EN
This paper presents the results of studies to determine the influence of biological factors on speech development. The studies conducted among children aged 5 to 7 concern the correlation between the myofunctional and occlusal disorders and articulation. The presented studies confirm that there is a relationship between the occurrence of myofunctional and occlusal disorders and abnormal articulation, particularly its distorted realizations. This correlation is the strongest in complex oral (orofacial) motor disorders. Moreover, it is demonstrated that in the majority of children with malocclusion abnormal articulation can be observed.