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Questions and Answers
Which region of the nasal cavity is lined by skin and contains hair follicles?
Which region of the nasal cavity is lined by skin and contains hair follicles?
What is the largest part of the nasal cavity?
What is the largest part of the nasal cavity?
Which structure is responsible for the drainage of the paranasal sinuses?
Which structure is responsible for the drainage of the paranasal sinuses?
Which region of the nasal cavity is located at the apex and is lined by olfactory epithelium?
Which region of the nasal cavity is located at the apex and is lined by olfactory epithelium?
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Which turbinate is not directly associated with the nasal cavity?
Which turbinate is not directly associated with the nasal cavity?
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What forms the upper part of the external nose?
What forms the upper part of the external nose?
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Which part of the external nose is formed of fatty tissue?
Which part of the external nose is formed of fatty tissue?
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The framework below the nasal bones and frontal process of the maxilla is made of what?
The framework below the nasal bones and frontal process of the maxilla is made of what?
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What lines the lower part of the external nose?
What lines the lower part of the external nose?
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The cartilages found in the external nose include upper lateral cartilages and what other type?
The cartilages found in the external nose include upper lateral cartilages and what other type?
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Which bone forms part of the roof of the nasal cavity?
Which bone forms part of the roof of the nasal cavity?
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Which structure separates the nasal cavity from the oral cavity?
Which structure separates the nasal cavity from the oral cavity?
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What forms the medial wall of the nasal cavity?
What forms the medial wall of the nasal cavity?
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Which of the following is found in the lateral wall of the nasal cavity?
Which of the following is found in the lateral wall of the nasal cavity?
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Which bone is located in the roof of the nasal cavity separating it from the cranial cavity?
Which bone is located in the roof of the nasal cavity separating it from the cranial cavity?
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Where is the superior meatus located?
Where is the superior meatus located?
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Which structure is a rounded bulge formed by the presence of the middle ethmoidal air sinus?
Which structure is a rounded bulge formed by the presence of the middle ethmoidal air sinus?
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Which meatus receives the opening of the nasolacrimal duct?
Which meatus receives the opening of the nasolacrimal duct?
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What is the deep curved groove just below the bulla ethmoidalis called?
What is the deep curved groove just below the bulla ethmoidalis called?
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What is the space above the superior concha called?
What is the space above the superior concha called?
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Which arteries supply the nasal cavity from the external carotid artery (ECA)?
Which arteries supply the nasal cavity from the external carotid artery (ECA)?
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To which venous plexuses does blood drain posteriorly from the nasal cavity?
To which venous plexuses does blood drain posteriorly from the nasal cavity?
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Which nerve is responsible for the general sensation in the nasal cavity?
Which nerve is responsible for the general sensation in the nasal cavity?
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From which spinal cord segment are the sympathetic fibers to the nasal cavity derived?
From which spinal cord segment are the sympathetic fibers to the nasal cavity derived?
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To which lymph nodes does lymph drain from the posterior part of the nasal cavity?
To which lymph nodes does lymph drain from the posterior part of the nasal cavity?
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Which anatomical structure allows infections in the nasal cavity to spread to the middle ear?
Which anatomical structure allows infections in the nasal cavity to spread to the middle ear?
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What is the name of the area in the nasal cavity where epistaxis commonly occurs?
What is the name of the area in the nasal cavity where epistaxis commonly occurs?
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Which arteries are involved in the anastomosis at Little's area?
Which arteries are involved in the anastomosis at Little's area?
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How can infections spread from the nasal cavity to the lacrimal apparatus?
How can infections spread from the nasal cavity to the lacrimal apparatus?
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Which anatomical regions communicate with the nasal cavity to facilitate the spread of infections?
Which anatomical regions communicate with the nasal cavity to facilitate the spread of infections?
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Which artery supplies the antero-superior part of the nasal cavity?
Which artery supplies the antero-superior part of the nasal cavity?
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Which nerve innervates the antero-inferior part of the nasal cavity?
Which nerve innervates the antero-inferior part of the nasal cavity?
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Which artery is NOT a branch that supplies the anterior half of the nasal cavity?
Which artery is NOT a branch that supplies the anterior half of the nasal cavity?
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Which artery is located on the right side of the anatomical illustration provided?
Which artery is located on the right side of the anatomical illustration provided?
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Which nerve is depicted on the left side of the illustration?
