Lacrimal Bone Flashcards

Examine the lacrimal bone's position in the medial orbital wall, bony landmarks, articulations, and relationship to the tear drainage system.

Card 1 of 23Question

Where is the lacrimal bone located?

In the anterior part of the medial wall of each orbit.

In This Section

1. Where is the lacrimal bone located?

In the anterior part of the medial wall of each orbit.

2. What type of bone is the lacrimal bone?

A small, thin, paired facial bone.

3. Which bone lies immediately posterior to the lacrimal bone in the medial orbital wall?

The ethmoid bone, specifically its orbital plate or lamina papyracea.

4. Which bone lies immediately anterior to the lacrimal bone?

The frontal process of the maxilla.

5. Which four bones articulate with the lacrimal bone?

The frontal, ethmoid, maxillary, and inferior nasal conchal bones.

6. What are the two surfaces of the lacrimal bone?

The lateral orbital surface and the medial nasal surface.

7. What is the posterior lacrimal crest?

A vertical ridge on the orbital surface of the lacrimal bone.

8. What is the lacrimal groove?

A vertical depression anterior to the posterior lacrimal crest that contributes to the lacrimal sac fossa.

9. Which bones form the lacrimal sac fossa?

The lacrimal bone and the frontal process of the maxilla.

10. Which structure occupies the lacrimal sac fossa?

The lacrimal sac.

11. What forms the anterior boundary of the lacrimal sac fossa?

The anterior lacrimal crest of the maxilla.

12. Which ligament attaches to the posterior lacrimal crest?

The posterior limb of the medial palpebral ligament.

13. Which muscle has attachments near the posterior lacrimal crest?

The lacrimal part of the orbicularis oculi muscle, also called Horner's muscle.

14. What is the lacrimal hamulus?

A small hook-shaped projection at the inferior end of the posterior lacrimal crest.

15. Which canal is partly formed by the lacrimal bone?

The nasolacrimal canal.

16. Which bones contribute to the walls of the nasolacrimal canal?

The maxilla, lacrimal bone, and inferior nasal concha.

17. Where does the nasolacrimal duct open?

Into the inferior nasal meatus, beneath the inferior nasal concha.

18. What is the role of the lacrimal bone in tear drainage?

It supports the lacrimal sac and contributes to the bony passage carrying tears toward the nasal cavity.

19. Which portion of the lacrimal bone contributes to the lateral wall of the nasal cavity?

Its medial surface.

20. How does the lacrimal bone primarily develop?

Through intramembranous ossification.

21. Why is the lacrimal bone vulnerable to fracture?

Its thin structure forms part of the delicate medial orbital wall.

22. What is dacryocystitis?

Inflammation or infection of the lacrimal sac, commonly associated with obstruction of the nasolacrimal drainage pathway.

23. What is the anatomical purpose of dacryocystorhinostomy?

To create a new drainage passage between the lacrimal sac and nasal cavity, bypassing an obstructed nasolacrimal duct.