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Anatomy Encyclopedia Entry 1778001377

The **Pterygoid Muscle** is a pair of muscles located in the human skull, playing a crucial role in the movement of the jaw and the structure of the face. ## Overview The **Pterygoid Muscle** is a complex anatomical structure consisting of two muscles: the **Lateral Pterygoid** and the **Medial Pterygoid**. These muscles are situated in the infratemporal fossa, a region of the skull located below the zygomatic arch and the temporal bone. The **Pterygoid Muscle** is responsible for the movement of the mandible (lower jawbone), facilitating functions such as chewing, speaking, and yawning. The muscles are innervated by the **Mandibular Nerve**, a branch of the **Trigeminal Nerve**, which is the fifth cranial nerve (CN V). The **Pterygoid Muscle** is a vital component of the masticatory system, working in conjunction with other muscles such as the **Masseter**, **Temporalis**, and **Digastric** muscles to facilitate the movement of the jaw. The muscles are also involved in the stabilization of the mandible and the maintenance of the occlusion (the relationship between the upper and lower teeth). ## History/Background The study of the **Pterygoid Muscle** dates back to ancient civilizations, with early anatomists such as **Galen** and **Andreas Vesalius** providing detailed descriptions of the muscle's structure and function. However, it was not until the 19th century that the muscle's anatomy was fully understood, with the work of **Henri V. Vallois** and **Arthur Keith** providing significant contributions to the field. ## Key Information - The **Lateral Pterygoid** muscle is a fan-shaped muscle that originates from the **greater wing of the sphenoid bone** and inserts into the **mandibular condyle** and the **articular disc**. - The **Medial Pterygoid** muscle is a quadrilateral muscle that originates from the **sphenoid bone** and the **maxilla** and inserts into the **mandibular ramus**. - The **Pterygoid Muscle** is responsible for the protrusion and depression of the mandible, as well as the lateral movement of the jaw. - The muscle is also involved in the stabilization of the mandible and the maintenance of the occlusion. ## Significance The **Pterygoid Muscle** plays a crucial role in the functioning of the masticatory system, facilitating the movement of the jaw and the structure of the face. Dysfunctions of the muscle, such as **temporomandibular joint (TMJ) disorders**, can lead to pain and discomfort in the jaw and surrounding areas. Understanding the anatomy and function of the **Pterygoid Muscle** is essential for the diagnosis and treatment of these disorders. INFOBOX: - Name: **Pterygoid Muscle** - Type: **Muscle** - Date: **19th century** (fully understood) - Location: **Infratemporal fossa** - Known For: **Movement of the mandible and stabilization of the occlusion** TAGS: **Anatomy, Pterygoid Muscle, Lateral Pterygoid, Medial Pterygoid, Masticatory system, Temporomandibular joint, TMJ disorders, Facial structure**