Some other fun facts about the construction of the Mackinac Bridge. The annual Mackinac Bridge Walk is held every year on Labor Day. Two lanes of traffic are closed and 50-80,000 people, all led by the Governor of Michigan walk together over the bridge.
A lumbar puncture (also called a spinal tap) is a procedure to collect and look at the fluid (cerebrospinal fluid, or CSF) surrounding the brain and spinal cord. During a lumbar puncture, a needle is carefully inserted into the spinal canal low in the back (lumbar area). Samples of CSF are collected.
1 A syringe is attached to the spinal needle to draw out the fluid. The fluid can also be allowed to drip into a collection tube.  A lumbar tap (also called lumbar puncture) is performed in the lower back of a patient. The area is shaved and sterilized, and a spinal needle is inserted.