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Lane Medical Library

Bassett Collection of Stereoscopic Images of Human Anatomy

Dissection of left orbit from an anterior approach

Lacrimal sac and nasolacrimal duct opened

Image #53-6

KEYWORDS: Eye, Face, Muscles and tendons.

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Dissection of left orbit from an anterior approach
Lacrimal sac and nasolacrimal duct opened
Valve-like mucosal folds (15) are visible in the nasolacrimal duct. The one which guards the opening of the duct into the inferior nasal meatus (valve of Hasner, 17) extends about 5 mm. below the opening of the bony nasolacrimal canal (16). The tendon of the superior oblique muscle has been exposed within the trochlea (4) and its relation to the insertion of the levator palpebrae superioris muscle displayed.
  1. Dura mater
  2. Supraorbital nerve and vein
  3. Supratrochlear nerve
  4. Tendon of superior oblique muscle
  5. Infratrochlear nerve and dorsal nasal artery
  6. Nasal bone
  7. Middle palpebral artery (inferior)
  8. Fornix lacrimal sac
  9. Frontal process of maxilla
  10. Site of entry of lacrimal canaliculi into lacrimal sac (sinus of Maier)
  11. Lacrimal sac (opened)
  12. Infraorbital margin
  13. Nasolacrimal duct (opened; upper pointer, cavity; lower pointer, outer surface)
  14. Middle nasal concha and middle nasal meatus
  15. Mucosal folds within nasolacrimal duct
  16. Inferior nasal concha (cut across to illustrate bony wall of nasolacrimal canal)
  17. Left pointer: Lacrimal folds Right pointer: Opening of nasolacrimal duct
  18. Mucosa of Inferior nasal concha (note venous plexus)
  19. Inferior nasal meatus
  20. Nasal septum
  21. Superior tarsalis muscle
  22. Superior tarsus
  23. Lacrimal puncta and ampulla of superior lacrimal duct
  24. Inferior Iacrimal punctum
  25. Medial ocular angle
  26. Inferior lacrimal duct
  27. Inferior conjunctival fornix
  28. Inferior oblique muscle
  29. Periosteal lining of nasolacrirnal canal
  30. Infraorbital foramen
  31. Superior anterior alveolar artery