Which nerve is depicted on the left side of the illustration?
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What divides the nasal cavity into right and left halves?
What divides the nasal cavity into right and left halves?
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Where do both halves of the nasal cavity open posteriorly?
Where do both halves of the nasal cavity open posteriorly?
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What is the composition of the nasal septum?
What is the composition of the nasal septum?
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Which bones form the roof of the nasal cavity?
Which bones form the roof of the nasal cavity?
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What role do the superior, middle, and inferior conchae play?
What role do the superior, middle, and inferior conchae play?
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What is the posterior boundary of the nasal cavity?
What is the posterior boundary of the nasal cavity?
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Which part of the nasal cavity is attached to the palatine process of the maxilla?
Which part of the nasal cavity is attached to the palatine process of the maxilla?
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What are the meatus of the nasal cavity?
What are the meatus of the nasal cavity?
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Which artery is located in the postero-superior part of the posterior half of the nasal cavity?
Which artery is located in the postero-superior part of the posterior half of the nasal cavity?
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Which nerve is present in the posterior inferior part of the nasal cavity?
Which nerve is present in the posterior inferior part of the nasal cavity?
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Which artery supplies the postero-inferior part of the nasal cavity?
Which artery supplies the postero-inferior part of the nasal cavity?
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Which nerve innervates the postero-superior part of the nasal cavity?
Which nerve innervates the postero-superior part of the nasal cavity?
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What structure is not involved in the posterior half of the nasal cavity?
What structure is not involved in the posterior half of the nasal cavity?
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Study Notes
The External Nose
- The external nose is formed by short nasal bones, the frontal process of the maxilla, and a cartilaginous framework.
- The ala is formed of fatty tissue and is lined by true skin.
The Nasal Cavity
- The nasal cavity is divided into right and left halves by the nasal septum.
- Each half opens anteriorly on the face through anterior nasal apertures and posteriorly into the nasopharynx through posterior nasal apertures.
- Each half is rectangular in shape, with a roof, floor, medial (septal) wall, and lateral wall.
- The nasal septum is composed of cartilage and bone and is attached to the roof and floor of the nasal cavity.
- The nasal cavity contains three turbinate bones (superior, middle, and inferior conchae) which divide the nasal cavity into three passages known as meatus.
- The turbinate bones are covered by a mucous membrane and are involved in warming, moistening, and filtering air.
Regions of the Nasal Cavity
- Nasal Vestibule: the dilated part just internal to the naris, lined by skin and containing hair follicles.
- Respiratory Region: the largest part, lined by respiratory epithelium and rich in neurovascular supply.
- Olfactory Region: occupies the apex of the nasal cavity and is lined by olfactory epithelium.
Boundaries of the Nasal Cavity
- Roof: formed by the bones of the skull (nasal spine of frontal bone, cribriform plate of ethmoid bone, and inferior aspect of body of sphenoid bone).
- Floor: the hard palate.
- Medial wall: the nasal septum.
- Lateral wall: formed by the nasal aspect of the ethmoid labyrinth, nasal aspect of maxilla, and perpendicular plate of palatine bone.
Meatuses of the Lateral Wall
- Superior meatus: below the superior concha.
- Middle meatus: below the middle concha, containing the bulla ethmoidalis and hiatus semi-lunaris.
- Inferior meatus: below the inferior concha, receiving the opening of the nasolacrimal duct.
Blood and Nerve Supply of the Nasal Cavity
- Arteries: anterior and posterior ethmoidal, facial, greater palatine, and anterior superior alveolar.
- Nerves: anterior ethmoidal, anterior superior alveolar, olfactory nerve (1st cranial nerve), and trigeminal nerve (5th cranial nerve).
- Lymphatic drainage: to submandibular lymph nodes (anteriorly) and retropharyngeal and upper deep cervical lymph nodes (posteriorly).
Applied Anatomy
- Infections can spread from the nose to the anterior cranial fossa, nasopharynx, middle ear, paranasal sinuses, and the lacrimal apparatus.
- The Little's area is a common site of epistaxis (bleeding from the nose), located in the lower part of the nasal septum at the anastomosis between branches of facial and sphenopalatine arteries.
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Description
This quiz covers the anatomy of the external nose, including its formation, composition, and cartilaginous framework. Learn about the nasal bones, ala, and other structures that make up the external nose.
