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Dissection of left orbit from an anterior approach

Relation of orbital septum to aponeurotic and smooth muscle insertions of levator palpebrae superioris muscle

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Image #53-1
Diagram Image
Legend Image
Dissection of left orbit from an anterior approach
Relation of orbital septum to aponeurotic and smooth muscle insertions of levator palpebrae superioris muscle
The aponeurosis of the levator palpebrae superioris muscle has been cut back so that the entire extent of the tarsal muscle is visible. Smooth muscle fibers are less evident in the extreme lateral and medial parts of this layer. The orbital septum does not appear to be a complete membrane in the lateral and inferior parts of the orbit, but rather consists of fibrous bands intermingled with lobules of fat. The layer of connective tissue which extended betweeen the orbicularis oculi muscle and the orbital septum has been completely removed.
  1. Supraorbital nerve, artery, and vein
  2. Remnant of origin of corrugator supercilli muscle
  3. Orbital septum (detached from aponeurosis of levator palpebrae muscle)
  4. Supratrochlear nerve
  5. Upper pointer: Position of trochlea Lower pointer: Infratrochlear nerve
  6. Nasofrontal vein emerging from orbit
  7. Area of origin of upper part of orbicularis oculi muscle
  8. Middle palpebral artery
  9. Superior canaliculus
  10. Medial palpebral ligament
  11. Nasal bone
  12. Fibers of orbicularis oculi muscle (cut across near origin)
  13. Nasomaxillary suture
  14. Frontal process of maxilla
  15. Small artery along periosteum
  16. Zygomaticomaxillary suture
  17. Supraorbital margin of orbit
  18. Fascia of levator palpebrae superioris muscle
  19. Aponeurosis of Ievator palpebrae superioris muscle
  20. Zygomatic process frontal bone
  21. Superior tarsalis muscle (muscle of Müller)
  22. Superior tarsus and tarsal (Meibomian) glands
  23. Lateral palpebral artery
  24. Inferior tarsus
  25. Orbital branch (aberrant) from external maxillary artery
  26. Orbital septum
  27. Zygomatico-facial branch of zygomatic nerve
  28. Zygomatic bone