Question at position 56 Which of the following statements about the spinal cord is TRUE?The central canal of the spinal cord is filled with blood.The anterior median fissure is shallower than the posterior median sulcus.The spinal dura mater consists of multiple layers and is directly attached to the vertebral column.The subarachnoid space inferior to the spinal cord's end is used for spinal taps because of reduced risk of cord damage.

Question

BlackTom AI · Accepted Answer

Let’s break down each statement about the spinal cord to evaluate its truthfulness. 
Option 1: 'The central canal of the spinal cord is filled with blood.' In reality, the central canal contains cerebrospinal fluid, not blood, so this claim is incorrect. 
Option 2: 'The anterior median fissure is shallower than the posterior median sulcus.' The anterior median fissure is actually deeper (more prominent) than the posterior median sulcus; describing it as shallower is false. 
Option 3: 'The spinal dura mater consists of multiple layers and is directly attached to the vertebral column.' The spinal dura mater is a single outer layer of dura with potential dural reflections, but it is not directly attached along the entire length to the vertebral column; it forms a dural sac with a potential epidural space between the dura and vertebrae. Therefore, this statement is inaccurate. 
Option 4: 'The subarachnoid space inferior to the spinal cord's end is used for spinal taps because of reduced risk of cord damage.' This is true: spinal taps (lumbar punctures) are performed below the conus medullaris, where the subarachnoid space contains CSF but there is no spinal cord, reducing the risk of cord injury. 
In summary, options 1–3 contain factual inaccuracies about anatomy, while option 4 correctly describes the anatomical rationale for performing spinal taps in that region.

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