Microtubules in synapses of the retina

Using a new method, microtubules can be seen running up to, and lying in close relationship with, the synaptic ribbons in the outer and inner plexiform layers of the frog retina. In the inner plexiform layer microtubules can be seen running up to the terminal membrane in the non-ribbon synapses. Unlike non-ribbon C.N.S. synapses (frog and rat) processed by the same method. There is no clear association between synaptic vesicles and microtubules in the approach regions.