New Study Reveals Lesser-Known Facial Muscle's Key Role in Expressions and Actions
Scientists have identified a lesser-known facial muscle, the depressor labii inferioris, playing a significant role in various facial expressions and actions. This muscle, first described in the 18th century, is located in the jaw area and aids in drawing the lower lip down and to the side.
The depressor labii inferioris originates within the lower jaw and inserts into the skin of the lower lip, blending with the orbicularis oris muscle. It extends the fibers of the platysma muscle and combines with yellow fat. This four-sided muscle is supplied by the facial nerve and works alongside others like the risorius, the depressor anguli oris, and the mentalis to lower the lip.
It plays a crucial role in various activities such as playing the trumpet and kissing. However, disorders affecting this muscle can lead to decreased movement, loss of control, paralysis, and muscle spasms. These can be caused by a range of ailments including myalgia, stroke, myopathy, strains, Bell's palsy, lacerations, contusions, infectious myositis, tears, atrophy, and neuromuscular diseases.
Understanding the depressor labii inferioris muscle and its functions can help in diagnosing and treating facial muscle disorders. Further research is needed to explore its full potential and implications in various facial expressions and actions.
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