Final answer:
Retinal ganglion cells receive input from bipolar cells and send an axon into the optic nerve.
Step-by-step explanation:
The cell in the retina that receives input from bipolar cells and sends an axon into the optic nerve is the retinal ganglion cell. These cells are part of the inner synaptic layer of the retina and connect the bipolar cells to the optic nerve. The axons of retinal ganglion cells collect at the optic disc and leave the eye as the optic nerve, carrying visual information to the brain.