Superior oblique muscle

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Superior oblique
Recti muscles: 2 = superior, 3 = inferior, 4 = medial, 5 = lateral Oblique muscles: 6 = superior, 8 = inferior Other muscle: 9 = levator palpebrae superioris Other structures: 1 = Annulus of Zinn, 7 = Trochlea, 10 = Superior tarsus, 11 = Sclera, 12 = Optic nerve
Sagittal section of right orbital cavity
Details
Origin	Sphenoid bone at the orbital apex, medial to optic canal
Insertion	Outer posterior quadrant of the eyeball
Artery	Lateral muscular branch of the ophthalmic artery
Nerve	Trochlear nerve
Actions	Primary action is intorsion (medial rotation); secondary actions are to abduct and depress the eyeball (i.e. it makes the eye move outward and downward)
Identifiers
Latin	musculus obliquus superior bulbi
TA98	A15.2.07.016
TA2	2048
FMA	49039
Anatomical terms of muscle [edit on Wikidata]

The superior oblique muscle or obliquus oculi superior is a fusiform muscle originating in the upper, medial side of the orbit (i.e. from beside the nose) which abducts, depresses and internally rotates the eye. It is the only extraocular muscle innervated by the trochlear nerve (the fourth cranial nerve).