THORAX ABDOMEN AND PELVIS

Detailed explanation-1: -The diaphragm is a thin dome-shaped muscle which separates the thoracic cavity (lungs and heart) from the abdominal cavity (intestines, stomach, liver, etc.). It is involved in respiration, drawing downward in the chest on inhalation, and pushing upward in exhalation.

Detailed explanation-2: -The ventral cavity, in humans, is actually made up of two separate cavities, separated by the diaphragm, a thin muscle which helps control the expansion and contraction of the lungs. The ventral cavity is sometimes referred to as a coelom, or true body cavity.

Detailed explanation-3: -The diaphragm separates the abdominal and thoracic cavities but does allow certain structures to pass through via its three openings: The inferior vena cava passes through the diaphragm at the vena caval foramen.

Detailed explanation-4: -The diaphragm is shaped as two domes, with the right dome positioned slightly higher than the left because of the liver. The depression between the two domes is due to the pericardium slightly depressing the diaphragm. The diaphragm has two surfaces: thoracic and abdominal.

Detailed explanation-5: -The diaphragm has a dome-like structure with the peripheral segment attached to the chest wall and abdominal cavity. The muscle fibers from these attachments converge in a central tendon, which forms the crest of the dome.