____________________ and the __________________ are extensions of pia mater.

Question

BlackTom AI · Accepted Answer

The prompt asks us to identify what phrase completes the sentence: '____________________ and the __________________ are extensions of pia mater.'
Option 1: 'Subdural space; filum terminale' — The subdural space is a potential space between dura mater and arachnoid mater, not an extension of pia mater. The filum terminale is indeed a structure associated with pia mater, but this pairing is mismatched for the first blank, making this option incorrect.
Option 2: 'Denticulate ligaments; cauda equina' — The denticulate ligaments are extensions of pia mater that anchor the spinal cord laterally. The cauda equina refers to a bundle of nerve roots, not an extension of pia mater. Since the second blank is wrong, this option fails to fit the given statement.
Option 3: 'Arachnoid granulations; denticulate ligaments' — Arachnoid granulations are villous projections of arachnoid mater involved in CSF drainage, not extensions of pia mater. While denticulate ligaments are extensions of pia mater, pairing them with arachnoid granulations makes this option inaccurate.
Option 4: 'Arachnoid granulations; filum terminale' — As noted, arachnoid granulations are related to arachnoid mater, not pia mater, and the filum terminale is an extension of pia mater, not paired with arachnoid granulations. This combination doesn't match the anatomical relationship described.
Option 5: 'Denticulate ligaments; filum terminale' — The denticulate ligaments are bilateral extensions of the pia mater that anchor the spinal cord laterally to the arachnoid and dura. The filum terminale is another pia mater extension that anchors the spinal cord inferiorly. Together, these are classic examples of pia mater extensions, fitting the prompt precisely.
In summary, options 1, 2, 3, and 4 contain either misidentified structures or incorrect relationships to pia mater, whereas option 5 accurately names two well-established pia mater extensions. By evaluating the anatomical roles and tissue origins of each term, the pair in option 5 aligns with the described relationship to pia mater.

__ and the are extensions of pia mater.单项选择题

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____________________ and the __________________ are extensions of pia mater.单项选择题