Rectus Abdominis Muscle Beneath the Skin, Lateral View

Description

Seen in lateral profile beneath the skin, the rectus abdominis runs vertically from the pubic crest and pubic symphysis toward the costal cartilages of ribs 5 to 7 and the xiphoid process, its tendinous intersections producing the familiar six-pack segmentation. Anterior to the abdominal viscera and medial to the lateral abdominal wall, it sits within the rectus sheath formed by the aponeuroses of external oblique, internal oblique, and transversus abdominis, which wrap from lateral to medial to meet at the linea alba. Superiorly, the lower rib cage and intercostal musculature frame the thoracoabdominal junction, while posterior-laterally the latissimus dorsi and, more anteriorly, the deltoid establish the shoulder girdle context. Lateral viewing is where the rectus sheath architecture becomes easiest to teach: you can follow how each aponeurosis changes planes as it approaches the semilunar line, and how that relationship shifts around the arcuate line where the posterior sheath thins. A key surgical landmark. This matters in ventral and incisional hernia repair, where mesh placement and closure strategy depend on the integrity of the anterior versus posterior sheath layers, and in understanding rectus diastasis where the linea alba widens without a true fascial defect. Ideal for gross anatomy lab teaching on the anterolateral abdominal wall, surgical education modules on component separation and abdominal wall reconstruction, and medical publishing figures discussing the rectus sheath, semilunar line, and common hernia planes in adult male anatomy. Anatomical accuracy verified by SciePro's Medical Advisory Board.