| This is an actual photograph of a serotonin axon terminal (top), a dendrite (bottom), and the synapse in between. Notice the serotonin-filled vesicles inside the axon terminal. You can't actually see serotonin molecules in this picture, nor the reuptake transporters or receptors. This is because they are so small. You can, however, imagine serotonin molecules floating around inside the gray area. Also, notice that some other dendrites are visible even though they haven't been stained like the bright one. |
