The specialized region of the sarcolemma that has folds and indentations to increase the membrane surface area covered by the synaptic knob is the

It would be the motor end plate that is the specialised region wherein folds and intentions takes place to increase the surface area of the membrane. To add up, this terminal formation usually functions as the one that initiates contact from the axon to the muscle fibre.

Idont know but good luck; )