As many as 143 patients with concussion and 79 with contusion of the brain of the mild degree were examined. In concussion, the oral reflex never occurs. Meanwhile Marinesco-Radovici reflex is positive almost in 90%, appearing, however, not earlier than 6 hours after the injury and lasting up to 7-16 days. It should be mentioned that in 53.5%, the reflex is unilateral. The latter fact indicates that in concussion, over half the patients manifest the signs of cortical focal derangement together with general cerebral disseminated minisymptoms, seen throughout 1-2 weeks. In mild contusion of the brain in the acute stage, the oral reflex is detectable in 27% of cases. Marinesco-Radovici reflex appears only by days 2-4 after the contusion. The data obtained are helpful in defining the level, degree of the involvement of brain structures, and dynamics of their reverse development in patients with craniocerebral injury, thereby contributing to adequate differential diagnosis of concussion and contusion of the brain of the mild degree.