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vb, taps, tapping or tapped. 1. to strike (something) lightly and usually repeatedly: to tap the table; to tap on the table. 2. (tr) to produce by striking in this way: to tap a rhythm. 3. (tr) to strike lightly with (something): to tap one's finger on the desk.
There are two different types of spinal taps: a cisternal tap and a lumbar tap. To perform a cisternal tap, the back top of the neck is shaved and sterilized. A spinal needle is inserted at the base of the skull, and into the spinal column, penetrating the dura mater and arachnoid membranes to the subarachnoid space.