NEET PG DENTAL EXAM

Detailed explanation-1: -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: -A spinal tap is a common procedure that takes about 30 minutes or less. 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-3: -Lumbar puncture can occur in the L3-L4, L4-L5, or L5-S1 interspace.

Detailed explanation-4: -The insertion of a needle under local anaesthetic requires careful positioning to prevent injury to the spinal cord. Since the spinal cord ends as a solid structure around the level of the second lumbar vertebra (L2) the insertion of a needle must be below this point, usually between L3 and L4 (Fig 2).