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Anatomy Encyclopedia Entry 1778980084

** The human **_epiglottis_** is a small, leaf-shaped flap of cartilage located at the entrance of the larynx (voice box), playing a crucial role in protecting the airway during swallowing. **CONTENT:** ### Overview The **_epiglottis_** is a vital anatomical structure in the human body, situated at the top of the larynx (voice box). It is a small, leaf-shaped flap of cartilage that separates the trachea (windpipe) from the esophagus (food pipe). The **_epiglottis_** is an essential component of the upper respiratory tract, responsible for preventing food and liquids from entering the lungs during swallowing. When we eat or drink, the **_epiglottis_** closes, directing food and liquids into the esophagus, while keeping the airway open for breathing. The **_epiglottis_** is made up of a thin layer of cartilage, covered by a mucous membrane. It is attached to the thyroid cartilage and the arytenoid cartilages, which are two small cartilages located on either side of the larynx. The **_epiglottis_** is innervated by the vagus nerve, which provides sensory information and controls its movement. ### History/Background The **_epiglottis_** has been studied extensively in the field of anatomy, with early descriptions dating back to ancient civilizations. The Greek physician Galen (129-216 AD) was one of the first to describe the **_epiglottis_** in detail, noting its role in protecting the airway during swallowing. In the 16th century, the Flemish anatomist Andreas Vesalius (1514-1564) provided a more detailed description of the **_epiglottis_**, including its structure and function. ### Key Information The **_epiglottis_** is approximately 2-3 cm (0.8-1.2 in) in length and 1-2 cm (0.4-0.8 in) in width. It is a flexible structure that can move up and down, depending on the position of the larynx. During swallowing, the **_epiglottis_** closes, directing food and liquids into the esophagus. When we breathe, the **_epiglottis_** opens, allowing air to pass through the larynx and into the lungs. The **_epiglottis_** can be affected by various conditions, including epiglottitis, a rare but potentially life-threatening infection that can cause the **_epiglottis_** to become inflamed and swollen. Other conditions, such as laryngitis and vocal cord nodules, can also affect the **_epiglottis_** and the surrounding laryngeal structures. ### Significance The **_epiglottis_** plays a crucial role in protecting the airway during swallowing, preventing food and liquids from entering the lungs. Its dysfunction can lead to serious complications, including aspiration pneumonia and respiratory failure. Understanding the anatomy and function of the **_epiglottis_** is essential for healthcare professionals, particularly those working in emergency medicine and respiratory care. **INFOBOX:** - **Name:** Epiglottis - **Type:** Anatomical structure - **Date:** Ancient civilizations (Galen, 129-216 AD) - **Location:** Larynx (voice box) - **Known For:** Protecting the airway during swallowing **TAGS:** Epiglottis, Anatomy, Larynx, Voice Box, Swallowing, Aspiration Pneumonia, Respiratory Care, Emergency Medicine, Cartilage, Mucous Membrane, Vagus Nerve.