Nerves: Ganglia

photo 1: of dorsal root ganglion photo 2: of dorsal root ganglion

Nerve Ganglia

Ganglia are nodular masses of neuronal cell bodies (ganglion cells), together with their suporting neuroglia (capsule cells)

There are two types of ganglia in the PNS:

  • sensory ganglia: - cell bodies of sensory neurons
  • autonomic ganglia: cell bodies of efferent neurons from the autonomic nervous system.

Now look at the images on the left, sections of a dorsal root ganglion stained with Masson's trichrome.

Make sure you can identify the fascicles of nerve fibres leading to and/or from the ganglion and the large perikarya of the pseudounipolar neurons.

questionWhy do you think many of the perikarya are large?