NASAL CAVITY & PNS paranasal air sinuses.pptx

Paranasal air sinuses

1. NASAL CAVITY & PARANASAL SINUSES --

2. NASAL CAVITY

3. TURBINATE-Projection on lat wall of nose MEATUS-space below turbinate CONCHAE- Bony part Of turbinate IC INDEPENDENT bone MC&SC(Ethmoid bone) SPHENOETHMOIDAL RECESS-Area above ST CHOANA-post opening Of nasal cavity

4. Nostril

5. choanae

6. Sinuses NLD

7. BOUNDARIES ROOF FLOOR MEDIAL WALL(SEPTUM) LATERAL WALL

8. ROOF

9. FLOOR

10. BONY SEPTUM

11. ACCESSORY BONES Nasal bones Nasal spines of frontal bones Rostrum & crest of sphenoid Nasal crest of maxillary & palatine bones

12. CARTILAGINOUS PART Septal process of inf nasal cart.

13. CARTILAGINOUS SEPTUM

14. LATERAL WALL

15. Nasolacrimal canal formed by –lacrimal groove of maxilla, descending process of lacrimal bone & lacrimal process of inferior nasal concha.

16. several paranasal sinuses have their openings in this meatus as follows: a) Maxillary air sinus: opens into the hiatus semilunaris below the bulla ethmoidalis . b) Anterior ethmoidal sinus : opens into the hiatus semilunaris in front of the bulla ethmoidalis . c) Middle ethmoidal sinus : opens on the bulla ethmoidalis . d) Frontal sinus : opens into the upper part of the hiatus semilunaris . Openings of the middle meatus :

17. VASCULAR SUPPLY Ant & post ethmoidal A – roof of nose Sphenopalatine A- conchae , meatus & post inf part of nasal septum Greater palatine A- inf meatus & little’s area of nasal septum( kiesselbach’s plexus) labial br of facial A- ant & inf part

18. VENOUS DRAINAGE Ant part of nose- veins accompanying ant ethmoidal A – opthalmic or facial V Post part of nose- sphenopalatine a– pterygoid venous plexus Few veins pass through cribriform plate and connect with those of frontal lobe of brain Foramen caecum also transmit nasal vein to sup saggital sinus

19. NERVE SUPPLY Olfactory N – sense of smell Nerve of general sensation – a)Ant ethmoidal N b) Sphenopalatine ganglion c)Br of infraorbital N 3. Autonomic– derived from vidian N through pterygopalatine ganglion which innervates mucous glands.

20. NERVE SUPPLY Ant ethmoidal N- roof of nasal cavity Lat internal br - ant part of lat wall Med internal br - ant & upper part of septum Infraorbital N- vestibule Ant sup alveolar N - floor near ant nasal spine - ant part of lat wall Lat post sup and inf nasal br ( grt palatine N)- post 3/4 th of lat wall,roof & floor Med post sup nasal & nasopalatine N- inf part of nasal septum Br from N to pteygoid canal – upper & post part of roof & septum.

21. LYMPHATIC DRAINAGE

22. PARANASAL SINUSES

23. Functional importance: They have the following functions: * They make the skull lighter (filled with air). * They act as resonating chambers for the voice . They increase the surface area of the nasal mucous membrane and thus help warming the air before entering the lung. Aid in growth of facial skeleton after birth.

24. Frontal sinuses

25. ETHMOIDAL AIR SINUSES

26. SPHENOIDAL AIR SINUSES

27. Relations

28. MAXILLARY AIR SINUSES

29. Air sinuses Nerve supply Artery supply Lymphatic drainage Frontal Supraorbital N Orbital br of pterygopalatine ganglia Supraorbital A Ant ethmoidal A Submandibular LN Ethmoidal Ant & post ethmoidal N Orbital br of pterygopalatine ganglia Ant & post ethmoidal A( opthalmic A) Nasal br of sphenopalatine A Submandibular Retropharyngeal Sphenoidal post ethmoidal N Orbital br of pterygopalatine ganglia post ethmoidal A( opthalmic A) Nasal br of sphenopalatine A Retropharyngeal LN Maxillary Infraorbital N Ant , middle & post sup alveolar br of maxillary N Orbital br of pterygopalatine ganglia Ant , middle & post sup alveolar br of maxillary A Infraorbita l A Greater palatine A Submandibular LN

30. APPLIED ANATOMY Epistaxis Dangerous area of face Deviation of nasal septum Nasal polyp Sinusitis

31. Retrograde
infections from
nasal area can
spread to cavernous
sinus