NOSE - Anatomy Nasal Septum

The nasal septum divides the nasal cavity into two halves.

The nasal septum has a:

  • Bony part
  • Cartilaginous part
  • Membranous part

Bony part: This is made up of:

  • Posterosuperiorly: The perpendicular plate of the ethmoid.
  • Posteroinferiorly: Vomer BONE

Cartilaginous part:

  • Anteriorly quadrilateral septal cartilage
  • Medial crus of the alar cartilage

Membranous part:

  • This is the anterior most part of the nasal septum lined by skin and fibrofatty tissue.

Articulation of the nasal septum:

  • Superiorly: Sphenoid Rostrum
  • Anteriorily: Nasal bones, nasal spine of frontal bones
  • Inferiorily:
    • Nasal crest of the maxilla
    • Nasal crest palatine process
    • Anterior nasal spine of maxilla

Blood Supply:

The blood supply of the septum:

Arterial is made up of:

  • Anterior Ethmoidal Artery
  • Superior Labial Artery
  • Sphenopalatine Artery
  • Greater palatine artery

The above four arteries form a plexus in the anterio–inferior portion of the nasal septum called the Kiesselboch's plexus or Little area.

Venous Drainage:

  • Sphenopalatine vein
  • Anterior and posterior ethmoidal veins
  • Anterior facial vein
  • Cerebral veins

Nerve supply:

  • Trigeminal nerve including anterior ethmoidal nerve.
  • Sphenopalatines ganglion.

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