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
3.
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
8.
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.