Images Dated 19th January 2000

Artwork of brain depicting Parkinsons disease

Parkinson's disease. Illustration of the brain, depicting the neurological disorder of Parkinson's disease. A coronal section through the brain is seen, with two elderly figures in a bent posture superimposed. Parkinson's disease is caused by a degeneration of nerve tissue within the basal ganglia (pink areas, at centre) of the brain. As a result, nerve pathways down the spinal cord are altered. Contracted muscle is prevented from relaxing, causing tremor, joint rigidity, and slow movement. Parkinson's disease affects the elderly. It progresses from a slight hand tremor, to an unbalanced, bent-over, shuffling walk. Treatment includes dopamine drugs. There is no cure

© JOHN BAVOSI/SCIENCE PHOTO LIBRARY

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Young black bear (Ursus americanus), one and a half years old, in captivity, among arrowleaf balsam root, Animals of Montana, Bozeman, Montana, United States of America, North America

© James Hager

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Blackheaded heron (Ardea melanocephala)

Blackheaded heron (Ardea melanocephala), among spring flowers, West Coast National Park, Western Cape, South Africa, Africa

© Robert Harding 2008 - All Rights Reserved

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