Pectoral

Pectoral refers to the chest area of the body. It is derived from the Latin word 'pectus' which means 'chest'. The term is commonly used in anatomy to refer to the muscles in the chest area, specifically the Pectoralis major and the Pectoralis minor.

Anatomy

The pectoral region is located on the anterior chest wall. It is made up of two muscles: the Pectoralis major and the Pectoralis minor.

Pectoralis Major

The Pectoralis major is a thick, fan-shaped muscle that makes up the bulk of the chest muscles. It originates from the clavicle (collar bone), the sternum (breast bone), the ribs, and the fascia covering the external oblique muscle. The fibers converge to insert at the humerus (upper arm bone). It is responsible for the movement of the shoulder joint.

Pectoralis Minor

The Pectoralis minor is a thin, triangular muscle located beneath the Pectoralis major. It originates from the third, fourth, and fifth ribs and inserts at the scapula (shoulder blade). It aids in the movement of the scapula.

Function

The pectoral muscles play a key role in the movement and stability of the shoulder joint. The Pectoralis major helps in the flexion, adduction, and medial rotation of the humerus, thus enabling the arm to move across the body. The Pectoralis minor helps in stabilizing the scapula.

Clinical Significance

Injuries to the pectoral muscles are relatively rare but can occur due to excessive strain or direct trauma. Such injuries can result in pain, swelling, and limited range of motion. Treatment usually involves rest, physical therapy, and in severe cases, surgery.