There is supposedly something unique with regards to infections of the scalp, although I cannot remember, perhaps it was to do with the CSF and its build up? I have scoured the internet for hours but have not found an answer.
Deep lacerations of the scalp that penetrate the fourth layer (area of loose connective tissue) have an increased risk of infection. This is because pus and blood spread easily within it. This can easily pass into the cranial cavity along the emissary veins Therefore, infection can spread from the scalp to the meninges and could lead to meningitis.