explaining nasal cavity and paranasal sinuses

1. Anatomy of Nose andParanasal
Sinus
By:SHIVANSH

2. TheNose
• Thenose consists of the
externalnose and the
nasal cavity,
• Both are divided by a
septum into right and
left halves.

3. ExternalNose

4. ExternalNose

5. Blood Supplyof the ExternalNose
• Opthalmicartery
• Maxillaryartery
• Facialartry

6. Nerve Supplyof the ExternalNose

7. TheFloor and Roof of NasalCavity

8. TheRoof of NasalCavity
• Narrow
• It isformed
– anteriorly beneath thebridge
of the nose by the nasal and
frontal bones,
– in the middle by the
cribriform plate ofthe
ethmoid,
– located beneath the anterior
cranial fossa,
– posteriorly by thedownward
sloping body of thesphenoid

9. TheMedial Wall of NasalCavity
• Nasalseptum consistsof
the perpendicular plate
of the ethmoid bone
(superior), the vomer
(inferior) and septial
cartilage (anterior)
Perpendicular
Plate(ethmoid)
Septal
Cartilage
Vomer

10. TheLateral Wallsof NasalCavity

11. OpeningsInto the NasalCavity
Nasolacrimal Canal drainsinto
Inferior Meatus
Sphenoid sinus opensinto
sphenoethmoidalrecess
Posterior ethmoidal aircells
open into superiormeatus
Anterior &middle ethmoid air
cells,maxillary and frontal
sinuses open into middle
meatus

12. Blood Supplyto the NasalCavity

13. Blood Supplyto the NasalCavity
• Sphenopalatine and Greater palatine
arteries, branches of the maxillary
artery.
• Anterior ethmoidal artery and posterior
ethmoidal artery, branches of the
ophthalmic artery.
• Septal Branches of the superior labial
artery, a branch of the facial artery,
which suppliesthe vestibule of
the nasal cavity.

14. Nerve Supplyof the NasalCavity
CN I– Olfactory Nerves (SVA)

16. Nose Bleeding (Epistaxis)
• Broken Nose
• Thrombocytopenia
• Hypertension
• Allergic Rhinitis

17. Broken Nose
• Fights
• Sports injuries
• X Ray,CT scan
• Ice wrapped
• Surgery

18. TheParanasalSinuses
• Theparanasal sinusesare
cavities found in the
interior of the maxilla,
frontal, sphenoid, and
ethmoid bones.
• Theyare lined with
mucoperiosteum and
filled with air.
• Theycommunicate with
the nasal cavity through
relatively smallapertures.

19. Drainageof Mucus and Functionof
ParanasalSinuses
• Themucus produced by the mucous membrane is
moved into the nose by ciliary action of the columnar
cells.
• Drainage of the mucus is also achieved by thesiphon
action created during the blowing ofthe nose.
• Functions:
1. Resonators of the voice
2. Theyalso reduce the skullsweight
3. Help wam and moisten inhaledair
4.Act asshock absorbers in trauma