Sensory and motor nerves of orbit

Question 1

بسم الله الرحمن الرحيم
Sensory supply of orbit ?

Answer 1

Optic nerve
branches of Opthalmic nerve

Question 2

Motor supply of orbit ?

Answer 2

3,4,,6 Cranial nerves

Question 3

Optic nerve formed of ?

Answer 3

Axons of cells of ganglioninc layer of retina then through optic canal to enter middle cranial fossa forming? Optic chiasma with its fellow from other side

Question 4

Parts of Optic nerve?

Answer 4

Intra-Orbital 25mm
intra-canalicular 5mm
intra cranial 15 mm

Question 5

Intra-Orbital part
is tortous why ? /
at apex its related to ?
Ciliary ganglion lie between the optic nerve and …….. rectus ?
It is pierced by ?
crossed by ? (O2N)

Answer 5

Tortuous for free movement of eyeball
At apex surrounded by recti
Lateral rectus
pierced by? Central artery and vein of retina
Crossed by? VAN Opthalmic artery and Superior OPthalmic vein and nasociliary nerve

Question 6

IntraOrbital Optic nerve crossed by?

Answer 6

Opthalmic artery
superior opthalmic vein
nasociliary nerve

Question 7

In the optic canal the OPtic nerce lies ……. to opthalmic artery?

Answer 7

Above and medial to opthalmic artery

Question 8

In the cranial caviry internal carotid artery lies on lateral side of …. nerve?

Answer 8

Optic

Question 9

Opthalmic nerve passes through ,,,,walll of cavenous sinus ?

Answer 9

Lateral

Question 10

Mention branches of OPthlamic nerve of Trigiminal

Answer 10

Lacrimal
Frontal
Nasociliary

Question 11

Opthlamic nerve enter the orbit through ?

Answer 11

Superior Orbital fissure with ? CN346

Question 12

Lacrimal nerve :-The smallest branch of opthalmic
Enter the orbit via …….. runs forward along the …..wall of orbit above,,,,,,rectus with ………….(vessel).?
Recevis a communication from ……..nerve postganglionic secremotor fibers to lacrimal gland from……ganglion ?

Answer 12

Superior orbital fissure -lateral wall -abve lateral rectus – with Lacrimal artery

Receving from zygomatico-temporal nerve
from pterygopalatine ganglion

Question 13

Mention structures supplied by Lacrimal nerve

Answer 13

Lacrimal gland + Lateral skin of upper eyelid

Question 14

Largest branch of Opthalmic nerve is ……
enering the orbit thorugh,,,,,,,,,,,,,,runs on the ,,,,,,of orbit between ,,,,,and,,,,,,
Giving 2 branches :
1-.;……
2……..

Answer 14

Frontal nerve
Lateral superior orbital fissuere - on the roof- between periosteum + Levator palpabrae superioris
Giving 2 branches : -
SupraTrochlear
SupraOrbiral nerves

Question 15

SupraTrochlear nerve describe

Answer 15

one of branches of Frontal of Opthalmic
supplying forehead + upper eyelid

Question 16

SupraOrbital nerve describe

Answer 16

One of branches of frontal of opthalmic
Supplying (Frontal air sinus) + (forehead and scalp up to the vertex ).

Question 17

Branches of Nasociliary nerve mention

Answer 17

AIP LO NAS
_________________
Anterior ethmoidal
Posterior ethmoidal nerves
Infratrochlear nerve
Long ciliary nerve
Nasociliary nerve
Sensory root of ciliary ganglion
______________________________

Question 18

Entering the ortbit through medial superior orbital fissure between 2 divisions of Occlumotor nerve ?

Answer 18

Nasociliary nerve of Opthalmic

Question 19

Crossing the optic nerve with opthalmic artery from lat to medial side?

Answer 19

Nasociliary nerve
runnging along medial wall of Orbit

Question 20

Occlumotor nerve Arising from the anterior surface of ,,,,,,,
Runing on the lateral wall of ……… divedid into Superior and inferior divisons :
Both eneters the orbit through ,,,,,,,,,within,,,,,,,,,, enclosing ,,,,,nerve
Superior diivsion supply ?
inferio dicvsion supply ?

Answer 20

Midbrain
__________________
Cavernous sinus
__________________
superior Orbital fissure within common tendious ring enclosing the nasociliary nerve
_______________________________________
Superer divsion supply SR & LPS
Inferio dicsion supply IR IO and MR

Question 21

Ciliary ganglion recevies Motor parasympathatic fibers from …….. nerve ? suplying which muscles?

Answer 21

Nerve to Inferiior oblique of Inferio division of Occlumotor
supplying Ciliary muscle + Shpinchter pupillae

Question 22

Compelete paralysis of Occulmotor leads to ?

Answer 22

Ptosis
Lateral squint diplopia
Loss of accomodation
Pupil dilatation
Slight proptosis

Question 23

The only cranial nerve emerging from the dorsal aspect of brain stem ?

Answer 23

Trochlear nerve then decussates to reach the anterior aspect

Question 24

A nerve passing between 2 arterires : Superior cerebellar and posteiror cerebral arteries ?

Answer 24

Trochlear nerve
occlumoto emergere between the two

Question 25

Running along lateral wall of cavernous sinus enetring the orbit through superior orbital fissure OUTSIDE ! common tendinous ring and passes to supply Superior oblique muscle

Answer 25

It is Trochlear! ^_^

Question 26

Nerve attached to medial lower boreder of pons ?

Answer 26

Abducent CN6

Question 27

Abducent :
Crosses near the apex of petrous temporal bone then in the floor of cavernous sinus InferoLaterally to ?<
Entering the orbit throgh ,,,,,,,? within ………. to supply ,,,,,,,,,,, ?

Answer 27

Inferolaterally to ICA in the floor of cavenrous sinus
superior orbital fissure within common tendious ring to supply Lateral rectus

Question 28

Paralysis of Abducent ?

Answer 28

Medial squint
Diplopia

Question 29

Autonomic nerves in the orbit mention

Answer 29

Parasympathtic to ciliary and sphincter pupillae
sympathatic to ? LPS + Dilatoor pupillae
Secretomotor to ? Lacrimal gland

Question 30

Ciliary ganglion describe

Answer 30

Near the apex of orbit between optic nerve and LR muscles :-
1-Edinger wetephal neculeus gives fibers to occulumotor paraymp then to inferio divsion then to Neve to IO then gives communication to ciliary ganglion relying then postganglioninc parasymp arise to supplty ? Sphicter pupillae and Ciliary muscle
2-Carotid Pleux gives symp root to the ciliary ganglion without relay to be postganglioicsymp to Dilator pupillar and BVs
3-Sensations from orbit go in afferent called short ciliary nerves entering ciliary ganglion iwthout relay to reach nasocilary nerve to opthalmic of trigmenial

Question 31

الحمدلله رب العالمين