[ANAT] NERVES OF ORBIT Flashcards by Aseel Maher

nerve of vision

optic nerve

How well did you know this?

Not at all

Perfectly

smallest division of trigeminal purely sensory

ophthalmic

How well did you know this?

Not at all

Perfectly

optic nerve is made up on

axons of ganglionic layer of retina

How well did you know this?

Not at all

Perfectly

optic nerve piecers sclera at

3mm medial to posterior pole

How well did you know this?

Not at all

Perfectly

optic nerve is enclosed in?

3 meningeal sheaths

How well did you know this?

Not at all

Perfectly

optic nerve lacks

neurilemmal sheath
(can’t regenerate+ is a tract)

How well did you know this?

Not at all

Perfectly

length & parts of optic nerve

40mm
intraorbital= 25mm
intracanalicular= 5mm
intracranial=10mm

How well did you know this?

Not at all

Perfectly

reason behind tortuosity of optic nerve

allows free movement of eyeball

How well did you know this?

Not at all

Perfectly

optic nerve is surrounded by

recti muscles (@ apex)
short ciliary nerves
fat

How well did you know this?

Not at all

Perfectly

ciliary ganglion location

between optic nerve & tendon of LR

How well did you know this?

Not at all

Perfectly

optic nerve is pierced by?

central retinal artery & vein

How well did you know this?

Not at all

Perfectly

optic nerve is crossed by

N-O-S
nasociliary nerve
ophthalmic artery
superior div ophthalmic vein

How well did you know this?

Not at all

Perfectly

relation of optic nerve to ophthalmic artery inside optic canal

above & medial to ophthalmic artery

How well did you know this?

Not at all

Perfectly

relation of optic nerve to ICA inside cranial cavity

ICA is lateral to optic nerve

How well did you know this?

Not at all

Perfectly

intra-orbital blood supply of optic nerve

posterior ciliary arteries
central retinal artery

How well did you know this?

Not at all

Perfectly

intra-canalicular blood supply of optic nerve

ophthalmic artery

How well did you know this?

Not at all

Perfectly

intracranial blood supply of optic nerve

superior hypophyseal artery

How well did you know this?

Not at all

Perfectly

unilateral papilloedema is a sign of

optic neuritis

How well did you know this?

Not at all

Perfectly

bilateral papilloedema is a sign of

increased ICT

How well did you know this?

Not at all

Perfectly

aneurysm of ___can lead to lesion in optic chiasma

ICA

How well did you know this?

Not at all

Perfectly

nerves passing through lateral wall of cavernous sinus

T-O-O
trochlear
ophthalmic
oculomotor

How well did you know this?

Not at all

Perfectly

branches of ophthalmic nerve

lacrimal
frontal
nasociliary

How well did you know this?

Not at all

Perfectly

supplies lacrimal gland & lateral part of upper eyelid

lacrimal n (ophthalmic)

How well did you know this?

Not at all

Perfectly

smallest branch of ophthalmic

lacrimal

How well did you know this?

Not at all

Perfectly

supplies skin of forehead & upper eyelid

supratrochlear n (ophthalmic)

supplies frontal air sinus

supraorbital (ophthalmic)

supplies skin of forehead + scalp up to vertex + frontal air sinus

supraorbital n (ophthalmic)

supplies lateral part of upper eyelid

supratrochlear n (ophthalmic)

supplies cornea, iris, ciliary body

large ciliary nerves (nasociliary of ophthalmic)

supplies ethmoidal & sphenoidal air sinuses

posterior ethmoidal nerve (nasociliary of ophthalmic)

supplies skin of upper eyelid + side of nose

infratrochlear nerve (nasociliary of ophthalmic n)

only nerve to decussate

trochlear

largest branch of ophthalmic

frontal

lacrimal & frontal nerves enter SOF through

lateral part

nasociliary nerve enters SOF through

medial part

runs above LR with lacrimal artery

lacrimal n (of ophthalmic)

runs between periosteum & LPS

frontal n (of ophthalmic)

lacrimal nerve receives communication from

ZT nerve (postganglionic secretomotor fibers of pterygopalatine ganglia)

pterygopalatine ganglia sends postganglionic secretomotor fibers to

lacrimal nerve (of ophthalmic)

branches of frontal nerve

supratrochlear supraorbital

intermediate branch of ophthalmic

nasociliary

nasociliary crosses

optic nerve (Lat--->Med)

nasociliary is situated between

2 divisions of oculomotor

branches of nasociliary (5)

infratrochlear long ciliary posterior ethmoidal anterior ethmoidal communicating branch

branch forming the sensory root of the ciliary ganglion

communicating branch of nasociliary n (of ophthalmic)

nerve carrying MOTOR SYMPATHETIC fibers to dilator pupillae

long ciliary

anterior ethmoidal course and branch?

anterior ethmoidal foramen--> cranial cavity--> cribriform plate--> crista galli--> nasal cavity leaves nasal cavity as external nasal nerve

oculomotor attachment to brain

anterior midbrain medial side of cerebral peduncle

oculomotor is situated between

superior cerebellar artery PCA

nerve piercing dura IN FRONT of crossing of tentorium cerebelli

3rd

nerve piercing dura AT point of crossing of tentorium cerebelli

4th

nerve piercing dura opposite the clivus

6th

superior division of oculomotor supplies

SR LPS

inferior division of oculomotor supplies

IO IR MR

nerve sending MOTOR PARASYMPATHETIC fibers to constrictor pupillae & ciliary muscles

nerve to inferior oblique

oculomotor palsy cc by? (6)

ptosis diplopia proptosis loss of accommodation lateral squint dilatation

trochlear nerve supplies

CONTRALATERAL SO

emerges from dorsal aspect of brainstem below inferior colliculus

trochlear

trochlear nerve is situated between

superior cerebellar artery & PCA

trochlear nerve enters orbit through

SOF OUTSIDE tendinous ring

diplopia when walking down the stairs

trochlear nerve palsy

trochlear nerve palsy cc by?

diplopia

attached to medial lower border of pons

abducent

runs through cisterna pontis

abducent

abducent nerve's relation to ICA intracranially?

infero-lateral to ICA

abducent nerve supplies

abducent nerve palsy cc by?

medial squint diplopia

parasympathetic supply to

constrictor pupillae ciliary muscles

sympathetic supply to

dilator pupillae LPS

secretomotor supply to

lacrimal gland

motor parasympathetic fibers are carried on

nerve to inferior oblique

sympathetic fibers are carried on

long ciliart muscles

sympathetic root is a branch of

ICA plexus

sensory root is a branch of

nasociliary nerve

dilator pupillae sympathetic supply is through

long ciliary nerves superior cervical plexus

short ciliary muscles contain (3)

efferent postgang parasympathetic efferent postgang sympathetic afferent sensory from eyeball

pathway of sensory root carrying impulses from eye

eye--> short ciliary nerve--> ciliary ganglion--> ophthalmic nerve--> V ganglion--> V sensory root--> V sensory nuclei