Anatomy of external nose by av sharma

for mbbs students

1. Development of nose Roll no 1305 ANATOMY OF EXTERNAL NOSE a v sharma Roll no 1305

2. The Nose The nose consists of the external nose and the nasal cavity , Both are divided by a septum into right and left halves.

3. EXTERNAL NOSE Pyramidal shaped, with its root up and the base directed down It has osteocartilaginous framework covered by muscles and skin

4. External Nose The external nose has two elliptical orifices called the naris (nostrils) , which are separated from each other by the nasal septum . The lateral margin, the ala nasi , is rounded and mobile.

5. External Nose

6. OSTEOCARTILAGINOUS FRAMEWORK Upper one third is bony Lower two third is cartilaginous

7. BONY PART The framework of the external nose is made up above by the nasal bones , the frontal processes of the maxillae , and the nasal part of the frontal bone .

8. CARTILAGENOUS PART

9. UPPER LATERAL CARTILAGE situated below the inferior margin of the nasal bone, and is flattened, and triangular in shape superior margin is attached to the nasal bone and the frontal process of the  maxilla ; its inferior margin is connected by fibrous tissue with the  greater alar cartilage .

10. G reater alar cartilage  ( lower lateral cartilage ) is a thin, flexible plate, situated immediately below the  lateral nasal cartilage , and bent upon itself in such a manner as to form the  medial wall  and  lateral wall  of the  naris  of its own side.

11. LESSER ALAR CARTILAGE the part of the nose which forms the lateral wall is curved to correspond with the ala of the  nose ; it is oval and flattened, narrow behind, where it is connected with the frontal process of the  maxilla  by a tough fibrous membrane

12.  Septal nasal cartilage continuous with the anterior margins of the  lateral cartilages ; below, it is connected to the medial crura of the  greater alar cartilages  by fibrous tissue. Its posterior margin is connected with the perpendicular plate of the  ethmoid ; its inferior margin with the vomer and the  palatine processes  of the  maxillae .

13. NASAL MUSCULATURE

14. VARIOUS MUSCLES GROUPS,, the elevator muscle group  —   procerus muscle  and the  levator labii superioris alaeque nasi muscle . the depressor muscle group  — alar nasalis muscle  and the  depressor septi nasi muscle . the compressor muscle group  — transverse  nasalis muscle . the dilator muscle group  — dilator naris muscle  that expands the nostrils; it is in two parts:anterior and posterior

15. Blood Supply of the External Nose The skin of the external nose is supplied by branches of the ophthalmic and the maxillary arteries. The skin of the ala and the lower part of the septum are supplied by branches from the facial artery.

16. Nerve Supply of the External Nose The infratrochlear and external nasal branches of the ophthalmic nerve (CN V) and the infraorbital branch of the maxillary nerve (CN V).

17. THANK YOU