Lateral Wall of Nose

Anatomy - Lateral Wall of Nose

1. Lateral Wall of Nose V.S.Rashmi Priyem ULTRA’S BEST Dental Science College

2. The Lateral Wall of the Nose is complicated It is formed by a Number of Bones and Cartilages

3. Bones forming the Lateral Wall are: (a) Nasal Bone (b) Frontal Process of Maxilla (c) Lacrimal Bone (d) Conchae and Labyrinth of Ethmoid (e) Inferior Nasal Concha (f) Perpendicular Plate of Palatine (g) Medial Pterygoid Plate of Sphenoid

4. C artilages forming the Lateral W all are: (a) Lateral Nasal Cartilage (Upper Nasal Cartilage) (b) Major Alar Cartilage (Lower Nasal Cartilage) (c) Three To Four Tiny Cartilages of the Alae (Minor Alar Cartilages)

5. Features The Lateral Wall is divided into the following Three Areas: 1. Anterior Part Small Depressed Area, the Vestibule lined by the Skin containing Vibrissae (Short, Stiff Curved Hair) 2. Middle part known as Atrium of the Middle Meatus limited above by a Faint Ridge of Mucous Membrane, the Agger nasi Curved Mucocutaneous Junction between the Atrium and Vestibule is known as Limen nasi . 3. Posterior part Three Scroll-like Projections, the Conchae or Turbinates The Spaces Separating the Conchae are called Meatuses .

6. The Conchae and Meatuses Conchae (also called turbinates ) are the curved bony projections directed downwards and medially. Below and lateral to each concha is a corresponding meatus . From above downwards the conchae are superior, middle, and inferior nasal conchae . Sometimes a 4th concha , the concha suprema is also present.

7. Conchae : 1. Superior and Middle N asal Conchae are the Projections from the medial surface of the E thmoidal Labyrinth. 2. Inferior C oncha is an Independent Bone. 3. The Superior C oncha is Smallest and I nferior concha is Largest in size.

8. Meatuses : Meatuses are the Passages (Recesses) beneath the Overhanging Conchae 1. Inferior Meatus is the Largest and Lies Underneath the Inferior Nasal Concha . 2. Middle Meatus Lies Underneath the Middle Concha . It presents following features: (a) Ethmoidal bulla (bulla ethmoidalis ), a Round Elevation produced by the underlying Middle Ethmoidal Sinuses. (b) Hiatus semilunaris , a Deep Semicircular Sulcus below the Bulla ethmoidalis . (c) Infundibulum , a Short Passage at the Anterior End Of Middle Meatus . 3. Superior meatus is the Smallest and lies Below the Superior Concha .

9. Ethmoidal bulla

10. Hiatus semilunaris

11. A Triangular D epression , Above and Behind the Superior C oncha is known as the Sphenoethmoidal Recess.

12. Openings The Lateral Wall of the Nose has Number of Openings.