the meaning of the medical term microcephalus is
Microcephaly Microcephaly is a medical condition in which the brain does not develop properly resulting in a smaller than normal head.[1] Microcephaly may be present at birth or it may develop in the first few years of life.[1] Often people with the disorder have an intellectual disability, poor motor function, poor speech, abnormal facial features, seizures, and dwarfism.[1]
Crown (anatomy) Crown can mean the top of the head and it can also mean the whole head.[1] In the study of human anatomy the terms "Calvaria, "skullcap", "skull cap", or the "roof of the cranial cavity" are used for the top part of the head.[2]