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
- Anteriorly quadrilateral septal cartilage
- Medial crus of the alar cartilage
- 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
- Nasal crest of the maxilla
- Nasal crest palatine process
- Anterior nasal spine of maxilla
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.
- Sphenopalatine vein
- Anterior and posterior ethmoidal veins
- Anterior facial vein
- Cerebral veins
- Trigeminal nerve including anterior ethmoidal nerve.
- Sphenopalatines ganglion.