The eye (globe) is attached to the orbit by 4 rectus & 2 oblique muscles that collectively allow rotary movement and vision in many directions. These muscles are innervated by 3 cranial nerves (Thread) 
The superior oblique (SO) muscle is innervated by the trochlear nerve (CNIV). The SO depresses, turns the eye laterally and causes medial rotation.
The inferior oblique (IO) muscle is innervated by the oculomotor nerve (CNIII). The IO causes lateral rotation, elevation and aBduction
The lateral rectus (LR) muscle is innervated by the abducens nerve (CNVI). The LR aBducts the eye.
The inferior rectus (IR) is innervated by the oculomotor nerve (CNIII). The IR assists with lateral rotation and aDduction.
The superior rectus (SR) is also innervated by the oculomotor nerve (CNIII). The SR aids with medial rotation and aDduction.
The medial rectus (MR) is innervated by the oculomotor nerve (CNIII). The MR aDucts the eye
A useful mnemonic to aid recalling these nerves is "SO4LR6 all the rest 3"
SO - CNIV
LR - CNVI
IO, IR, SR, MR, - CNIII
SO - CNIV
LR - CNVI
IO, IR, SR, MR, - CNIII
• • •
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