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BODY CAVITIES: What do we know? What are Cavities? Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings DORSAL VS VENTRAL What does each mean? Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings Body Cavities Dorsal cavity –Along the back- protects the nervous system, and is divided into two subdivisions Cranial cavity – within the skull; encases the brain Vertebral cavity – runs within the vertebral column; encases the spinal cord Ventral cavity- Along the belly- houses the internal organs (viscera), and is divided into two subdivisions Thoracic- Heart and Lungs Abdominopelvic- Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings Body Cavities Cranial cavity (contains brain) Thoracic cavity (contains heart and lungs) Dorsal body cavity Vertebral cavity (contains spinal cord) Key: Ventral body cavity Abdominal cavity (thoracic (contains digestive and viscera) abdominoPelvic cavity pelvic (contains bladder, cavities) Diaphragm Dorsal body cavity Ventral body cavity (a) Lateral view Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings reproductive organs, and rectum) Figure 1.9a Body Cavities – thoracic cavity Thoracic cavity is subdivided into two pleural cavities, the mediastinum, and the pericardial cavity Pleural cavities – each houses a lung Mediastinum – contains the pericardial cavity; surrounds the remaining thoracic organs Pericardial cavity – encloses the heart Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings Body Cavities Cranial cavity Vertebral cavity Thoracic cavity (contains heart and lungs) Superior mediastinum Pleural cavity Pericardial cavity within the mediastinum Abdominopelvic Cavity Key: Dorsal body cavity Ventral body cavity (b) Anterior view Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings Figure 1.9b Body Cavities – abdominopelvic cavity The abdominopelvic cavity is separated from the superior thoracic cavity by the dome-shaped diaphragm It is composed of two subdivisions Abdominal cavity – contains the stomach, intestines, spleen, liver, and other organs Pelvic cavity – lies within the pelvis and contains the bladder, reproductive organs, and rectum Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings Body Cavities Cranial cavity Vertebral cavity Diaphragm Abdominal cavity (contains digestive viscera) Key: Dorsal body cavity Ventral body cavity Abdomino-pelvic cavity Pelvic cavity (contains bladder, reproductive organs, and rectum) (b) Anterior view Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings Figure 1.9b Abdominopelvic Quadrants Right upper Left upper Right lower Left lower Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings Figure 1.12 What is in the UPPER QUADRANTS: Left upper quadrant the left portion of the liver, the larger portion of the stomach, the pancreas, left kidney, spleen, portions of the transverse and descending colon, and parts of the small intestine. Right upper quadrant right portion of the liver, the gallbladder, right kidney, a small portion of the stomach, portions of the ascending and transverse colon, and parts of small intestine. Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings What is in the Lower Quadrants Left lower quadrant majority of the small intestine, some of the large intestine, the left reproductive organs, and the left ureter. Right lower quadrant The cecum, appendix, part of the small intestines, the right reproductive organs, and the right ureter. Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings TICKET OUT USING SCRATCH PAPER: Summarize what you learned today in your own words. Identify main topics discussed. What did you understand today and what is still troubling you? Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings