椎管内麻醉(动画)
http://player.youku.com/player.php/sid/XNzIzOTk2MzY===.html This 3d medical animation shows spinal and epidural anesthesia procedures performed on a female. A needle is shown piercing the dura mater covering the spinal cord, injecting anesthetic into the thecal sac. The needle is withdrawn from the sac, and more anesthetic is injected into the extradural space.
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