transversalis fascia and transversus abdominis aponeurosis
The transversalis fascia and transversus abdominis aponeurosis are two layers of tissue in the abdominal wall.
The transversalis fascia is a thin layer of connective tissue that lies deep to the transversus abdominis muscle. It is a continuation of the endoabdominal fascia, which lines the inside of the abdominal cavity, and provides support and protection to the organs within the abdomen. It also helps to anchor the transversus abdominis muscle in place.
The transversus abdominis aponeurosis, also known as the transverse fascia, is a broad, sheet-like tendon that forms the anterior portion of the transversus abdominis muscle. It originates from the lower ribs and the lumbar vertebrae, and inserts into the linea alba (a fibrous band that runs down the midline of the abdomen) and the pubic crest. The transversus abdominis aponeurosis acts as a strong, supportive structure that helps to stabilize the abdominal wall and maintain the shape and integrity of the abdomen. It also connects with other structures in the abdominal wall, such as the rectus abdominis muscle and the internal oblique muscle.