Scalp
Regions
The forehead has an appearance of rugae due to the contraction of the underlying frontalis muscle.
The ‘danger area of the scalp’ is the area of loose connective tissue. This is because pus and blood spread easily within it, and can pass into the cranial cavity along the emissary veins. Therefore infection can spread from the scalp to the meninges, which could lead to meningitis.
Reference