Elvis Presley, left, Natalie Wood and Nick Adams in 1956. The Rebel & the King is a sweetly naive account by the late actor Nick Adams about his friendship with a young Elvis Presley. Adams wrote the manuscript in the late 1950s when he was a rising star in Hollywood.
The thoracic cavity is separated from the abdominal cavity by the  diaphragm. This is a broad flat muscle.    (muscular) diaphragm The diaphragm is a muscle that separatâ¦e the thoracic from the abdominal cavity. The pelvis is the lowest part of the abdominal cavity and it has no physical separation from it    Diaphragm.
The thoracic cavity is open at the top and the abdominal cavity is open at the bottom. Both cavities are bound on the back by the spine. Even though their location is defined, the shape of these cavities can change.