Orbit 2

Question 1

what are the sensory nerves present in the orbit ?

Answer 1

optic nerve

ophthalmic nerve

Question 2

what are the motor nerves present in the orbit

Answer 2

abducent
trochlear
oculomotor

–maxillary nerve does not supply the orbit , it supplies the skin of the face

Question 3

the optic nerve enters the optic canal accompanied by __

Answer 3

ophthalmic artery

Question 4

what is the optic nerve surrounded by?

Answer 4

meninges (covering of the brain) and the subarachnoid space containing CSF

Question 5

What muscles does the optic nerve run along ?

Answer 5

cone of the recti muscles , it then pierces the sclera at a point medial to the posterior pole of the eyeball . here the meninges fuse with the sclera

Question 6

what is the smallest of the 3 divisions of the trigeminal nerve ?

Answer 6

ophthalmic nerve

Question 7

where does the ophthalmic arise from ?

Answer 7

arises from the superomedial part of the trigeminal ganglion

Question 8

the ophthalmic nerve runs in the lateral wall of the cavernous sinus and divides into :

Answer 8

frontal nerve
lacrimal nerve
nasociliary nerve

Question 9

what muscles does the lacrimal nerve run along ?

Answer 9

upper border of lateral rectus

Question 10

what does the lacrimal nerve supply ?

Answer 10

lacrimal gland , and skin of the lateral part of the upper eyelid

Question 11

what muscle does the frontal nerve run along ?

Answer 11

superior surface of the levator palpebrae superioris

Question 12

what are the divisions of the frontal nerve ?

Answer 12

just before the orbital margin it divides into the supretrochlear nerve and the supra-orbital nerve

Question 13

what is the most medial nerve in the orbit ?

Answer 13

nasociliary nerve

Question 14

nasociliary nerve Crosses above the optic nerve with the ophthalmic artery, to reach the medial wall of the orbital cavity

Answer 14

..

Question 15

what muscle does the nasociliary nerve run along with ?

Answer 15

runs forward along the upper margin of the medial rectus, and ends by dividing into the anterior ethmoidal & infratrochlear nerves

Question 16

what does the oculomotor nerve go through in order to get to the orbit ?”

Answer 16

enters the orbit through the lower part of the superior orbital fissure ( as 2 divisions )

Question 17

what muscle does the trochlear nerve run across?

Answer 17

origin of the levator palpebrae superioris

Question 18

frontal
lacrimal
trochlear = upper part of superior orbital fissue

nasociliary
oculomotor
abducenrt = lower part

Question 19

what muscle does the trochlear nerve run forwards too and supplies?

Answer 19

lateral rectus

(legion of nerve leads to diplopia and medial squint

Question 20

what is the arterial supply of the orbit ?

Answer 20

ophthalmic artery (branch of INTERNAL carotid artery)

Question 21

what is the venous drainage of the orbit ?

Answer 21

superior and inferior ophthalmic veins , drain into the cavernous sinus