Definition: The term "extraclaustral" is often used in medical terminology to refer to a part of the body that lies outside the clavicle, which can be further divided into two parts - the superior and inferior pectoral muscles. The extraclaustrum is typically located between the upper and lower ribs, making it difficult for the patient to feel or move this area because of its position in the midline. In some cases, the extraclaustrum may also be referred