## 4 Discussion  
This preliminary research results provide evidence that MEP and ENG recordings induced at levels of spinal roots and [PERSON]'s point in patients following the brachial plexus injury may precisely reveal the advancement of the abnormalities in the motor neural conduction on the symptomatic side mainly from the C5-C7 root domains. It appears that the parameter of the amplitude, rather than the latency, has greater significance in an evaluation of the pathology advancement on the symptomatic side when MEP studies are utilised. Taking into account its non-invasive and less painful properties and high diagnostic precision it seems to be superior to the ENG method. Moreover, this study's results confirmed the axonotmess and neuropraxia type of injury in motor fibers in correlation with EMG results. The results of neurophysiological tests ENG, EMG, MEP, and SNCS presented in this article are consistent with our previous observations [3,4], allowing us to determine the functional state of muscles and nerves damaged at the level of the brachial plexus. The main goal of rehabilitation in patients after the brachial plexus injury is the inhibition of the degeneration and activation of the regeneration process in the nerves and reinnervation in the muscle. Nerve regeneration refers to the proliferation of axons towards the muscle and is further associated with the process of remyelination of previously damaged axons. However, muscle reinnervation is crucial for maintaining the function of myocytes and preventing their atrophy. Reinnervating motor units as well as those units \begin{table}
\begin{tabular}{c c c c c c c c c c c c c c c} \hline \hline  & & & & & & & & & & & & & & & & & & & \\ \cline{2-13}  & **1** & **2** & **3** & **4** & **5** & **6** & **7** & **8** & **9** & **10** & **11** & **12** & **13** & **14** \\ \hline \multicolumn{13}{c}{EMG *} \\ \hline Deltoid muscle & 3 & 3 & 3 & 4 & 3 & 4 & 1 & 1 & 1 & 3 & 3 & 3 & 3 & 3 \\ Biceps brachii muscle & 3 & 3 & 3 & 4 & 3 & 4 & 1 & 1 & 2 & 3 & 2 & 3 & 3 & 2 \\ Triceps brachii muscle & 3 & 3 & 2 & 0 & 3 & 4 & 1 & 1 & 4 & 4 & 2 & 2 & 4 \\ First dorsal interosseus & 2 & 3 & 4 & 2 & 3 & 4 & 1 & 1 & 4 & 4 & 4 & 2 & 3 & 4 \\ \hline \multicolumn{13}{c}{SNCS **} \\ \hline \multicolumn{13}{c}{Median nerve} \\ \hline Digit 1 & 2 & 1 & 2 & 2 & 1 & 2 & 0 & 0 & 1 & 2 & 2 & 2 & 1 & 2 \\ Digit 2 & 2 & 1 & 2 & 2 & 2 & 2 & 0 & 0 & 1 & 2 & 2 & 2 & 2 & 2 \\ Digit 3 & 2 & 1 & 2 & 2 & 2 & 2 & 0 & 0 & 2 & 2 & 2 & 2 & 2 \\ Radial nerve & 2 & 1 & 2 & 0 & 2 & 2 & 0 & 0 & 2 & 2 & 2 & 2 & 1 & 2 \\ Ulnar nerve & 1 & 1 & 2 & 1 & 2 & 2 & 0 & 0 & 1 & 2 & 1 & 2 & 2 & 1 \\ \hline \hline \end{tabular}  
* Abbreviation: “ type of muscle injury in EMG study: 0—lack of spontaneous activity; 1—signs of denervation activity; 2—neuropraxia injury with denervation activity; 4—normal bioelectric muscle activity; ** sensory component: 0—lack of sensory potential; 1—pathological value of sensory potentials; 2—normal conduction in sensory nerves.  
\end{table} 
Table 6: Results of EMG and SNCS studies. that have undergone axonal damage strive to reinnervate myocytes. Due to recording in neurophysiological tests of mainly neurogenic changes with active denervation, this corresponds to the simultaneous coexistence of both the degenerative process, resulting in axonal damage, and reinnervation processes that take place in the muscle. The first step of physiotherapeutic procedures is to stop this \"vicious circle\". Significant atrophy of myocytes may stop the process of returning the function of the motor unit as a functional complex [8; 31; 32; 33; 34]. Various physiotherapy techniques (electotherapy and kinesotherapy) may have a positive impact on the regeneration processes, both at the physiological and morphological phenomena in the nerves. Rehabilitation should incorporate the treatment supporting nerve regeneration, muscle strengthening, and maintaining functional ranges of motion of the injured extremities. It comprises the neuromuscular electrical stimulation (NMES) [12; 34; 35].