Ventral Body Cavity (cont.) • Thoracic cavity – Two pleural cavities • Each cavity surrounds one lung – Mediastinum • Contains pericardial cavity • Surrounds other thoracic organs, such as esophagus, trachea, etc. – Pericardial cavity • Encloses heart
Ventral Body Cavity (cont.) • Abdominopelvic cavity – Abdominal cavity • Contains stomach, intestines, spleen, and liver – Pelvic cavity • Contains urinary bladder, reproductive organs, and rectum
Figure 1.9 Dorsal and ventral body cavities and their subdivisions. Cranial cavity (contains brain) Cranial cavity Vertebral cavity Dorsal body cavity Superior mediastinum Pleural cavity Pericardial cavity within the mediastinum Ventral body cavity (thoracic and abdomino- pelvic cavities) Thoracic cavity (contains heart and lungs) Vertebral cavity (contains spinal cord) Diaphragm Abdominal cavity (contains digestive viscera) Pelvic cavity (contains urinary bladder, reproductive organs, and rectum) Lateral view Anterior view Abdomino- pelvic cavity Dorsal body cavity Ventral body cavity
Clinical – Homeostatic Imbalance 1.1 • Whereas the pelvic bones provide limited protection to the pelvic cavity, the walls of abdominal cavity are formed by muscle only, so organs in this area are most vulnerable to trauma
Ventral Body Cavity (cont.) • Membranes in ventral body cavity – Serosa (also called serous membrane ) • Thin, double-layered membranes that cover surfaces in ventral body cavity – Parietal serosa lines internal body cavity walls – Visceral serosa covers internal organs (viscera) • Double layers are separated by slit-like cavity filled with serous fluid • Fluid secreted by both layers of membrane
Ventral Body Cavity (cont.) • Named for specific cavity and organs that they are associated with – Pericardium • Heart – Pleurae • Lungs – Peritoneum • Abdominopelvic cavity
Figure 1.10 Serous membrane relationships. Outer balloon wall (comparable to parietal serosa) Air (comparable to serous cavity) Inner balloon wall (comparable to visceral serosa) A fist thrust into a flaccid balloon demonstrates the relationship between the parietal and visceral serous membrane layers.
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