GENERAL HISTOLOGY

Detailed explanation-1: -The lumbar spinous processes of L3, L4, and L5, and the interspaces between, can usually be directly identified by palpation. The spinal needle can be safely inserted into the subarachnoid space at the L3-4 or L4-5 interspace, since this is well below the termination of the spinal cord in most patients.

Detailed explanation-2: -The ideal insertion point of the spinal needle should be either in the interspinous area between L4 and L5 or L3 and L4. Using these landmarks will avoid inadvertent damage to the conus medullaris, which typically terminates at L1.

Detailed explanation-3: -It’s performed in your lower back, in the lumbar region. During a lumbar puncture, a needle is inserted into the space between two lumbar bones (vertebrae) to remove a sample of cerebrospinal fluid. This is the fluid that surrounds your brain and spinal cord to protect them from injury.

Detailed explanation-4: -The spinal cord extends from the lower part of the brain down to the upper lumbar area. A spinal tap is done in the lower lumbar area, below the point where the spinal cord ends. So, the risk of harming the spinal cord is avoided.

Detailed explanation-5: -A lumbar puncture is generally a safe procedure and serious side effects are uncommon. The most common side effects are: headaches, which can last for up to a week – you’ll be given painkillers at the hospital if you need them.