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The Nasal Cavity

The Nasal Cavity . What is the function of the nasal cavity think about the concha ? . The nasal cavity is that part of the upper respiratory tract where inhaled air is warmed, humidified and filtered. What is unique about this space and CN I.

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The Nasal Cavity

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  1. The Nasal Cavity

  2. What is the function of the nasal cavity think about the concha? • The nasal cavity is that part of the upper respiratory tract where • inhaled air is warmed, • humidified and • filtered

  3. What is unique about this space and CN I • It is the only site where a cranial nerve (CN I, olfactory) has its peripheral process extending outside of the body (into the nasal mucosa).

  4. The roof of the nasal cavity is formed by? • cribriformplate of the ethmoid bone. • What CN is found here ? • The olfactory epithelium containing the olfactory nerve (CN I) is found in the roof of the nasal cavity

  5. The floor of the nasal cavity is formed by which bone (s)? • palatine process of the maxillae • horizontal processes of the palatine bones

  6. The nasal septum forms the medial wall what bones form it? • Vomer • The perpendicular plate of ethmoid

  7. The lateral wall of the nasal cavity is formed by what ? • the 3 conchae, • superior, • middle • and inferio

  8. Beneath each concha is what? • a meatus (superior, middle and inferior).

  9. Above the superior concha is what? • the sphenoethmoidalrecess • What sinus is associated with it? • The sphenoidsinus

  10. Anteriorly, the nares open into what ? • the face.

  11. What is the Choana? • Is found posterior to the three concha and open into the nasopharynx

  12. The Superior meatus connects with what? Middle? Inferior ( click slowly to quiz your self) • The superior meatus connects with the posterior ethmoid air cells. • The Middle Sinus ? • The middle meatus contains the ethmoid bulla, an elevation with openings into the middle ethmoid air cells. • The middle meatus also contains the hiatus semilunaris which is a curved groove. • The middle meatus: Openings from the maxillary sinus, frontal sinus, and anterior ethmoid air cells are found in the hiatus semilunaris. • The Inferior sinus? • The inferior meatus has an opening for the nasolacrimal duct.

  13. What supplies blood to the nasal cavity? • The sphenopalatine artery supplies most of the nasal cavity. • The anterosuperior portion of the nasal mucosa is supplied by what ? • branches of the ophthalmic artery and nerve. • The posteroinferior portions are supplied by branches of what? • maxillary artery and nerve

  14. This site is associated with chronic epistaxis? • Kiesselbach’s plexus • Where on the septum is this located at? • on the anteroinferior septum is an anastomoses of the major arteries that supply the nasal cavity,

  15. What are the names of the 4 paranasal sinuses? • frontal, • maxillary, • sphenoid • ethmoid.

  16. Which sinuses are present at birth? • The maxillary and ethmoid sinuses are present at birth although the ethmoid sinus is not visible by X-ray until 2 years of age

  17. When does the sphenoid form? • The sphenoid sinus begins to form at 2 years of age.

  18. When is the frontal sinus detected ? • The frontal sinus is detectable at 7 years of age.

  19. Why does the maxillary sinus always gets infected? • drainage superiorly and against gravity into the middle meatus • Tooth ache is ass.ed with the maxillary sinus because? • When swollen it pushes on the superior alveolar nerve

  20. ethmoid sinusitis can spread to where and cause what? • across the thin lateral wall of the ethmoid bone into the orbit of the eye to produce an orbital cellulitis

  21. Infection may also spread from the sphenoid sinus into what locations? • the brain, • the cavernous sinus, • internal carotid artery, • optic nerve and chiasm • and pituitary gland

  22. The cavernous sinus contains what? • the oculomotor (CN III), • trochlear(CN IV), • abducens(CN VI) and ophthalmic branch of the trigeminal nerve (CN V1); • therefore infection can result in what symptoms?: • diplopiadue to dysfunction of the extraocular muscles.

  23. Where is the “danger triangle” and why is it so dangerous? • between the upper lip and the bridge of the nose. • Venous drainage from this area may drain (and thus carry infections and thrombi/emboli) via the valveless • facial vein the angular vein, the superior and inferior ophthalmic veins  cavernous sinuses.

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