Lateral nasal wall

Lateral nasal wall


LATERAL NASAL WALL    

  • Has 3 bony projections called as turbinates or conchae.
  • Irregular due to pressence of 3 conchae.
  • Seperates the nose from:
  1. Above orbit
  2. Below maxillary sinus
  3. Front Lacrimal groove & naolacrimal canal

Subdivided into:

  1. Vestibule small depressed area in ant. 
  2. Atrium of middle meatus in middle
  3. Posterior contains conchae

Bony part:

  1. Nasal
  2. Frontal process of maxilla
  3. Lacrimal
  4. Labryinth of ethmoid with superior & middle conchhae
  5. Inferior conchae
  6. Palatine bone (perpendicular plate, Orbital & sphenoidal process)
  7. Medial pterygoid Plate

Cartilagenous part:

  1. Superior nasal 
  2. Inferior nasal
  3. 3 to 4 from ala
 

CONCHAE/ TURBINATES:

  • Curved paired bony projection directed downward & medially:
  1. Inferior conchae (Largest): Independant bone.
  2. Middle conchae:  projects from medial surface of ethmoidal labyrinth
  3. Superior conchae (smallest): projects from medial surface of ethmoidal labyrinth.
→ Inferior turbinate is a maxilloturbinate because it is part of maxillary bone.

→ The inferior turbinate is a separate bone, while rest of the turbinates are a part of ethmoidal bone.

→ Sometimes fourth turbinate is also present just above superior turbinate known as Supreme turbinate.

→ The middle , superior & supreme turbinates are part of erhmoidal complex, they may be called as “ethmoidal turbinates”. 

 → Atrium is a shallow depression in front of the middle turbinate.

→ Agger nasi is an elevation just anterior to the attachment of middle turbinate.

 

MEATUS:

  • Passage beneath overlying conchae
  • Communicates with nasal cavity proper

1. Inferior meatus (largest): Under inferior conchae

  • Give opening to nasolacrimal duct (at junction of ant.1/3 & post. 2/3) guarded by Hasner’s valve or lacrimal fold.

2. Middle meatus: Under middle conchae.

Structures present in it: 

  1. Ethmoidal bulla: round elevation produced by underlying ethmoidal sinus. Gives opening to middle ethmoidal air sinus.
  2. Hiatus semilunaris: semicircular sulcus below bulla. Gives opening to:
  • Ant.: frontal air sinus
  • Post. maxillary sinus(2 openings)
  • Anterior ethmoidal sinus
  1. Infundibulum: Passage at ant. end of hiatus
  2. Uncinate process of ethmoid: It partly covers the opening of maxillary sinus.

3. Superior meatus (shortest & shallowest): under superior conchae.                                                         

  • Recives opening of posterior ethmoidal air sinus.

4. Sphenoethmoidal Recess:

  • Triangular Fossa above superior conchae that recieves opening of sphenoidal air sinus.

BLOOD SUPPLY:

ARTERIAL SUPPLY:

  • Anterosuperior: Anterior ethmoidal , posterior ethmoidal & facial arteries
  • Anteroinferior: Facial & greater palatine
  • Posterosuperior: Sphenopalatine
  • Posteroinferior: Greater palatine

VENOUS DRAINAGE:

  • Forms a venous plexus that drains
  • Ant. Facial vein
  • Post. Pharyngeal plexus of vein
  • Middle: Pterygoid plexus of vein

NERVE SUPPLY:

  1. General sensory:

  1. Anterosuperior: Anterior ethmoidal of opthalmic nerve
  2. Anteroinferior:  Anterior superior alveolar of maxillary nerve
  3. Posterosuperior: Posterior superior lateral nasal from pterygopalatine gangalion
  4. Posteroinferior:Ant. or greater palatine from pterygopalatine ganglion

  2. Special sensory:

  • Olfactory from upper part below cribriform plate of ethmoid to superior concha

LYMPHATIC DRAINAGE:

  • Anterior half: Submandibular nodes
  • Posterior half: Retropharyngeal & upper deep cervical nodes

Exam Question

LATERAL NASAL WALL 

CONCHAE/ TURBINATES:

  •  Curved paired bony projection directed downward & medially:
  1. Inferior conchae (Largest): Independant bone.
  2. Middle conchae:  projects from medial surface of ethmoidal labyrinth
  3. Superior conchae (smallest): projects from medial surface of ethmoidal labyrinth.
→ Inferior turbinate is a maxilloturbinate because it is part of maxillary bone.

→ The inferior turbinate is a separate bone, while rest of the turbinates are a part of ethmoidal bone.

→ Sometimes fourth turbinate is also present just above superior turbinate known as Supreme turbinate.

→ The middle , superior & supreme turbinates are part of erhmoidal complex, they may be called as “ethmoidal turbinates”. 

MEATUS:

  • Passage beneath overlying conchae
  • Communicates with nasal cavity proper

1. Inferior meatus (largest): Under inferior conchae

  • Give opening to nasolacrimal duct (at junction of ant.1/3 & post. 2/3) guarded by Hasner’s valve or lacrimal fold.

2. Middle meatus: Under middle conchae.

Structures present in it: 

  1. Ethmoidal bulla: round elevation produced by underlying ethmoidal sinus. Gives opening to middle ethmoidal air sinus.
  2. Hiatus semilunaris: semicircular sulcus below bulla. Gives opening to:
  • Ant.: frontal air sinus
  • Post. maxillary sinus(2 openings)
  • Anterior ethmoidal sinus 
  1. Infundibulum: Passage at ant. end of hiatus
  2. Uncinate process of ethmoid: It partly covers the opening of maxillary sinus.

 → Atrium is a shallow depression in front of the middle turbinate.

→ Agger nasi is an elevation just anterior to the attachment of middle turbinate.
 

3. Superior meatus (shortest & shallowest): under superior conchae.

  •  Recives opening of posterior ethmoidal air sinus. 

4. Sphenoethmoidal Recess:

  • Triangular Fossa above superior conchae that recieves opening of sphenoidal air sinus.
Don’t Forget to Solve all the previous Year Question asked on Lateral nasal wall

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