QS Study

The lateral wall of the nose is partly bony and partly cartilaginous and small amount of soft tissue. It is a region of the nasopharynx essential for humidifying and filtering the air we breathe in nasally. It is the medial wall of the maxillary sinus.

Blood supply

Arterial supply:

  1. The anterosuperior quadrant is supplied by the anterior ethmoidal artery assisted by the posterior ethmoidal and facial artery.
  2. The anteroinferior quadrant is supplied by branches from the facial and greater palatine arteries.
  3. The posterosuperior quadrant is supplied by the sphenopalatine artery.
  4. The posteroinferior quadrant is supplied by branches from the greater palatine artery which pierce the perpendicular plate of the palatine bone.

Venous drainage:

The veins form a plexus with which drains anteriorly into the facial vein. Posteriorly, into the pharyngeal plexus of the vein and from the middle part to the pterygoid plexus of veins. The veins draining the nasal cavity create plexus below the mucosa and in general follow the arteries. The veins of the nasal cavity drain into the facial vein, pterygoid venous plexus, and pharyngeal venous plexus.

The submucous venous plexus is more marked in the region of little’s area.

Blood Supply of Lateral Wall of Nose 1

Fig: Blood Supply and Nerve supply of Lateral Wall of Nose

Nerve Supply

(1) General sensory:

Nerves derived from the trigeminal nerve are distributed to the whole lateral wall.

  • The anterosuperior quadrant is supplied by the anterior ethmoidal nerve (a branch of ophthalmic nerve).
  • The anteroinferior quadrant is supplied by the anterosuperior alveolar nerve (a branch of maxillary nerve).
  • The posterosuperior quadrant is supplied by the posterior superior lateral nasal branches from the pterygopalatine ganglion (maxillary nerve).
  • The posteroinferior quadrant is supplied by the anterior palatine branch from the pterygopalatine ganglion (maxillary nerve).

(2) Special sensory:

Olfactory nerves are distributed to the upper part of the lateral wall just below the cribriform palate of the ethmoid up to superior concha.

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