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arachnid |
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arachnid) The scorpion belongs to an ancient group of animals. Scorpions were perhaps the first arachnids to adapt to life on land, some 400 million years ago. There are about 800 species known today. Type of arthropod of the class Arachnida, including spiders, scorpions, ticks, and mites. They differ from insects in possessing only two main body regions, the cephalothorax and the abdomen, and in having eight legs. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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| Occasionally, MRI has difficulty distinguishing an epidermoid from an arachnoid cyst; this problem can be overcome with a fluid-attenuated inversion recovery (FLAIR) MRI when an epidermoid is hyperintense. says Wendy Robbins (pictured, left) of the Tingler, the arachnoid, 10-pronged, copper head massager she created with partner Jorli McLain (right). 15,18,19) They originate in the tissues that surround the brain and spinal cord, specifically in the arachnoid granulations. |
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arachnoid
