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Medical Term:

arrector muscle of hair


Definition: bundles of smooth muscle fibers, attached to the deep part of the hair follicles, passing outward alongside the sebaceous glands to the papillary layer of the dermis; they act to pull the hairs erect, causing “goose bumps” or “goose flesh” (cutis anserina) in humans but increasing the depth (efficiency) of the fur or hair of most animals.

Synonym(s): musculus arrector piliTA, arrector pili muscles, erector muscle of hair
