Scalp (Definition). Scalp is the part of the skin on the skull, deeply attached to the skull and has the hair shafts from it.Rest of the skin in the head like facial skin(beard) has only 2 layers-epidermis and dermis.calp is the part of the skin on the skull, deeply attached to the skull and has the hair shafts from it.Rest of the skin in the head like facial skin(beard) has only 2 layers-epidermis and dermis.