Ganglion cell:

cell layers of the retina with arrows designating a few ganglion cells. the other cells to the right of the labeled cells are also ganglion cells.

can refer to any neuron found in a ganglion, however it is often used to refer to retinal ganglion cells. These cells carry visual information out of the eye, forming the optic nerve.

Read more: Know your brain - Retina

Watch this 2-Minute Neuroscience video to learn more about the retina.