There is described an implantable assembly for the selective acquisition of a neuronal electrical signal propagating along at least one nerve fiber contained in a bundle of nerve fibers, as well as selective electrical stimulation of at least one nerve fiber, An implantable electrode assembly (E) disposed on a biocompatible support substrate (1) that can be positioned around the nerve fiber bundle in a cuff-shaped manner, the implantable electrode assembly (E) A first electrode assembly (2) and a second electrode assembly (12) having a surface (1 ') and for selective acquisition of a neuron electrical signal and selective electrical stimulation of at least one nerve fiber, (E), <； / RTI >；<； RTI ID = 0.0 >； An analysis / control unit (A / S) which can be electrically connected or connected to the implantable electrode assembly (E), characterized in that the ECG signal as well as the positionally obtained neuronal electrical signals are transmitted in a time- An analysis / control unit (A / S), which can be analyzed so that a neuron time signal correlated with physiological parameters, preferably blood pressure, can be derived, - a first comparator unit (K1) connected to the analysis / control unit (A / S), the first comparator unit (K1) having a first comparator unit K1), - a first function generator (F1) coupled to the analysis / control unit (A / S), wherein the first function generator (F1) A first function generator F1 for generating a positive signal composed of a plurality of N individual pulses EP in phase and amplitude of the derived neuron time signal, A first signal-to-current converter (SSW1) connected directly or indirectly to a first function generator (F1) and a first electrode assembly (2), the first signal-to-current converter Current converter (SSW1), which leads to the electrode assembly (2) The first signal-to-current converter (SSW1) as well as the analysis / control unit (A / S), the first comparator unit (K1) and the first function gene
