DocGuy Short Notes: Anatomy of the Nose & Paranasal Sinuses

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ANATOMY
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NOSE & PARANASAL SINUSES Bridge

Nose
Consists of external nose and nasal cavity, Skin is abundant in
sebaceous glands Dorsum
External nosebony & cartilage framework
Bones
 2 nasal bones
 frontal process of maxilla Tip
Cartilages
 lateral Processes of septal cartilages
Base
 major alar cartilages
 minor alar cartilages
 Alasolely of fatty tissue at its free lower border

Nasal cavityAnterior nares to posterior choanae
Communicate with nasopharynx
divided by medial nasal septum (medial wall)
Medial wall
  perpendicular plate of ethmoid bone 
 vomer bone 
 septal cartilage 
 Small contribution from maxillary bone and palatine
bone

Lateral wall
 frontal process of maxilla (mainly)
 perpendicular plate of the palatine bone
 medial pterygoid plate
 ethmoid labyrinth with superior and middle conchae
 inferior nasal conchae
 nasal bone
 lacrimal bone
 Cartilaginous part

Conchae and Meatus
Conchae
 curved bony projections directed downwards and
medially
1. Superior conchae Projections from
2. Middle conchae ethmoid bone
3. Inferior conchae – independent bone


Meatus
 Passages beneath the
overhanging conchae
 Paranasal sinuses
open into meatus
1. Superior meatusposterior ethmoidal air cells
2. Middle meatus● Ethmoidal bulla middle ethmoidal air cells
 hiatus semilunaris (A deep semicircular sulcus below bulla)Frontal sinus (anteriorly)
Anterior ethmoidal air cells (middle)
 Maxillary air sinus (posteriorly)
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