The Thickness of Human Scalp: Normal and Bald

Abstract

The authors studied the thickness of the layers in both normal and bald scalps to determine the effect of aging on baldness. In non-bald subjects, 1) each scalp layer changes with aging; 2) the most noticeable changes are in the layers that contain hair; 3) the condition of the galea is influenced by aging. In bald subjects, 1) in early male pattern alopecia no changes occur in scalp thickness; 2) in advanced baldness, all skin layers except the galea exhibit definite thinning