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Explore the different body cavities (axial and appendicular portions) and the organs they contain, such as the head, neck, trunk, arms, and legs. Learn about the divisions within the axial cavity (dorsal, cranial, spinal) and ventral cavity (thoracic, abdominopelvic), as well as the smaller cavities in the head. Discover the membranes (pleural, pericardial, peritoneal) and their roles in protecting the organs.
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Body Cavities Contain the visceral organs
Axial portion • Head • Neck • Trunk
Appendicular portion • Arms • Legs
Axial cavity divided: • Dorsal c. • 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
Membranes • 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
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