Extrinsic Ocular Muscles Flashcards
1
Q
6 muscles
A
Superior rectus
Inferior rectus
Medial rectus
Lateral rectus
Superior oblique
Inferior oblique
2
Q
Nervous control
A
1 motor neurone controls 3-10 muscle cells vs up to 1000 in general skeletal muscles
3
Q
EMO Function
A
To produce precise and coordinated eye movements, maintaining binocular vision
4
Q
Original of 4 rectus muscles
A
Annulus of Zinn
5
Q
Rectus muscles distance from limbus
A
S.R; 7.5mm
L.R; 7.00mm
M.R; 5.5mm
I.R; 6.5mm
6
Q
Muscle lengths
A
S.R; 42mm (longest rectus)
I.R; 40mm (shortest rectus)
M.R; 41mm
L.F; 41mm
S.O; 60-65mm (longest EOM)
I.O; 37mm (shortest EOM)
7
Q
Nerve supply
A
S.R and I.O = superior oculomotor CNIII
M.R and I.F = inferior oculomotor CNIII
L.R = Abducent CNVI
S.O = Trochlear CNVI
