While doing a lumbar puncture in an infant you choose a lower inter-veebral space than in an adult. Choose the TRUE reason.
Though the first option is true it is not the answer to the question. The spinal cord extends to the lower border of L3 in infants that is why we opt for a lower inter-veebral space in infants while doing a lumbar puncture. The dura, subdural space and subarachnoid space extends up to S2. The pia mater extends to the tip of coccyx. Ref: Inderbir Singh Neuroanatomy, 6th Edition, Page 37; Lee-Mc Gregor's Synopsis of Surgical Anatomy, 12th Edition, Page 342, 346.
The spinal cord extends up to lower border of L1 in an adult
The spinal cord extends up to the lower border of L3 in an infant
The spinal cord extends up to the upper border of L3 in an infant
The spinal cord extends up to the upper border of L2 in an infant