QS Study

The nasal septum is the median osteocartilaginous partition between the two halves of the nasal cavity. It is the thin wall of bone and cartilage that separates the right and left nostrils.

Formation

(A) The bony part is formed by –

  1. The vomer.
  2. The perpendicular plate of the ethmoid.
  3. Some contributions from the nasal spine of the frontal, the rostrum of the sphenoid and the nasal crest of the nasal, palatine and maxillary bones.

(B) The Cartilaginous part is formed by –

  1. The septal cartilage.
  2. The septal process of the inferior nasal cartilages.

(C) The cuticular part: is formed by fibrofatty tissue covered by skin.

nasal septum blood supply 1

Fig: Nasal Septum – Blood Supply

Blood Supply:

Arterial supply:

(A) Anterosuperior part: By –

  • Anterior ethmoidal artery and
  • The superior labial branch of the facial artery.

(B) Posteroinferior part: By the sphenopalatine artery. (The anteroinferior part contains anastomosis, known as Little’s area which is a common site for epistaxis).

Venous Drainage: The veins form a plexus which drains anteriorly into the facial vein and posteriorly through the sphenopalatine vein to the pterygoid venous plexus.

Nerve supply

(1) General sensory:

  1. The anterosuperior part of the septum is supplied by the internal nasal branch of the anterior ethmoidal nerve.
  2. The posteroinferior part is supplied by the nasopalatine branch of the pterygopalatine ganglion. All of these nerves arise from the trigeminal nerve.

(2) Special sensory (olfactory) nerves are confined to the upper part (Olfactory area).

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