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| | viscera of ventral cavity (Site not responding. Last check: 2007-10-26) |
 | | In anatomical position, the body is upright, facing the observer with the arms placed at the sidesm and the palms facing out with the thumbs pointed away from the body. |
 | | It can be subdivided into the cranial cavity, which consists of the cranial bones and the brain, and the vertebral cavity, which is formed by the vertebrae of the backbone, the spinal cord, and spinal roots. |
 | | A radioactive substance is injected into the body, and the positrons of this substance collide with negatively charged ions in body tissues, causing gamma rays to be realeased. |
| pbl.cc.gatech.edu /mindy/323 (3427 words) |
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