Nasal Bone Flashcards

Examine the nasal bones, including their surfaces, borders, articulations, muscle attachments, ossification, and clinical landmarks.

Card 1 of 22Question

What are the nasal bones?

A pair of small, rectangular facial bones that form the bony bridge of the nose.

In This Section

1. What are the nasal bones?

A pair of small, rectangular facial bones that form the bony bridge of the nose.

2. Where are the nasal bones located?

In the superior midline region of the external nose, inferior to the frontal bone.

3. What are the two surfaces of each nasal bone?

An external convex surface and an internal concave surface.

4. What are the four borders of each nasal bone?

The superior, inferior, medial, and lateral borders.

5. Which bone articulates with the superior border of the nasal bone?

The frontal bone.

6. Which bone articulates with the lateral border of the nasal bone?

The frontal process of the maxilla.

7. Which structure articulates with the medial border of each nasal bone?

The opposite nasal bone.

8. Which bone supports the nasal bones posteriorly near their midline junction?

The perpendicular plate of the ethmoid bone.

9. What is the internasal suture?

The fibrous joint connecting the medial borders of the right and left nasal bones.

10. What is the frontonasal suture?

The fibrous joint between the superior borders of the nasal bones and the frontal bone.

11. What is the nasion?

The midline craniometric landmark at the intersection of the frontonasal and internasal sutures.

12. What is the relationship of the inferior border of the nasal bones to the nasal cartilages?

It attaches to the lateral nasal cartilages, contributing to the transition from the bony to cartilaginous nose.

13. Which part of the nasal bones is generally thicker?

The superior portion, near its articulation with the frontal bone.

14. Which facial muscle has an attachment near the superior lateral region of the nasal bone?

The procerus muscle.

15. Which structures are associated with the small foramina on the nasal bone?

Small blood vessels passing through the bone.

16. Which artery contributes to the blood supply of the external nasal bone region?

The dorsal nasal artery, a branch of the ophthalmic artery.

17. Which nerve provides cutaneous sensation over much of the nasal bridge?

The infratrochlear nerve, a branch of the nasociliary nerve from the ophthalmic division (V1).

18. Which part of the nasal cavity is supported by the internal surfaces of the nasal bones?

The anterior superior portion of the nasal cavity, including part of its bony roof.

19. How do the nasal bones primarily develop embryologically?

Through intramembranous ossification of mesenchymal tissue.

20. Why are the nasal bones especially susceptible to facial fractures?

Their prominent position and relatively thin inferior portions make them vulnerable to direct trauma.

21. Which adjacent structure may be injured in a displaced nasal bone fracture, causing a septal hematoma?

The nasal septum, particularly its cartilage and overlying perichondrium.

22. What is the anatomical significance of a naso-orbito-ethmoid fracture?

It involves the central midface around the nasal bones, medial orbital walls, and ethmoid region.