Direction of the needle bevel and epidural anesthetic spread.
D000328:Adult; D000368:Aged; D000375:Aging; D000767:Anesthesia, Epidural / Q000295:instrumentation*; D004837:Epinephrine; D006801:Humans; D008012:Lidocaine; D008297:Male; D008875:Middle Aged; D009339:Needles
D008012:Lidocaine; D004837:Epinephrine