Dissection of left orbit from a lateral approach

Nerve supply to a superior rectus and levator palpebrae superioris muscles

For permissions information regarding the use of these images, please contact Drew Bourn at dbourn@stanford.edu

Image #56-3

Dissection of left orbit from a lateral approach Nerve supply to a superior rectus and levator palpebrae superioris muscles The muscles have been elevated. Branches of the superior division of the oculomotor nerve(16) enter the superior rectus muscle. Branches of the nerve also pass through the muscle or along its medial border to reach the inferior surface of the levator palpebrae superioris muscle(12). 1 . Supraorbital nerve 2 . Branches of oculomotor nerve (III) entering levator palpebrae superioris muscle 3 . Upper pointer: Superior rectus muscle Lower pointer: Fascia extending between borders of superior and lateral rectus muscles 4 . Sheath of optic nerve 5 . Posterior ciliary arteries (long and short) 6 . Insertion of inferior oblique muscle 7 . Insertion of lateral rectus muscle 8 . Short ciliary nerves 9 . Inferior rectus muscle 10 . Branch of oculomotor nerve to inferior oblique muscle 11 . Mucoperiosteum of maxillary sinus 12 . Levator palpebrae superioris muscle 13 . Olfactory tracts 14 . Upper pointer: Optic nerve (ll) Lower pointer: Sheath of optic nerve (in optic canal) 15 . Trochlear nerve (IV) 16 . Upper pointer: Superior branch oculomotor nerve (III) Lower pointer: Inferior branch oculomotor nerve (llI) 17 . Upper pointer: Frontal nerve Lower pointer: Lacrimal nerve (cut off) 18 . Upper pointer: Nasociliary nerve Lower pointer: Abducens nerve (cut off) 19 . Right pointer: Common annular tendon (divided) Left pointer: Ophthalmic artery 20 . Ciliary ganglion 21 . Muscular branch of ophthalmic artery 22 . Maxillary nerve 23 . Sphenopalatine ganglion 24 . Infraorbital sulcus