Definitions of terms masticatory system and vocal organs are used as introduction to analysis of their relations. Articulation involves masticatory and respiratory systems the primary functions of which are different from generation of sounds and particularly speech. However, proper and consistent action of these systems is indispensable for generation of understandable words. The paper presents basic properties of structure and functions of masticatory system at various levels of its development. Particular attention was concentrated on all elements of mascicatory system (lips, dental arches, tongue, palate, and muscles of temporomandibular joints) on shaping mechanisms of speech.