👉 In physical sciences, a pectoris is a type of muscle that is involved in the movement and support of the upper arm. It helps with posture and balance, as well as providing strength and flexibility to the arm muscles. Pectoralis major (upper trapezius) and pectoralis minor (lower trapezius) are two main types of pectoris. The pectoralis major is located on the upper part of the humerus bone and is responsible for movement in
