Lacrimal Apparatus

Question 1

Lacrimal apparatus is divided into: (4)

Answer 1

1. Lacrimal gland
2. Lacrimal canaliculi
3. Lacrimal sac
4. Nasolacrimal duct

Question 2

Parts of lacrimal gland (2)

Answer 2

1. Large orbital part lying in lacrimal fossa (anterolateral part of orbital roof) above Levator palpebrae superioris muscle
2. Small palpebral part lying below the muscle

Question 3

Lacrimal glands short ducts number and site

Answer 3

1. 10-12 short ducts
2. Open in lateral part of superior conjunctival fornix

Question 4

Lacrimal gland innervation (2)

Answer 4

1. Greater superficial petrosal nerve (facial nerve)
2. Lacrimal nerve

Question 5

Greater superficial petrosal nerve relay and course

Answer 5

1. Relay in sphenopalatine ganglion
2. Postganglionic fibers join maxillary nerve
3. Pass in its zygomatic nerve
4. Then into zygomaticotemporal nerve
5. Then through a communicating ramus to lacrimal nerve which supplies the gland

Question 6

Lacrimal canaliculi site

Answer 6

1. Two canaliculi for each eyelid
2. Runs in corresponding eyelid edge
3. Extending from lacrimal puncture at the top of lacrimal papilla and draining tears into lacrimal sac

Question 7

Lacrimal sac site

Answer 7

Lacrimal groove in anterior part of orbit medial wall

Question 8

Upper blind end of lacrimal sac

Answer 8

Fundus

Question 9

Lower end of lacrimal sac

Answer 9

Continuous with nasolacrimal duct

Question 10

Nasolacrimal duct course

Answer 10

1. Starts from lacrimal sac
2. Passes downwards inside Nasolacrimal canal
3. Open at anterior part of inferior nasal meatus