The posterior serratus muscle, also known as the serratus posterior superior muscle, is a thin and flat muscle located on the backside of the upper thoracic region. It is one of the muscles that make up the deep layer of the intrinsic back muscles.
This muscle originates from the spinous processes of the lower cervical vertebrae (C7 - T3) and inserts onto the ribs 2-5. Its fibers run obliquely downward and laterally, providing a fan-like appearance.
The main function of the posterior serratus muscle is to assist in the elevation of the ribs during inspiration. When contracting, it helps in expanding the thoracic cavity and aids in the inhalation process. It also plays a role in stabilizing and supporting the thoracic spine in conjunction with other muscles in the back.
In terms of clinical significance, dysfunction or injury to the posterior serratus muscle may result in pain, discomfort, or limited mobility in the upper back or thoracic region. Such conditions may arise due to overuse, strain, or trauma. Treatment options for posterior serratus muscle issues often involve rest, targeted exercises, physical therapy, or, in severe cases, surgery.
Overall, the posterior serratus muscle plays an important role in the respiratory function of the body, aiding in inhalation and contributing to the stability of the thoracic spine.
