In Kandel's Principles of Neural Science I found the following figure which shows the innervation of the organ of Corti:
From the legend to this figure (30-10, p. 602):
"The great majority of afferent axons end on inner hair cells, each of which constitutes the sole terminus for an average of 10 axons.[...] Efferent innervation of inner hair cells is sparse."
BUT: The depicted axons that "innervate afferently" hair cells seem to go into the wrong direction (downwards, not upwards). What do the (red) bulbs touching the hair cells represent. I guess synapses, but which one is the presynaptic and which one is the postsynaptic neuron? (I guess: The hair cell is the presynaptic neuron - it's a sensory neuron! But then the neurites emanating from it would be afferent dendrites of the ganglion cells, not axons. I'm lost. Might it be the case that transport along these neurites is active - like in axons, not passive like in dendrites? Or are they called axons because they are myelinated? Or is it because in bipolar cells it is not distinguished between axon and dendrite?)
Question: Why are these neurites called axons?