There are 2 main cavities: the dorsal and the ventral cavity.
The dorsal is subdivided in: cranial cavity and vertebral cavity.
The dorsal cavity is limited by cranial bones and vertebras. This cavity is associated with three membranes- the meninges -the pia mater, arachnoid, and dura mater. This cavity contains the brain and the spinal cord.
The ventral cavity can be subdivided into the thoracic cavity and the abdominopelvic cavity.
The ventral cavity is limited by thoracic and abdominal muscles and bones.
This sub-cavities are separated by the diaphragm.
The thoracic cavity can be subdivided into the pleural cavity and the mediastinum.
The pleural cavity is limited by the pleural membrane( parietal pleura+ visceral pleura) which we can say that it's the surface of the lungs ( also included in this cavity).
The mediastinum contains major arteries and veins, part of the trachea, part of the esophagus, the heart and it's the pericardium(visceral+parietal) that surrounds the heart, so we they are "the surface of the heart".
The abdominopelvic cavity is also subdivided into the abdominal cavity and the pelvic cavity.
It's laterally limited by abdominal muscles.
It's associated with a serous membrane that covers the surface of the organs: the peritoneum.
It contains stomach, the liver, the spleen, the intestines, the kidneys and the pancreas.
The pelvic cavity doesn't have a physical separation of the abdominal cavity and is divided only by an imaginary plan.
Inferiorly is limited by the pelvic diaphragm.
It contains the bladder and genitals.
In between the visceral, the inner layer that covers the organs, and parietal layers of the ventral cavity there is serous fluid that allows them to slide freely over each other. So we can say that these serous membranes are found in any ventral wall.
