Chapter 10 - Section 10.2 - Study Guide - Assess Your Learning Outcomes - Page 371: 10

The infrahyoid muscles, also known as the strap muscles, are a group of muscles located below the hyoid bone in the neck. These muscles have various functions, including depressing the hyoid bone and larynx, stabilizing the neck, and assisting with swallowing and speech. Here are the muscles you mentioned from the infrahyoid group: 1. **Omohyoid Muscle:** - The omohyoid muscle consists of two bellies, the superior belly and the inferior belly, connected by an intermediate tendon. - The superior belly of the omohyoid originates from the intermediate tendon and inserts into the hyoid bone. - The inferior belly of the omohyoid extends from the intermediate tendon and inserts into the upper border of the scapula. - Function: The omohyoid muscle helps depress the hyoid bone and larynx during swallowing and speech. It also plays a role in stabilizing the neck. 2. **Sternohyoid Muscle:** - The sternohyoid muscle is a thin, strap-like muscle. - It originates from the posterior surface of the manubrium of the sternum and the clavicle. - It inserts into the body of the hyoid bone. - Function: The sternohyoid muscle primarily depresses the hyoid bone and larynx, aiding in swallowing and speech. It also stabilizes the neck. 3. **Thyrohyoid Muscle:** - The thyrohyoid muscle is a small muscle located between the thyroid cartilage and the hyoid bone. - It originates from the thyroid cartilage. - It inserts into the body and greater cornu of the hyoid bone. - Function: The thyrohyoid muscle assists in depressing the hyoid bone and elevating the larynx during swallowing and speech. 4. **Sternothyroid Muscle:** - The sternothyroid muscle is a slender muscle located below the sternohyoid. - It originates from the posterior surface of the manubrium of the sternum. - It inserts into the thyroid cartilage. - Function: The sternothyroid muscle helps depress the thyroid cartilage and larynx during swallowing and speech. It also aids in stabilizing the neck. The infrahyoid muscles work together to perform their functions, which include depressing the hyoid bone and larynx during swallowing to facilitate the movement of food and liquid into the esophagus and stabilizing the neck during various activities.

The infrahyoid muscles, also known as the strap muscles, are a group of muscles located below the hyoid bone in the neck. These muscles have various functions, including depressing the hyoid bone and larynx, stabilizing the neck, and assisting with swallowing and speech. Here are the muscles you mentioned from the infrahyoid group: 1. **Omohyoid Muscle:** - The omohyoid muscle consists of two bellies, the superior belly and the inferior belly, connected by an intermediate tendon. - The superior belly of the omohyoid originates from the intermediate tendon and inserts into the hyoid bone. - The inferior belly of the omohyoid extends from the intermediate tendon and inserts into the upper border of the scapula. - Function: The omohyoid muscle helps depress the hyoid bone and larynx during swallowing and speech. It also plays a role in stabilizing the neck. 2. **Sternohyoid Muscle:** - The sternohyoid muscle is a thin, strap-like muscle. - It originates from the posterior surface of the manubrium of the sternum and the clavicle. - It inserts into the body of the hyoid bone. - Function: The sternohyoid muscle primarily depresses the hyoid bone and larynx, aiding in swallowing and speech. It also stabilizes the neck. 3. **Thyrohyoid Muscle:** - The thyrohyoid muscle is a small muscle located between the thyroid cartilage and the hyoid bone. - It originates from the thyroid cartilage. - It inserts into the body and greater cornu of the hyoid bone. - Function: The thyrohyoid muscle assists in depressing the hyoid bone and elevating the larynx during swallowing and speech. 4. **Sternothyroid Muscle:** - The sternothyroid muscle is a slender muscle located below the sternohyoid. - It originates from the posterior surface of the manubrium of the sternum. - It inserts into the thyroid cartilage. - Function: The sternothyroid muscle helps depress the thyroid cartilage and larynx during swallowing and speech. It also aids in stabilizing the neck. The infrahyoid muscles work together to perform their functions, which include depressing the hyoid bone and larynx during swallowing to facilitate the movement of food and liquid into the esophagus and stabilizing the neck during various activities.