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Anatomy Encyclopedia Entry 1775538309

** The human **_epiglottis_** is a small, leaf-like flap of cartilage located at the entrance of the larynx (voice box) that separates the trachea (windpipe) from the esophagus, playing a crucial role in preventing food and liquids from entering the lungs. **CONTENT:** ## Overview The **_epiglottis_** is a vital anatomical structure in the human body, situated at the top of the larynx, just below the tongue. It is a small, leaf-like flap of cartilage that serves as a protective barrier between the trachea and the esophagus. The **_epiglottis_** is approximately 2-3 centimeters in length and is attached to the thyroid cartilage by a fibrous membrane. Its primary function is to prevent food and liquids from entering the lungs, thereby protecting the airway from aspiration. During swallowing, the **_epiglottis_** moves downward, covering the entrance to the larynx and directing food and liquids into the esophagus. When we breathe, the **_epiglottis_** moves upward, allowing air to pass through the larynx and into the lungs. The **_epiglottis_** is also involved in the production of sound, as it vibrates when air passes through the larynx, contributing to our ability to speak and produce different tones. ## History/Background The **_epiglottis_** has been a subject of interest for anatomists and medical professionals for centuries. The Greek physician Galen (129-216 AD) was one of the first to describe the **_epiglottis_** in detail, noting its role in swallowing and respiration. In the 16th century, the Flemish anatomist Andreas Vesalius (1514-1564) provided a more accurate description of the **_epiglottis_**, highlighting its importance in preventing aspiration. ## Key Information The **_epiglottis_** is composed of a thin layer of cartilage, covered by a mucous membrane. It is innervated by the superior laryngeal nerve, which provides sensation to the larynx and surrounding structures. The **_epiglottis_** is also involved in the regulation of breathing, as it helps to control the rate and depth of respiration. Dysfunction of the **_epiglottis_** can lead to a range of respiratory and swallowing disorders, including epiglottitis, a potentially life-threatening condition characterized by inflammation of the **_epiglottis_**. Other conditions, such as laryngitis and vocal cord nodules, can also affect the **_epiglottis_**, leading to symptoms such as hoarseness, coughing, and difficulty swallowing. ## Significance The **_epiglottis_** plays a vital role in maintaining the integrity of the airway, preventing food and liquids from entering the lungs and protecting the respiratory system from aspiration. Its dysfunction can have serious consequences, including respiratory failure and even death. Understanding the anatomy and function of the **_epiglottis_** is essential for medical professionals, including otolaryngologists, pulmonologists, and emergency medicine specialists. **INFOBOX:** - Name: Epiglottis - Type: Anatomical structure - Date: Ancient Greece (Galen, 129-216 AD) - Location: Larynx (voice box) - Known For: Preventing aspiration and regulating breathing **TAGS:** Epiglottis, Anatomy, Larynx, Trachea, Esophagus, Swallowing, Respiration, Aspiration, Epiglottitis, Laryngitis, Vocal Cord Nodules.