Boundaries of the rectus sheath- Master!!! скачать в хорошем качестве

Boundaries of the rectus sheath- Master!!!

The rectus sheath is a fibrous covering that encloses the rectus abdominis and pyramidalis muscles of the anterior abdominal wall. It is formed by the aponeuroses of the three flat abdominal muscles: the external oblique, internal oblique, and transversus abdominis. Components: Anterior wall: Formed by the external oblique aponeurosis and part of the internal oblique aponeurosis (above the arcuate line). Posterior wall: Formed by the internal oblique aponeurosis and the transversus abdominis aponeurosis (above the arcuate line). Below the arcuate line: All aponeuroses pass anterior to the rectus muscle, leaving only the transversalis fascia posteriorly. Contents of the Rectus Sheath: Rectus abdominis muscle Pyramidalis muscle (when present) Superior and inferior epigastric vessels Terminal parts of lower intercostal nerves (T7–T12) Lymphatic vessels Clinical relevance: Important in surgical procedures (e.g., incisions for laparotomy). The arcuate line is a key landmark as it marks the transition where the posterior wall of the sheath ends.