Superior Rectus
Extraocular · Head & Neck
The superior rectus is one of the four recti of the extraocular muscles that move the eyeball. It arises from the superior part of the common tendinous ring, the annulus of Zinn, at the apex of the orbit and runs forward and laterally to insert into the superior sclera about 7.5 mm behind the corneal limbus. Because the orbit points forward and laterally while the muscle pulls along the orbital axis, its primary action is elevation of the eyeball, with secondary adduction and intorsion (medial rotation). It is supplied by the superior division of the oculomotor nerve (CN III).
Origin, Insertion, Action & Nerve
Origin
Superior part of the common tendinous ring (annulus of Zinn) at the orbital apex
Insertion
Superior sclera, ~7.5 mm posterior to the corneal limbus
Action
Elevates, adducts, and intorts (medially rotates) the eyeball
Nerve
Superior division of the oculomotor nerve (CN III)
Attachments explained
The Superior Rectus is defined first by where it attaches. Its origin is the more fixed anchor, usually the proximal or more stable end that stays put during contraction, while its insertion is the more mobile point that is pulled toward the origin when the muscle shortens.
Origin
Superior part of the common tendinous ring (annulus of Zinn) at the orbital apex
Insertion
Superior sclera, ~7.5 mm posterior to the corneal limbus
Action & function
When the Superior Rectus contracts, it produces the following movement: Elevates, adducts, and intorts (medially rotates) the eyeball.
As part of the Extraocular group of the Head & Neck, it works alongside neighbouring muscles to generate smooth, coordinated movement and to stabilise the structures it acts on.
Nerve supply & clinical relevance
The Superior Rectus receives its nerve supply from the Superior division of the oculomotor nerve (CN III).
Because a muscle can only contract when its nerve is intact, injury to the Superior division of the oculomotor nerve can weaken or paralyse the Superior Rectus, impairing the movements it normally produces (elevates, adducts, and intorts (medially rotates) the eyeball). This is why knowing the innervation is central to localising nerve lesions in clinical practice.
How to study the Superior Rectus (the OIANS method)
Study the superior rectus through the mismatch between the orbital axis and the visual axis: because the muscle pulls from behind and medial to the eye, elevation is strongest when the eye is already abducted, and its secondary actions of adduction and intorsion appear when the eye looks straight ahead. Reasoning from this geometry is far more reliable than memorising the three actions as a list.
Group it with the other muscles of the superior division of the oculomotor nerve, which also supplies the levator palpebrae superioris, and contrast it with the inferior rectus below. Remember the clinical test: to isolate the superior rectus, a patient abducts the eye and then looks up, which aligns the muscle with the visual axis and makes pure elevation easy to assess.
Frequently asked questions
Where is the Superior Rectus located?
The Superior Rectus is a muscle of the Extraocular group, located in the Head & Neck.
What is the origin of the Superior Rectus?
Superior part of the common tendinous ring (annulus of Zinn) at the orbital apex
What is the insertion of the Superior Rectus?
Superior sclera, ~7.5 mm posterior to the corneal limbus
What movements does the Superior Rectus produce?
Elevates, adducts, and intorts (medially rotates) the eyeball
What nerve supplies the Superior Rectus?
Superior division of the oculomotor nerve (CN III)
Is the Superior Rectus free to study in OIANS?
The Superior Rectus is always free to browse. Its full origin, insertion, action and nerve details are open to everyone in the Muscle Directory. Quiz and Flashcard practice for the Head & Neck is part of the one-time Lifetime upgrade, though; only the Upper Limb decks are free to test yourself on.
Related muscles
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