Um, Letâs Rethink That Salute (1930s) Again, in his book To the Flag: The Unlikely History of the Pledge of Allegiance, Richard J. Ellis explains that by the mid-1930s, Americans had begun to notice eerie similarities between the Bellamy salute and the âHeil Hitlerâ salute.
A lumbar puncture may be used to collect a sample of cerebrospinal fluid in order to detect the presence of certain types of cancer or infection. Lumbar punctures may also be used to inject medications, such as spinal anesthesia or chemotherapy drugs.
lumbar puncture Passage of a needle between two vertebrae of the spine, from behind, into the fluid-filled space lying below the termination of the spinal cord. Lumbar puncture is usually done to obtain a sample of cerebrospinal fluid for laboratory examination in the investigation of disorders of the nervous system.