Päälihasten

Päälihasten, also known as the temporalis muscle, is a small, triangular muscle located in the temporal region of the head. It is one of the muscles of mastication, which are responsible for movements of the jaw. The temporalis muscle originates from the temporal fossa of the skull and inserts into the coronoid process of the mandible. It is innervated by the mandibular branch of the trigeminal nerve (cranial nerve V).

The primary function of the temporalis muscle is to elevate the mandible, which is essential for activities such as chewing and speaking. It also contributes to lateral deviation of the mandible, aiding in the opening of the mouth. The temporalis muscle is a powerful muscle, and its contraction can be felt as a bulge on the side of the face.

The temporalis muscle is often involved in facial pain and temporomandibular joint (TMJ) disorders. Conditions such as temporomandibular joint dysfunction (TMD) can cause pain and discomfort in the temporal region, which may be referred from the temporalis muscle. Additionally, the temporalis muscle can be affected by bruxism, a condition characterized by involuntary grinding or clenching of the teeth.

In summary, the temporalis muscle is a crucial muscle in the head and neck region, playing a significant role in jaw movements and mastication. Its function and structure make it susceptible to various conditions, including TMJ disorders and bruxism. Understanding the anatomy and function of the temporalis muscle is essential for diagnosing and treating related conditions.