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.
lumbar puncture. noun. Medical Definition of lumbar puncture. : puncture of the subarachnoid space in the lumbar region of the spinal cord to withdraw cerebrospinal fluid or inject anesthetic drugsâcalled also spinal tap.