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. 2002 Apr;146(4):657-8.
doi: 10.1046/j.1365-2133.2002.04541.x.

Arrector pili muscle: evidence of proximal attachment variant in terminal follicles of the scalp

Carlos Baptista Barcaui  1 , J Piñeiro-Maceira, M M de Avelar Alchorne
Affiliations

Arrector pili muscle: evidence of proximal attachment variant in terminal follicles of the scalp

Carlos Baptista Barcaui et al. Br J Dermatol. 2002 Apr.

Abstract

Background: There is general agreement that the proximal attachment site of the arrector pili (AP) muscle, via elastic tendons, is the bulge region, where follicular stem cells are situated. A variant of this insertion, in which the AP muscle surrounds the follicle circumference, has been described in human facial vellus hair follicles.

Objectives: To investigate whether terminal hair follicles of the human scalp may also present this variant of proximal insertion of the AP muscle.

Methods: Histological and immunohistochemical methods were used.

Results: At the bulge level, bundles of the AP muscle were seen to encircle the entire hair follicle.

Conclusions: Terminal follicles of the human scalp may also present this variant of proximal insertion of the AP muscle.

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