Cephalosomatic anastomosis (HEAVEN/AHBR) is enabled by the GEMINI spinal cord fusion protocol [1, 2] . This hinges on two pillars: the possibility to refuse a certain number of axons of the severed cords by way of substances called fusogens [1-3] and, more importantly, on the reconnection of the cortico-truncoreticulopropriospinal (CTRPS) pathway, a sensorimotor highway that links the motor cortical areas to the spinal motor neurons via the brainstem reticular formation and spinal propriospinal

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... neurons (or interneurons) [2,4]. As explained [1,2], a very sharp severance ensures virtual sparing of the gray matter at the point of section, so that cells on both sides of the fusion interface can reextend [resprout] their axons and reestablish continuity. To accelerate this process of reconnection, electrical stimulation at the interface will be delivered via an implanted, peridural multichannel paddle.