Muscles of the eye Flashcards
List the extra ocular muscles of the eye noting their attachment point in the orbit, their individual nerve supply and one noted dysfunction for each muscle if their nerve supply is disrupted.
Levator? Superior?
Levetator palpebrae superioris- O:Comes from the lesser wing of the sphenoid bone above the optic foramen. A: superior tarsal plate of upper eyelid. Innervated by CN III.
Damage inability to raise the eyelid.
Superior rectus – O: common tendinous ring A:Sclera of eyeball
Supplied by CN III . Damage would give failure or elevation (depressed eye)
List the extra ocular muscles of the eye noting their attachment point in the orbit, their individual nerve supply and one noted dysfunction for each muscle if their nerve supply is disrupted.
(inferior, lateral, medial?)
inferior rectus, - O: inferior part of common tendinous ring, A: Inferior and anterior aspect of the sclera.
CNIII damage would include failure to depress eyeball
lateral rectus – A: lateral part of CTR. A: antero lateral part of sclera. CN VI (abducens) Failure to abduct the eyeball.
medial rectus, - O: Medial part of CTR A: antero medial ascpect of sclera
CN III failure to adduct eyeball.
List the extra ocular muscles of the eye noting their attachment point in the orbit, their individual nerve supply and one noted dysfunction for each muscle if their nerve supply is disrupted.
(obliques)
inferior oblique O: anterior aspect of orbital floor A: attaches to sclera of the eye
CN III – failure to elevate , abduct , laterally rotate
superior oblique. O: Body of sphenoid bone
A: Sclera of the eye
CN IV – failure to depress, abduct and medially rotate.
Describe damage to nerves that would affect the eye
Damage to CNIII gives down and out position. By Lateral rectus and Superior Oblique.,
Damage to CN IV – Paralyses Superior oblique. May cause double vision/ head tilt away from side.
Damage to CN VI Paralyzes the Lateral rectus , giving the eye an adducted position from medial rectus.
