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Dissection of left orbit from a lateral approach

Relation of muscle fascia to Tenon's capsule; insertion of lateral rectus and inferior oblique muscles

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Image #56-2
Diagram Image
Legend Image
Dissection of left orbit from a lateral approach
Relation of muscle fascia to Tenon's capsule; insertion of lateral rectus and inferior oblique muscles
The bone of the orbital margin has been resected and the fascia which covered the insertion of the lateral rectus and inferior oblique muscles cut and reflected. The continuity of the muscle fascia with the bulbar fascia (Tenon's capsule) is visible. The lacrimal gland has been cut away except for a few lobules of its inferior portion. THe lateral expansion of the aponeurosis of the levator palpebrae superioris muscle crosses this area(4). A few muscle fibres from this muscle appear to end in a the fascia related to the lacrimal gland (4, upper pointer).
  1. Falx cerebri
  2. Levator palpebrae superioris muscle
  3. Supraorbital nerve and artery
  4. Upper pointer: Inferior lacrimal gland Lower pointer: Lateral horn of aponeurosis of levator palpebrae superioris muscle
  5. Area of blending of fascia of lateral rectus muscle with that of the bulh
  6. Supraorbital margin
  7. Tunica conjunctiva bulbar
  8. Sclera
  9. Insertion of lateral rectus muscle
  10. Lateral rectus muscle
  11. Tunica conjunctiva bulbar (elevated together with anterior extension of bulbar fascia)
  12. Inferior oblique muscle and related fascia
  13. Artery and nerve to inferior oblique muscle
  14. Orbital branch of infraorbital artery
  15. Infraorbital nerve within infraorbital canal (cut open)
  16. Upper pointer: Superior anterior alveolar nerve Lower pointer: Mucoperiosteum of maxillary sinus
  17. Superior ophthalmic vein
  18. Upper pointer: Superior rectus muscle Lower pointer: Ophthalmic artery
  19. Frontal nerve
  20. Sheath of optic nerve (optic canal opened)
  21. Upper pointer: Branch of oculomotor nerve (III) to superior rectus muscle Lower pointer: Nasociliary nerve
  22. Common annular tendon (cut open to show contents of "oculomotor foramen")
  23. Abducens nerve (VI) entering lateral rectus muscle
  24. Ciliary ganglion
  25. Short ciliary nerves (no distinct long ciliary branches of nasociliary nerve were present)
  26. Posterior ciliary artery (long)
  27. Sheath of optic nerve
  28. Inferior rectus muscle
  29. Sphenoid sinus and sphenopalatine ganglion
  30. Artery of pterygoid canal
  31. Infraorbital artery (cut off)