>>27153261To the factors underlying, this is due to the lack of an increase in cranial growth after puberty which occurs in the higher apes, and in some types of men. These checks also cater to the nutritional benefit of the older, more primary skull, whence result the many irregularities in development that constitutes so much of the stigmatic disgrace of the poorly formed cranium. The sutures, in some cases, do not form because sufficient gristle or stem cells are not produced to fill the gaps.
These subsidiary gaps are often filled or replaced by new dermal bones called Wormian bones. Sometimes this deficiency cohabitates with a premature synostosis elsewhere in the skull or the body. As Dr. Eugene Solomon Talbot’s notes in his physiological book, “Degeneracy: Its Causes, Signs, and Results”, “This type of skull, however, is usually associated with deep degeneracy… As a rule, this condition is found by idiots, and often renders them unteachable.”