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The mylohyoid elevates the hyoid and the tongue. This is particularly important during swallowing and speaking. Alternatively, if other muscles are used to keep the position of the hyoid fixed, then the mylohoid depresses the mandible. It also functions as reinforcing the floor of mouth. This muscle is supplied by inferior alveolar nerve (branch of mandibular nerve). See more about this muscle here Mylohyoid muscle - Wikipedia. You can find the function of any other muscle in the same way, more easily than asking on Quora and awaiting answers that may or may not be right.
A member of the infrahyoid group of muscles, the thyrohyoid muscle elevates the thyroid gland while depressing the hyoid bone. These actions play a role in swallowing and speech. The thyroid gland is located in the center of the neck, just above the collarbone. The hyoid lies in the neck, just below the lower jawbone, or mandible. A small muscle, the thyrohyoid looks like a vertical extension of the sternothyroideus muscle within the neck. It originates in the thyroid cartilage (the Adamâs apple), and it inserts into the greater cornu of the hyoid bone, which is the hyoidâs back-most area.