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Skull as a complicated mechanical construction, which consists from 28 different bones, connected by sutures of different kinds, structure from smoothly (bones of face) to teeth-like covered to brain. Basically, skull it is possible to select to kinds face skull and brain skull “face skull” and “brain skull”, peculiarities of the last, which composed from 8 bones with complicated connections between them, will be described at the present chapter. Structure of “brain skull”, which below for simplicity it will be called as “skull” only, is the most complicated and changeable not only at age aspect, for person, represent the same age and race. The most pronounced mechanical changes skull properties and in babies and juniors are observed, which is connected with growing of brain. Later, structural changes of the skull are concentrated at structure of sutures, tissues of which become less elastic with age. Volume of internal cavity of the skull of adult persons is balanced with volume of skull filled media so precisely, that internal surface of the skull bone reflect the structure of the brain and its vascular system. This is confirmed the idea, that skull play protector function for brain and it is well known.