NOSE AND PARANASAL sinuses PPT & diagrams

easy and detailed expalanation about nose and paranasal sinuses to learn,write in exams in presentable manner with diagrms made easy

1. NOSE AND PARANASAL SINUSES Dr. Akansha shrivastava MDS PG 1 st Year OMR DEPT.

2. THE NOSE

3. BLOOD SUPPLY AND NERVE SUPPLY OF EXTERNAL NOSE BLOOD SUPPLY- Ophthalmic Artery Maxillary Artery Facial Artery NERVE SUPPLY- External Nasal nerve Infratrochlear nerve Infraorbital nerve

4. The Roof of Nasal Cavity

5. The Medial Wall of nasal cavity NERVE SUPPLY BLOOD SUPPLY

6. LATERAL WALL OF NOSE Lateral wall separates the nose- From the ORBIT above, with Ethmoidal air sinus. From MAXILLARY SINUS below, From LACRIMAL GROOVE , in front.

7. OPENINGS INTO LATERAL WALL OF NASAL CAVITY

8. LATERAL WALL OF NOSE NERVE SUPPLY BLOOD SUPPLY

9. APPLIED ANATOMY OF NOSE EPISTAXIS - LITTLE’S AREA is the most common site of bleeding from nose . RHINITIS – Inflammation of mucous membrane of nose. RHINORRHEA – Excessive nasal discharge due to allergic condition i.e. RHINITIS. Hypertrophy of mucosa over Inferior nasal concha leads to – DEVIATED NASAL SEPTUM (DNS) -> NASAL OBSTRUCTION.

10. THE PARANASAL SINUSES PNS are air containing cavities in the bones around nasal cavity. Paired PNS –4 Frontal air sinus – Frontal bone Ethmoidal air sinus – Ethmoidal bone Maxillary air sinus – Maxilla body Sphenoidal air sinus – Body of sphenoid GROWTH SPURTS – Rudimentary at birth. First at 7-8 years during eruption of teeth. Second at puberty.

11. MAXILLARY SINUS- Largest of paranasal sinus. Pyramidal shaped cavity within body of maxilla. DEVELOPMENT:- 1 ST to develop in 4 th month of IUL. Enlarge during 6-7 yrs. Fully develop at puberty. RELATIONS OF MAXILLARY SINUS :- ROOF- Floor of orbit FLOOR- Alveolar process of maxilla BASE- Lateral wall of nose APEX – Zygomatic process of maxilla ANTERIOR WALL – Facial surface of maxilla POSTERIOR WALL – Infratemporal fossa

12. MAXILLARY SINUS SUPPLY ARTERIAL SUPPLY – Facial,Infraorbital and Greater palatine arteries. VENOUS DRAINAGE – into facial vein LYMPHATIC DRAINAGE – Submandibular nodes NERVE SUPPLY – Infraorbital N. , Anterior, middle, posterior superior alveolar N. FUNCTIONS OF MAXILLARY SINUS :-

13. APPLIED ANATOMY OF MAXILLARY SINUS MAXILLARY SINUSITIS – Infection from nose, carious tooth, Referred pain ,infected sinus.

14. Applied - CARCINOMA OF MAXILLARY SINUS – Mucous lining of sinus. Upward invasion – into orbit causing PROPTOSIS (Protrusion of eyeball) DIPLOPIA (Double vision) Downward invasion –ulceration of palate DRAINAGE OF MAXILLARY SINUS – Drainage of the sinus is difficult because OSTIUM lies at a higher level than its floor. Surgically, Maxillary sinus drained through – CALDWELL – LUC OPERATION :- An opening made into canine fossa through the vestibule of mouth,deep to the upper lip. ANTROSTOMY or Antral puncture – By breaking the lateral wall of the inferior meatus.

15. ANTROSTOMY By using trocar and cannula,passed below the inferior nasal concha in an outward and backward direction

16. THANK YOU