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Nose and Nasal Cavity | Structure & Functions

The nose and nasal cavity make up the first portion of the upper respiratory tract. Their locations and structures are best viewed when the head is shown in image descriptionsagittal section.

The first portion of the respiratory tract is made up of the image descriptionnose (or external nose) and an open inner chamber called the image descriptionnasal cavity.

Protruding prominently from the face, the nose serves as a vent for air exchange.

 

A lateral view of the head
sagittal view of the head showing the nose and the nasal cavity
Nose labeled on sagittal view the nose and the nasal cavity
Sagittal view of the nasal cavity the nose and the nasal cavity
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Two openings called image descriptionanterior nares (or nostrils; exterior nares) allow air to enter the nose and pass into the nasal cavity. Individually, each opening is referred to as an anterior naris.

sagittal view of the head showing the nose and the nasal cavity
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Inside the nasal cavity, inhaled air is warmed, moistened, and cleaned so it can travel safely into other parts of the respiratory tract. The nasal cavity also contains structures to detect chemical odorants and resonate the voice. After circulating over the nasal cavity structures, air passes into the pharynx through two image descriptionposterior nares (or choanae; internal nares). Individually, each opening is referred to as a posterior naris.

sagittal view of the head showing the nose and the nasal cavity
Posterior nares labeled on sagittal view
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An Overview of the Nose and Nasal Cavity:

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Test Yourself on Introduction to the Nose and Nasal Cavity with answers hidden
Test Yourself on Introduction to the Nose and Nasal Cavity with answers shown
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