Contain the visceral organs Body Cavities Contain the visceral organs

Axial portion Head Neck Trunk

Appendicular portion Arms Legs

Dorsal c. Axial cavity divided: Cranial: skull, brain Spinal: spinal cord

Ventral c. Thoracic: above the diaphragm Abdominopelvic: below diaphragm to floor of pelvis

Abdominopelvic Abdominal: stomach, liver, gall bladder, spleen, small intestine, and most of the large intestine

Pelvic: end of large intestine, urinary bladder, internal reproductive organs.

Smaller cavities within the head Oral: teeth, tongue Nasal: paranasal sinuses, right and left divided by the septum

Middle ear: middle ear bones Orbital: eyes, associated skeletal muscles and nerves

Pleural membranes: associated with the lung Parietal pleura: line the lung compartments

Visceral pleura: membrane covering the lung Pleural cavity: space between the pleura

Serous fluid: substance within the pleural cavity Mediastinum: portion of thoracic cavity separating the heart, esophagus, trachea, and thymus from the lungs.

Pericardial membranes: Visceral pericardium: membranes surrounding the heart Parietal pericardium: second layer, more fibrous

Abdominal cavity: peritoneal membranes Pericardial cavity: space between Abdominal cavity: peritoneal membranes Parietal peritoneum: lines the walls of the cavity

Visceral peritoneum: covers the internal organs Peritoneal cavity: space between