20 Questions
What divides the external nose and the nasal cavity into right and left halves?
The nasal septum
Which artery supplies the skin of the external nose?
Maxillary artery
What forms the framework of the external nose below?
Plates of hyaline cartilage
Which nerve supplies the skin of the ala and the lower part of the septum?
Facial nerve
What forms the lateral margin of the external nose?
Ala nasi
What is the function of the paranasal sinuses?
Act as shock absorbers in trauma
Which artery anastomoses with the septal branch of the superior labial branch of the facial artery in the region of the nasal cavity vestibule?
Sphenopalatine artery
Which nerve supplies the olfactory nerves from the olfactory mucous membrane in the nasal cavity?
Olfactory Nerves (SVA)
Where is Kiesselbach's plexus located in the nasal cavity?
Kiesselbach's triangle
Which bone contains the ethmoid sinuses and separates them from the orbit?
Ethmoid bone
Which arteries anastomose to form Kiesselbach's plexus in the nasal cavity?
Anterior ethmoidal artery (branch of the ophthalmic artery), Greater palatine artery (from the maxillary artery), Septal branch of the superior labial artery (from the facial artery)
Which sinuses lie within the body of the sphenoid bone and extend between the dorsum sellae and post clinoid processes?
Sphenoidal sinuses
Which nerves supply the olfactory nerves from the olfactory mucous membrane in the nasal cavity?
Ophthalmic division (V1) and maxillary division (V2) of the trigeminal nerve
What is the main function of the paranasal sinuses?
To act as resonators of the voice
Which arteries are involved in providing blood supply to the nasal cavity?
Branches of the maxillary artery, including the sphenopalatine artery and Kiesselbach's plexus
Where is Kiesselbach's plexus located in the nasal cavity?
Anteroinferior part of the nasal septum
Which artery supplies the skin of the external nose?
Superior labial artery
What divides the external nose and the nasal cavity into right and left halves?
Nasal septum
Which nerve supplies the skin of the ala and the lower part of the septum?
Anterior ethmoidal branch of V1
What forms the framework of the external nose below?
Septal cartilage
Study Notes
The Nose
- The nose consists of the external nose and the nasal cavity, divided by a septum into right and left halves.
- The external nose has two elliptical orifices called the naris (nostrils), separated from each other by the nasal septum.
- The lateral margin, the ala nasi, is rounded and mobile.
Framework of the External Nose
- Above, the framework is formed by the nasal bones, frontal processes of the maxillae, and the nasal part of the frontal bone.
- Below, the framework is formed of plates of hyaline cartilage.
Blood Supply of the External Nose
- The skin of the external nose is supplied by branches of the ophthalmic and maxillary arteries.
- The skin of the ala and the lower part of the septum are supplied by branches from the facial artery.
Nerve Supply of the External Nose
- Supplied by the infra-trochlear and external nasal branches of the ophthalmic nerve (CN V).
- Supplied by the infraorbital branch of the maxillary nerve (CN V).
Nasal Cavity
- Has a floor, a roof, a lateral wall, and a medial or septal wall.
Test your knowledge of the anatomy of the nose and paranasal sinus with this quiz. Explore the external nose, nasal cavity, and their structures and functions.
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