5 Questions
What are the parts of the lacrimal apparatus?
The parts of the lacrimal apparatus are: 1. Lacrimal gland and its ducts, 2. Conjunctival sac, 3. Lacrimal puncta and lacrimal canaliculi, 4. Lacrimal sac, 5. Nasolacrimal duct.
What is the structure of the lacrimal gland?
The lacrimal gland is J-shaped, divided into orbital and conjunctival parts by the tendon of levator palpabrae superioris. The orbital part is situated in the lacrimal fossa in the anterolateral part of the roof of the bony orbit, and the palpebral part is situated in the lateral 1/3 of the upper eyelid.
How many lacrimal ducts are there and where do they open?
There are about 12 lacrimal ducts, 4-5 from the orbital part and 6-8 from the palpebral part. They open into the conjunctival sac of the superior fornix.
What happens when the palpebral part of the lacrimal gland is removed?
The ducts of the orbital part also pass through the palpebral part, so the removal of the palpebral part is equivalent to the removal of the gland.
Are there any accessory lacrimal glands?
Yes, there are accessory lacrimal glands.
Study Notes
Lacrimal Apparatus
- The lacrimal apparatus consists of parts responsible for secretion and drainage of lacrimal fluid, including the lacrimal gland, conjunctival sac, lacrimal puncta, lacrimal canaliculi, lacrimal sac, and nasolacrimal duct.
Lacrimal Gland
- The lacrimal gland is a serous gland, J-shaped, and divided into two parts by the tendon of levator palpebrae superioris.
- The orbital part is larger, deeper, and situated in the lacrimal fossa in the anterolateral part of the roof of the bony orbit.
- The palpebral part is smaller, superficial, and situated in the lateral 1/3 of the upper eyelid.
Lacrimal Ducts
- There are approximately 12 lacrimal ducts, with 4-5 from the orbital part and 6-8 from the palpebral part.
- The ducts pierce the conjunctiva of the upper eyelid and open into the conjunctival sac of the superior fornix.
- Ducts from the orbital part pass through the palpebral part, so removing the palpebral part is equivalent to removing the gland.
Accessory Lacrimal Glands
- Accessory lacrimal glands are present, but their details are not specified in the given text.
Test your knowledge of the lacrimal apparatus with this quiz! Identify the different parts involved in the secretion and drainage of lacrimal fluid, including the lacrimal gland, conjunctival sac, lacrimal puncta, lacrimal canaliculi, lacrimal sac, and nasolacrimal duct.
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