MRCP UK EXAMINATIONS

Detailed explanation-1: -External Oblique-the most superficial and also the largest flat muscle of the abdominal wall. It runs in an inferior-medial direction and at the midline, its fibers form an aponeurosis and in the midline merge with the linea alba. This fibrous structure extends from the xiphoid process to the pubic symphysis.

Detailed explanation-2: -Internal abdominal oblique is a muscle found on the lateral side of the abdomen. It is broad and thin. it forms one of the layers of the lateral abdominal wall along with external oblique on the outer side and transverse abdominis on the inner side. Its fibers are obliquely oriented hence the name.

Detailed explanation-3: -Answer and Explanation: The muscle fibers that run inferomedially and at right angles to those of the internal oblique are those of the external oblique. The abdominal muscles consist of four main muscles which are the rectus abdominis, the transverse abdominis, and the external and internal obliques.

Detailed explanation-4: -Transversus Abdominis This is thinnest and deepest of the 3 anterolateral abdominal wall muscles. It originates from the lower 6 costal cartilages, lumbar vertebrae, iliac crests, and iliopsoas fascia. The fibers are oriented transversely and contribute to the rectus sheath medially.