Keeping the position of the 29-gauge spinal needle.
Tunstall
M E
ME
D000773:Anesthesia, Obstetrical / Q000295:instrumentation; D000775:Anesthesia, Spinal / Q000295:instrumentation*; D005260:Female; D006261:Headache / Q000517:prevention & control; D006801:Humans; D011247:Pregnancy; D013129:Spinal Puncture / Q000295:instrumentation*