innervated by innervated_by has muscle origin has muscle origin has muscle insertion has muscle insertion Homo sapiens trochlear nerve superior oblique extraocular muscle http://upload.wikimedia.org/wikipedia/commons/e/e8/Eyemuscles.png dorsal oblique extraocular muscle M. obliquus superior UMLS:C0582816 FMA:49039 dorsal oblique extraocular muscles The superior oblique muscle, or obliquus oculi superior, is a fusiform muscle in the upper, medial side of the orbit whose primary action is downward, lateral rotation of the eye. One of the extraocular muscles, the superior oblique is the only muscle innervated by the trochlear nerve (the fourth cranial nerve). NCIT:C33688 Wikipedia:Superior_oblique_muscle Cranial nerve IV innervated; dorsal in the obliquus group.[AAO] superior oblique musculus obliquus superior bulbi UBERON:0006321 AAO:0010119 musculus obliquus superior The ability to rotate the eyeball is common to all vertebrates with well-developed eyes, regardless of the habitat in which they live, so these [extrinsic ocular] muscles tend to be conservative. They change little during the course of evolution.[well established][VHOG] SCTID:181155005 obliquus oculi superior superior oblique muscle obliquus superior ZFA:0000738 MA:0001277 TAO:0000738 VHOG:0001131 oblique extraocular muscle eyeball of camera-type eye common tendinous ring