"The nasal septum (Latin: septum nasi) separates the left and right nasal cavities. It extends from the nares anteriorly to the choanae posteriorly and is covered by squamous epithelium."
"The vertical midline nasal septum is comprised primarily of a single nasal cartilage from the external nose and two bones. Anteriorly the septal cartilage (quadrangular cartilage) approximates a quadrilateral shape. Posteriorly it meets the concave anterior margins of the ethmoid and vomer. Superoposteriorly is the perpendicular plate of the ethmoid, inferoposteriorly is the vomer; these two bones have a diagonal articulation running in a superoposteriorly-anteroinferiorly direction. Occasionally the nasal septal cartilage extends more posteriorly interposing itself between the ethmoid and vomer which in some cases never meet 1."
"The greater alar cartilages which form part of the cartilaginous scaffolding of the external nose each have two crura, lateral and medial. The two medial crura are tenuously joined in the midline and together with some intervening soft tissue form the septum mobile nasi at the most anteroinferior margin of the septal cartilage. Anteriorly, the columella is the visible soft tissue portion of the nasal septum that separates the two nares (nostrils) and incorporates the septum mobile nasi."