These notches are known in Anodonta as the afferent and efferent siphonal notches respectively, and correspond to the long tube-like afferent inferior and efferent superior siphons formed by the mantle in many other Lamellibranchs (fig.
Exner first showed, many years ago, that the nerve impulse travels through the spinal ganglion at the same speed as along the other parts of the nerve trunk - that is, that it suffers no delay in transit through the perikarya of the afferent rootneurons.
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