nenälihas

Nenälihas is a facial muscle located in the human body. It is one of the muscles that comprise the muscular layer of the face. The muscle is responsible for assisting in the movement of the nose and is also involved in the expression of emotions.

Nenälihas is a striated muscle, meaning it is composed of repeating units called sarcomeres that contract to produce movement. It is innervated by the facial nerve, also known as the seventh cranial nerve, which is responsible for controlling the muscles of facial expression.

The function of nenälihas is to enable the contraction and relaxation of the nose. When this muscle contracts, it raises the bridge of the nose and, to a lesser extent, causes the nostrils to flare. Relaxation of the muscle causes the opposite effect, lowering the bridge of the nose and reducing the size of the nostrils. The muscle plays a role in various facial expressions, including a person's emotional state.

Nenälihas is susceptible to atrophy, or wasting away, in individuals who display excessive frowning or wrinkling of the nose. This can be due to a variety of factors, including genetics, tobacco smoking, or other environmental factors. Maintaining a healthy and balanced facial expression through regular exercise or seeking professional help from a medical professional can help prevent the atrophy of this muscle. In some cases, the muscle may be weakened due to a peripheral neuropathy, a condition that affects the nerves that control facial movements. Treatment of the underlying condition may help alleviate the associated muscle weakness.

Overall, nenälihas plays an essential role in the expression of human emotions and is a significant part of the complex facial musculature.