The edges of the tectonic plates
The short answer is yes, the edges (boundaries) of tectonic plates do occur at the mid-oceanic ridges, such as the Mid-Atlantic ridge.

There are three types of tectonic plate boundaries:


Transform Boundaries where the plates slide past each other sideways, such as at the San Andreas Fault.
Divergent Boundaries where the plates are moving apart, such as the Mid-Atlantic Ridge  and the East African Rift.
Convergent Boundaries where one plate slides beneath the other plate, such as the Andes mountain range &amp; the Japanese island
arc.