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Teres Major

Teres major is a thick and oval-shaped muscle that lies in the upper arm. Although having similar names, Teres major is different in terms of actions and innervation when compared to the teres minor. It’s main function is to facilitate medial rotation of the arm and it

Muscles of Thorax

Internal Intercostalis Muscle The internal intercostal muscles are a set of skeletal muscles and are located between the ribs. There are eleven muscles on each side. Among the cartilages of the true ribs they begin anteriorly at the sternum in the intercostal spaces, as well as at the anterior extremities

Pectoralis Major

The pectoralis major is a large, broad, fan-shaped muscle located on the front side of the thorax. It is the biggest muscle of the pectoral region. It travels across the front of the underarm, where it stays thick, and afterwards connects to its slim, square tendon of

Serratus Anterior

The serratus anterior is a wide sheet of muscle that envelops the side wall of the thorax. Therefore, it is not a muscle of the pectoral area. But for benefit, it is explained with the muscles of pectoral area. Origin It emerges by a series of 8


The sternalis is a long thin muscle which expands via the sternocleidomastoid to the rectus abdominis accompanying the sternum. Compared to bilateral variant the sternalis is occurs twice as unilateral variant and develops the same in male and female patients. The muscle is superficial and medial towards

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