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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