Dissection of left orbit from a lateral approach

Nerve supply to a superior rectus and levator palpebrae superioris muscles

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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