BONES OF NASAL CAVITY

Masyitah Mustaffa

Overview: Bones of the skull

Nasal Septum

1. Septal Cartilage2. Ethmoid bone3. Vomer

• A flat plate that descend from cribriform plate to form part of nasal septum

• Articulate with vomer inferiorly

Ethmoid Bone - Perpendicular plate

• Articulate with perpendicular plate of ethmoid, maxilla, palatine and sphenoid bone and septal cartilage

• Posterior border no articulation with other bone

Vomer

Base of Nasal Cavity1. Maxilla – Palatine Process of Maxilla2. Palatine Bone – Horizontal Plate of Palatal

Bone

• Extend medially to form the majority of hard palate

• Articulate with palatine process of opposite side and horizontal plate of palatine bone

• Present of incisive foramen

Maxilla - Palatine Process

• Form posterior portion of hard palate• Nasal cavity superiorly• On medial part, form by both horizontal

plate is posterior nasal spine• Has greater palatine foramina

Palatine bone – Horizontal Plate

Posterior Border of Nasal Cavity

Sphenoid Bone - Body

• The center of sphenoid bone• Anterior portion form part of nasal cavity• Contain sphenoid paranasal sinuses

Superior Border of Nasal Cavity

1. Nasal Bone2. Frontal Bone3. Ethmoid Bone

Nasal Bone

• Inferior portion form superior margin of nasal aperture• Inferior portion of nasal bone attach with lateral nasal cartilage and septal cartilage

Frontal Bone – Nasal Portion

• Articulate with nasal bone and frontal process of maxilla to form root of nose

Ethmoid Bone - Cribriform Plate

• A horizontal bone that form superior surface of ethmoid• Contain numerious foramina for olfactory nerves

Lateral Border of Nasal Cavity

1. Ethmoid Bone2. Lacrimal Bone3. Inferior Nasal Concha4. Palatine Plate

Ethmoid Bone – ethmoid labyrinth

• Largest part of ethmoid bone• Descend inferiorly from the cribriform plate• Ethmoid paranasal sinuses located within• Form 2 major structure within nasal cavity

• Superior nasal concha• Middle nasal concha

Lacrimal Bone

• Small and rectangular in shape• Inferior part of lacrimal form small portion of lateral wall of nasal cavity

Inferior Nasal Concha

• A curved bone that form part of lateral wall of nasal cavity• Articulate with maxilla and perpendicular plate of palatine, lacrimal, and ethmoid bone

Palatine Bone – Perpendicular plate

• Shape of vertical rectangle• Superior border is a notch articulate with sphenoid bone, form sphenopalatine

foramen• Form part of lateral wall of nasal cavity

Reference

• Netter’s Head and Neck Anatomy for Dentistry