Anatomical Positions, Directions, Cavities, Planes of the Human Body Chapter 1 Body Cavities & Membranes Slide 33-48

Body Cavities Body Cavities - Body cavities are spaces within the body that help protect, separate, and support internal organs. Dorsal Body Cavity Ventral Body Cavity

Abdominopelvic Cavity Ventral Body Cavity (Coelom) Provides protection, allows organ movement; lining prevents friction Dorsal Body Cavity Cushions and protects the CNS Abdominopelvic Cavity of abdomen and pelvis Contains the peritoneal cavity Cranial Cavity Contains brain Spinal Cavity Contains spinal cord

Body Cavities Spaces within the body that help protect, separate, and support internal organs Cranial cavity Thoracic cavity Abdominopelvic cavity Pelvic cavity

Body Cavities

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Cranial Cavity and Vertebral Canal Formed by the cranial bones Protects the brain Vertebral canal Formed by bones of vertebral column Contains the spinal cord Meninges [mi-nin-jeez] Layers of protective tissue that line the cranial cavity and vertebral canal

Thoracic Cavity Also called the chest cavity Formed by Ribs Muscles of the chest Sternum (breastbone) Vertebral column (thoracic portion)

Body Cavities and Membranes Dorsal body cavity Cavity subdivided into the cranial cavity and the vertebral cavity. Cranial cavity houses the brain. Vertebral cavity runs through the vertebral column and encloses the spinal cord

Body Cavities and Membranes Ventral body cavity – subdivided into: Thoracic cavity – divided into three parts Two lateral parts each containing a lung surrounded by a pleural cavity Mediastinum – contains the heart surrounded by the pericardial sac [mee-dee-a-stahy-nuh m] 

Body Cavities and Membranes Ventral body cavity Abdominopelvic cavity – divided into two parts Abdominal cavity – contains the liver, stomach, kidneys, and other organs Pelvic cavity – contains the bladder, some reproductive organs, and rectum

Thoracic Cavity Within the thoracic cavity Pericardial cavity Fluid-filled space that surround the heart Pleural cavity Two fluid-filled spaces that that surround each lung

Body Cavities and Membranes Serous cavities – a slit-like space lined by a serous membrane Pleura, pericardium, and peritoneum Parietal serosa – outer wall of the cavity Visceral serosa covers the visceral organs

Copyright 2009, John Wiley & Sons, Inc.

Ventral Body Cavity Membranes

Ventral Body Cavity Membranes