Shape of the abdominal wall
Fig. 1: Normal state
Fig. 2: Increase of subcutaneous fat tissue of the abdominal wall tends to enlarge the lower part of the abdomen.
Fig. 3: Increase of intra-abdominal fat issue enlarges predominately its central part.
Fig. 4: Ventral inclination leads to the protrusion of the abdominal wall.
Fig. 5: Expiration and backwards shifting of the lumbar vertebrae move the abdominal content ventrally.
Fig. 6: Inspiration and forward shifting of the lumbar vertebrae move the abdominal wall towards the thoracic cavity.