palpebrae superioris m | 2) superior tarsal muscle

Question 28

which nerves and vessels pass through the superior orbital fissure but not through the common tendinous ring

Answer 28

- frontal n - lacrimal n (CN V1) - superior ophthalmic v - trochlear n (CN4)

Question 29

lesion to the superior tarsal m results in

Answer 29

partial drooping (ptosis) of eyelid

Question 30

lesion to ocolomotor may result in what to the upper eyelid

Answer 30

drooping (ptosis) of the upper eyelid

Question 31

supratrochlear a (branch of ophthalmic a) supplies

Answer 31

- upper eyelid - forehead - scalp (medially)

Question 32

ophthalmic a is a branch of

Answer 32

ICA