1. Body Cavities

2.  The body is not a solid structure  Made up of open spaces (cavities) that contain well-ordered, compact arrangements of internal organs  Two main cavities, which are labeled by location ◦ These are broken into smaller cavities, which are labeled by content

3.  Ventral cavity – cavities along the ventral surface of the body  Dorsal cavity – cavities along dorsal surface of the body

4.  Thoracic cavity ◦ Mediastinum ◦ Pleural cavities (right and left)  Abdominopelvic cavity ◦ Abdominal cavity ◦ Pelvic cavity  Separated by the diaphragm ◦ Large, dome-shaped muscle ◦ Most essential muscle in breathing

5.  Cranial cavity  Spinal cavity

6.  A.K.A. “Chest cavity”  Subdivisions: ◦ Mediastinum  Trachea  Esophagus  Heart  Blood vessels ◦ Pleural cavities  Lungs

7.  Not separated by a physical structure  Subdivisions: ◦ Abdominal cavity ◦ Pelvic cavity

8.  Includes: ◦ Liver ◦ Gallbladder ◦ Stomach ◦ Spleen ◦ Pancreas ◦ Small Intestine ◦ Parts of large intestine ◦ Kidneys

9.  Includes: ◦ Lower large intestine (sigmoid colon) - A ◦ Rectum - H ◦ Urinary bladder - B ◦ Reproductive organs

10.  Includes: ◦ Brain and surrounding structures ◦ CSF

11.  Includes: ◦ Spinal Cord ◦ CSF