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Muscles

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

Subcostalis Muscle

The Subcostales/Infracostales consist of muscular as well as aponeurotic fasciculi, which are generally only well-built within the lower portion of the thorax. Each one emerges via the inner surface of one rib, and is attached near its angle within the inner surface of the second or third

Transversus Thoracis Muscles

The transversus thoracis muscles are on the same level as the innermost intercostals and are located in the deep surface of the anterior thoracic wall. Origin The transversus thoracis muscles emerge from: The posterior side of the xiphoid process. The inferior portion of the sternum. The adjacent

Endothoracic Fascia

The structures in the mediastinum are covered by loose connective tissue and it also lines the internal surface of the thoracic cavity. In order to form definite fibrous layers, it is condensed within certain areas. A continuous fibro-elastic membrane known as the endothoracic fascia is created by

Innermost Intercostal Muscles

Deepest intercostal muscles situated within the intercostal spaces are the Innermost intercostal muscles. Together with the internal intercostal muscles they constrict at the time of expiration in order to minimize the transverse area of the thoracic cavity. Origin Just above the costal groove, the innermost intercostal muscle

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