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Sternalis muscle
The sternalis muscle is an anatomical variant that lies in front of the sternal end of the pectoralis major parallel to the margin of the sternum. The sternalis muscle may be a variation of the pectoralis major or of the rectus abdominis. It is insufficiently mentioned in standard anatomy textbooks.
== Structure ==
The sternalis is a muscle that runs along the anterior aspect of the body of the sternum. It lies superficially and parallel to the sternum. Its origin and insertion are variable. The sternalis muscle often originates from the upper part of the sternum and can display varying insertions such as the pectoral fascia, lower ribs, costal cartilages, rectus sheath, aponeurosis of the abdominal external oblique muscle. There is still a great deal of disagreement about its innervation and its embryonic origin.〔
In a review, it was reported that the muscle was innervated by the external or internal thoracic nerves in 55% of the cases, by the intercostal nerves in 43% of the cases, while the remaining cases were supplied by both nerves.〔 However, innervation by the pectoral nerves has also been reported. This appears to indicate that the sternalis is not always derived from the same embryonic origin.〔Harper WF. The sternalis muscle in the anencephalous foetus. Anat Notes 1936;317-20.〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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