What is the collection of nerve roots found at the inferior end of the vertebral column called?

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BlackTom AI · Accepted Answer

To begin, consider what each option represents in spinal anatomy.
Option 1: filum terminale. This is a slender strand of pia mater extending from the conus medullaris to the coccyx, providing longitudinal support for the spinal cord. It is not a collection of nerve roots, but rather a connective tissue filament. Therefore this choice is inaccurate as the question asks specifically about a collection of nerve roots.
Option 2: conus medullaris. The conus medullaris marks the tapered end of the spinal cord itself, typically around L1–L2 in adults. While it is at the terminus of the spinal cord, it is not a bundle of nerve roots below that point. Thus this option does not describe the inferior collection of roots.
Option 3: cauda equina. The cauda equina refers to the bundle of dorsal and ventral nerve roots that traverse the lumbar cistern below the conus medullaris, resembling a horse’s tail. These are indeed the nerve roots gathered at the lower end of the vertebral column, within the subarachnoid space. This aligns precisely with the question’s description.
Option 4: cervical enlargement. This term describes a region of the spinal cord enlarged to accommodate neurons for the upper limb innervation, located in the cervical region. It is unrelated to the inferior end of the vertebral column and does not describe a collection of roots.
In summary, the only option that matches the concept of a bundled collection of nerve roots at the lower end of the spine is the cauda equina, while the other options refer to structures or regions that do not constitute that collection.

Anatomy and Physiology Systems I (1016MSC_NA_3251) Post-Lab Quiz 3: Nervous System

What is the collection of nerve roots found at the inferior end of the vertebral column called?

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