![]() The muscles of the middle ear contract to dampen the amplitude of vibrations from the eardrum to the inner ear. In fact, the smallest muscle of the skeleton is the stapedius, which measures around 1 millimeter (1/20th of an inch) in length. Located inside the eye, the intrinsic eye muscles work tirelessly to dilate the pupils and focus the lens of the eye to produce clear vision.Įven the middle ear takes part in the muscular system of the head and neck. These muscles produce extremely fine movements almost constantly throughout the day with tremendous speed and accuracy. Of these, four extrinsic muscle sets (connecting the tongue to the surrounding bones) move the tongue in virtually any direction, with fine shape changes (such as for speech) the province of the four intrinsic tongue muscles.Īs for the eye, six extrinsic eye muscles provide superior, inferior, lateral, and medial motion, as well as rotation of the eyeball. These muscles, including the masseter and temporalis, elevate the jaw forcefully during chewing and gently during speech.Īn extensive complement of tightly interlaced muscles allows the tongue a range of complex movements for chewing and swallowing, as well as the important function of producing speech. Producing the body’s ability to close the mouth, bite, and chew food, the muscles of mastication move the mandible relative to the rest of the skull. These muscles, including the zygomaticus major and orbicularis oris, pull on the skin to produce a seemingly infinite number of facial expressions and to move the lips and cheeks during speech and eating. The muscles of the face are unique among groups of muscles in the body. While most muscles connect to and move only bones, facial muscles mostly connect bones to skin. These diverse tasks require both strong, forceful movements and some of the fastest, finest, and most delicate adjustments in the entire human body. The muscles of the head and neck perform many important tasks, including movement of the head and neck, chewing and swallowing, speech, facial expressions, and movement of the eyes.
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