BioScience Dictionary

A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z | Ot.

Found Brain 6 times.

Displaying results 1 to 10.

1. Brain (encephalon)
The center of the central nervous system ; a mass of nerve tissue in the cranium that receives and transmits neural impulses and controls and directs an organism's behavior and actions.

2. Brain death
A definition of death based on the absolute and total loss of the individual's brain function that is irreversible. This definition of death is a medical definition which may differ from religious, ethical, philosophical or cultural definitions of death. Modern anesthesia techniques can render a person without brain activities (flat EEG), totally paralyzed (with neuromuscular blocking agents), and with no cardiac (heart) activity (with cardioplegic solutions), such as is the case when a patient is undergoing extracorporeal circulation during cardiac anesthesia. In this case, despite that the patient physically resembles that of a dead person, the condition is reversible. Therefore, to declare brain death, one must follow a protocol of clinical testing as well as preclude anesthetic causes and hypothermia .

3. Brain scan
This is a technique to demonstrate the pattern of blood perfusion of the brain. The procedure involves intravenous injection of the radionuclide such as technetium 99m pertechnetate, mercury-210, or radioiodinated albumin . This method can diagnose cerebral hemorrhage, cerebrovascular accidents (CVA), tumor, hematoma , AV malformations, and aneurysm s.

4. Brain stem (brainstem)
The lowest part of the brain, which merges with the spinal cord. It consists of the medulla oblongata , midbrain and pons .

5. Brain stem
The portion of the brain that is continuous with the spinal cord and consists of the medulla oblongata and pons of the hindbrain and the midbrain.

6. Brain
The most anterior, most highly developed portion of the central nervous system .

View web definitions »

Learn more about Brain »