#spinal_anesthesia__spinal_anaesthesia__spinal  anesthesia of the lower half of the body; caused by injury to the spinal cord or by injecting an anesthetic beneath the arachnoid membrane that surrounds the spinal cord
  supertype:  #regional_anesthesia__regional_anaesthesia  loss of sensation in a region of the body produced by application of an anesthetic agent to all the nerves supplying that region (as when an epidural anesthetic is administered to the pelvic region during childbirth)
  subtype:  #saddle_block_anesthesia__saddle_block_anaesthesia  the parts of a patient's body that would touch a saddle if the patient were sitting in one are anesthetized by injecting a local anesthetic into the spinal cord

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