Which label would identify the capsule surrounding the dorsal root ganglion on a labeled diagram?

Which label would identify the capsule surrounding the dorsal root ganglion on a labeled diagram?

• A. Satellite cells
• B. Neurokeratin
• C. Lipofuscin
• D. Capsule of dorsal root ganglion

Answer: (D)

The key idea is identifying the outer connective tissue layer that encases the entire dorsal root ganglion. The capsule of dorsal root ganglion is the fibrous covering that surrounds the whole ganglion, so labeling that outer boundary correctly identifies the structure. Satellite cells, by contrast, are small glial cells that wrap around individual neuron cell bodies within the ganglion, not the outer capsule. Lipofuscin is aging pigment that can accumulate in neurons, and neurokeratin isn’t a standard structure used to label in this region.

The key idea is identifying the outer connective tissue layer that encases the entire dorsal root ganglion. The capsule of dorsal root ganglion is the fibrous covering that surrounds the whole ganglion, so labeling that outer boundary correctly identifies the structure. Satellite cells, by contrast, are small glial cells that wrap around individual neuron cell bodies within the ganglion, not the outer capsule. Lipofuscin is aging pigment that can accumulate in neurons, and neurokeratin isn’t a standard structure used to label in this region.