Use this PowerPoint to review Chapter 1, Section 1.6

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Use this PowerPoint to review Chapter 1, Section 1.6 Body Cavities Use this PowerPoint to review Chapter 1, Section 1.6

Body Cavities Figure 1.9a

Body Cavities Dorsal cavity protects the nervous system, and is divided into two subdivisions Cranial cavity is within the skull and encases the brain Vertebral cavity runs within the vertebral column and encases the spinal cord Ventral cavity houses the internal organs (viscera), and is divided into two subdivisions: - Thoracic and Abdominopelvic cavities

Body Cavities Figure 1.9b

Body Cavities Thoracic cavity is subdivided into pleural cavities, the mediastinum, and the pericardial cavity Pleural cavities – each houses a lung Mediastinum – contains the pericardial cavity, and surrounds the remaining thoracic organs Pericardial cavity – encloses the heart

Body Cavities 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

Ventral Body Cavity Membranes Parietal serosa lines internal body walls Visceral serosa covers the internal organs Serous fluid separates the serosae

Ventral Body Cavity Membranes Figure 1.10a

Ventral Body Cavity Membranes Figure 1.10b

Other Body Cavities Oral and digestive – mouth and cavities of the digestive organs Nasal –located within and posterior to the nose Orbital – house the eyes Middle ear – contain bones (ossicles) that transmit sound vibrations Synovial – joint cavities