Functional anatomy of the upper airway

Area of Science:

• Anatomy and Physiology
• Respiratory System
• Aerodigestive Tract

Background:

• The upper airway comprises the pharynx and nasal cavities, with functional inclusion of the larynx and trachea.
• The oral cavity serves as an alternate respiratory entrance and is involved in digestion and phonation.
• Upper airway anatomy is critical for functions including gas conditioning, olfaction, voice resonance, and airway protection.

Purpose of the Study:

• To detail the anatomical structures and functional roles of the upper airway.
• To highlight the significance of upper airway anatomy in medical procedures like intubation.
• To explain the protective and functional mechanisms of the pharynx and larynx.

Main Methods:

• Anatomical description of the nasal cavities, oral cavity, pharynx, larynx, and trachea.
• Functional analysis of each component in respiration, digestion, and phonation.
• Discussion of clinical relevance, including airway obstruction and intubation.

Main Results:

• The nose warms and humidifies air, houses olfactory receptors, and resonates voice.
• The pharynx serves as a common pathway for air and food, with distinct naso-, oro-, and laryngopharynx regions.
• The larynx acts as a protective valve, essential for respiration, phonation, and preventing aspiration.

Conclusions:

• The intricate anatomy of the upper airway supports vital functions and presents challenges in airway management.
• Understanding the upper airway's structure is fundamental for effective medical interventions.
• Variations in anatomy can impact the success of procedures such as orotracheal intubation.