MCQ IN MEDICINE

Detailed explanation-1: -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-2: -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.