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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

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

The Pectoral Region – Muscles

The muscles of the Pectoral Region are: Pectoralis major Pectoralis minor Subclavius Serratus anterior Muscles of the Pectoral Region The Pectoral region is the one located on the anterior chest wall. Pectoralis Major Pectoralis major is the largest muscle of the pectoral region. Origin Pectoralis major muscle

Lower Esophageal Sphincter (Gastroesophageal Sphincter)

Sphincters protect the esophagus at both terminations. The upper esophageal sphincter is the pharyngoesophageal sphincter, and the lower esophageal sphincter is the gastroesophageal sphincter. A sphincter is a ring-like muscular structure that, whenever closed, stops the passage via the tube that it is protecting. The lower portion

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