The nasal septum is the median partition that divides the nasal cavity into two sides. It has bony, cartilaginous, and membranous components. The bony parts include the perpendicular plate of the ethmoid and the vomer. The cartilaginous parts include the septal cartilage and the medial crura of the alar cartilages, which join to form the columella. The membranous septum lies inferior to the septal cartilage. The nasal septum receives its blood supply from branches of the ophthalmic and maxillary arteries and its innervation from branches of the anterior ethmoidal, nasociliary, pterygopalatine, and maxillary nerves.

1. MEDIAN NASAL SEPTUM
V.S.RASHMI PRIYEM

2. MEDIAL WALL OF NASAL CAVITY
 THE NASAL SEPTUM IS A MEDIAN
OSSEOCARTILAGINOUS PARTITION BETWEEN
THE TWO NASAL CAVITIES.
 SELDOM EXACTLY IN THE MEDIAN PLANE BUT
BULGES TO ONE OR THE OTHER SIDE, MORE
FREQUENTLY TO THE RIGHT.
 THE BONY PART IS FORMED BY :
 (A) PERPENDICULAR PLATE OF ETHMOID, WHICH
FORMS THE POSTEROSUPERIOR PART OF THE
SEPTUM
 (B) VOMER, WHICH FORMS THE
POSTEROINFERIOR PART OF THE SEPTUM

4. CARTILAGINOUS SEPTUM
 THE CARTILAGINOUS PART IS FORMED BY :
 (A) SEPTAL CARTILAGE, FITS IN THE ANGLE
BETWEEN THE VOMER AND PERPENDICULAR
PLATE OF ETHMOID
 (B) SEPTAL PROCESSES OF THE TWO MAJOR
ALAR CARTILAGES.

5. COLUMELLA
 THE SEPTAL PROCESSES (MEDIAL CRURA) OF
TWO MAJOR ALAR CARTILAGES ARE UNITED
TOGETHER IN THE MIDLINE
 BY A FIBROUS TISSUE TO FORM COLUMELLA
 ALSO CALLED COLUMELLAR SEPTUM

6. MEMBRANOUS SEPTUM
 BETWEEN THE COLUMELLA AND CAUDAL
BORDER OF THE SEPTAL CARTILAGE.
 A SMALL PORTION OF SEPTUM IS MADE UP OF
DOUBLE LAYER OF THE SKIN .
 WITH NO BONY OR CARTILAGINOUS SUPPORT.
 THIS PART IS REFERRED TO AS MEMBRANOUS
SEPTUM.
 BOTH COLUMELLAR AND MEMBRANOUS
PARTS ARE FREELY MOVABLE FROM SIDE-TO-
SIDE.

7. ARTERIAL SUPPLY OF NASAL SEPTUM
 1. SEPTAL BRANCH OF THE ANTERIOR ETHMOIDAL
ARTERY
 A BRANCH OF OPHTHALMIC ARTERY
 2. SEPTAL BRANCH OF THE POSTERIOR
ETHMOIDAL ARTERY
 A BRANCH OF OPHTHALMIC ARTERY
 3. SEPTAL BRANCH OF THE SPHENOPALATINE
ARTERY
 A BRANCH OF MAXILLARY ARTERY
 4. SEPTAL BRANCH OF THE GREATER PALATINE
ARTERY
 A BRANCH OF MAXILLARY ARTERY
 5. SEPTAL BRANCH OF THE SUPERIOR LABIAL
ARTERY
 A BRANCH OF FACIAL ARTERY

9. NERVE SUPPLY OF NASAL SEPTUM
 1. OLFACTORY NERVES
 SUPPLY THE UPPER PART JUST BELOW THE CRIBRIFORM
PLATE.
 2. INTERNAL NASAL BRANCH OF ANTERIOR ETHMOIDAL
NERVE, A BRANCH FROM NASOCILIARY
 SUPPLIES THE ANTEROSUPERIOR PART.
 3. NASOPALATINE NERVE, A BRANCH OF
PTERYGOPALATINE GANGLION
 SUPPLIES THE POSTEROINFERIOR PART.
 4. MEDIAL POSTERIOR SUPERIOR NASAL BRANCHES OF
PTERYGOPALATINE GANGLION
 SUPPLY THE POSTEROSUPERIOR PART.
 5. NASAL BRANCH OF GREATER PALATINE NERVE
 SUPPLIES THE POSTERIOR PART.
 6. ANTERIOR SUPERIOR ALVEOLAR NERVE, A BRANCH
OF MAXILLARY NERVE
 SUPPLIES THE ANTEROINFERIOR PART.