Final answer:
The serratus anterior is a strong scapula muscle that positions and stabilizes the scapula. It originates on the ribs and inserts onto the scapula. When contracted, it pulls the scapula forward and aids in shoulder rotation.
Step-by-step explanation:
The serratus anterior is a very strong scapula muscle that plays an important role in positioning and stabilizing the scapula. It is located on the anterior (front) side of the thorax and originates on the ribs, inserting onto the scapula. When the serratus anterior contracts, it pulls the scapula forward and helps rotate the shoulder.