Identify the spinal cord structure indicated by the arrow

Question

BlackTom AI · Accepted Answer

The question asks to identify the spinal cord structure indicated by the arrow in the transverse section model.
First, observe the anatomy shown: the dorsal (posterior) root fibers approach the spinal cord, and on the dorsal root there is typically a swollen enlargement known as the dorsal root ganglion, which contains the sensory neuron cell bodies.
Option: dorsal root ganglion. This structure corresponds to the sensory ganglion located on the dorsal root just outside the spinal cord. The arrow appears to point to a region along the dorsal root where such a ganglion would reside, consistent with the characteristic bulge seen in anatomical models.
Why this is plausible over alternatives: if the arrow had pointed to the main dorsal root fiber bundle itself (without the bulge), one might call it the dorsal root; however, the key identifying feature in this region is the dorsal root ganglion, the swelling containing cell bodies. In many educational images, the dorsal root ganglion is the most distinctive dorsal-root feature visible in cross-section or near the nerve root outside the cord. Since the provided answer specifies dorsal root ganglion, this aligns with the classic teaching point that the dorsal root ganglion sits on the sensory (dorsal) root.
As for possible misconceptions: mistaking the dorsal root for the dorsal root ganglion would overlook the swollen, neuron-containing structure characteristic of a ganglion. Confusing with ventral (motor) roots or with the spinal cord proper would ignore the location and structural distinction of the dorsal root ganglion on the dorsal root. In this context, the arrow’s position best matches the dorsal root ganglion rather than other components.

Anatomy and Physiology Systems I (1016MSC_NA_3251)

Identify the spinal cord structure indicated by the arrow

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