Rectus Abdominis Muscle

Description

Running vertically on the anterior abdominal wall, the paired rectus abdominis muscles extend from the pubic crest and pubic symphysis inferiorly to the xiphoid process and costal cartilages of ribs 5 to 7 superiorly. Tendinous intersections segment the muscle bellies, while the linea alba lies on the midline and separates right from left; laterally, the semilunar line marks the transition into the aponeuroses of the external oblique, internal oblique, and transversus abdominis forming the rectus sheath. Superiorly the ribcage frames the upper attachments, and posterior to the abdominal wall the thoracic and lumbar vertebrae provide a fixed reference for orientation. Clear landmarks. This anterior torso emphasis matters because the rectus sheath and its contents are where clinicians work and where pathology declares itself. Surgical approaches such as midline laparotomy and paramedian incisions rely on recognizing the linea alba, semilunar line, and the inferior limit of the posterior rectus sheath at the arcuate line, a level that also changes the pattern of rectus sheath hematoma after trauma or anticoagulation. The same anatomy underpins ventral and umbilical hernias, and helps explain why diastasis recti widens the linea alba while leaving the rectus muscle bellies intact. Use this asset for gross anatomy teaching on the abdominal wall, for operative atlases covering abdominal incisions and hernia repair, and for patient-facing education in sports medicine or physiotherapy discussing trunk flexion mechanics and core weakness patterns in men. Anatomical accuracy verified by SciePro's Medical Advisory Board.