Experimental muscle reinnervation by allogeneic biomaterial illustrates restoration of interlevel relations in human body

The objective of our study was to reveal the morphofunctional interactions between allografts and the recipient nervous system from the experimental model of the mimetic musculature reinnervation. Materials and Methods. The experiments were conducted on Chinchilla rabbits (n=36). All animals were subjected to the facial nerve transection. No other manipulations were performed in the Control Group (n=9). In Treatment Group 1 (n=12), an autograft fragment of the masseter muscle with a neurovascular bundle was attached to the denervated buccinator. In Treatment Group 2 (n=15), allogeneic biomaterials – specifically, Regeneration Stimulator and Vasculogenesis Stimulator, were inserted between specified muscles. The animals were removed from the experiment on days 10, 30, 60 and 180. Tissue pieces from the operation zone were analyzed using transmission electron microscopy. Results. It was established that compensatory and restorative processes in the Control Group and Treatment Group 1 end with scarring of the boundary zone and contracture of mimetic muscles. In Treatment Group 2, we observed revascularization of mimetic musculature, as well as axonal ingrowth into the buccinator and restoration of neuromuscular synapses. Conclusion. Allogeneic biomaterial transplantation creates adequate conditions for the restoration of the organ vascular bed and the innervation apparatus of denervated mimetic muscles. The results of our experiments could be regarded as an example of restoring the interlevel relations in the human body following the use of allogeneic biomaterials.