brain stem


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brain stem,

lower part of the brainbrain,
the supervisory center of the nervous system in all vertebrates. It also serves as the site of emotions, memory, self-awareness, and thought. Anatomy and Function
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, adjoining and structurally continuous with the spinal cord. The upper segment of the human brain stem, the pons, contains nerve fibers that connect the two halves of the cerebellumcerebellum
, portion of the brain that coordinates movements of voluntary (skeletal) muscles. It contains about half of the brain's neurons, but these particular nerve cells are so small that the cerebellum accounts for only 10% of the brain's total weight.
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. It is vital in coordinating movements involving right and left sides of the body. Below the pons and continuous with the spinal cord is the medulla, which transmits ascending and descending nerve fibers between the spinal cord and the brain. The medulla also directly controls many involuntary muscular and glandular activities, including breathing, heart contraction, artery dilation, salivation, vomiting, and probably laughing. The nuclei of some of the nerves that originate in the brain are also located in the brain stem. Nerve fibers in the brain stem do not readily regenerate, hence injury may result in permanent loss of function. See also nervous systemnervous system,
network of specialized tissue that controls actions and reactions of the body and its adjustment to the environment. Virtually all members of the animal kingdom have at least a rudimentary nervous system.
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References in periodicals archive ?
These cells are a type of brain stem cell important for maintaining normal brain function, and for the regeneration of myelin a fatty sheath that surrounds our nerves, which is damaged in multiple sclerosis (MS).
These cells are a type of brain stem cell important for maintaining normal brain function, and for the regeneration of myelin - the fatty sheath that surrounds our nerves, which is damaged in multiple sclerosis (MS).
"If it's a severe abnormality where there is no cochlear or nerve at all, the patient will be referred to an expert neurosurgeon and they will carry out a brain stem implant," says Dr Kassouma.
The diagnostic evaluation of the traumatic brain stem hemorrhage is quite challenging.
Here, the researchers based their work on the observation that the decline in aging brain stem cells appears to be closely associated with increased levels of inflammatory signaling molecules, or cytokines.
Only 39% participants were found aware about the fact that brain stem death and Coma are different; however, among those very few could tell the exact difference between coma and brain stem death.
* BRAIN STEM I When opioids bind to receptors in the brain stem, breathing slows down, which creates a feeling of relaxation.
"My husband had endured a massive brain stem stroke and every minute untreated meant another minute where his brain was starved of oxygen.
Brain stem cells from middle-aged mice (9 months old) no longer divided as often as ones from 1.5-month-old mice did, the team found.
All brain stem reflexes were absent mimicking brain death.
My husband recently had a double bypass at the Liverpool Heart and Chest Hospital, an operation which went quite well but, unfortunately, was followed by my husband suffering a very bad brain stem stroke.