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 1st Year
OMR DEPT.

2. THE NOSE

6. 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

9. The Roof of Nasal Cavity

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

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

14. OPENINGS INTO LATERAL WALL OF NASAL CAVITY

15. LATERAL WALL OF NOSE
NERVE SUPPLY BLOOD SUPPLY

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

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

22. MAXILLARY SINUS-
 Largest of paranasal sinus.
 Pyramidal shaped cavity within body of maxilla.
 DEVELOPMENT:-
 1ST to develop in 4th 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

28. 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 :-

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

31. 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 –
1. CALDWELL – LUC OPERATION :- An opening made into canine fossa through the
vestibule of mouth,deep to the upper lip.
2. ANTROSTOMY or Antral puncture – By breaking the lateral wall of the inferior
meatus.

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

33. THANK YOU