arrector pili


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arrector pili

pl. arrectores pilorum [ä·rek′tor pī′lī]
Etymology: L, raisers of the hair
minute smooth muscles of the skin, attached to the connective tissue sheath of the hair follicles; when they contract they cause the hair to stand erect, producing the appearance called goose flesh.

arrector pili

(ă-rek′tŏr pī′lī″, pil′ē) (ar″ek′tōr′ēz pī″lōr′ŭm, pil-ōr′) plural.arrectores pilorum [L. arrector, raiser + pilus]
One of the involuntary muscle fibers arising in the skin and extending down to connect with the hair follicles on the side toward which the hair slopes. After certain stimuli, including cold or fright, the muscle fibers contract, straighten the follicles, and raise the hairs, resulting in piloerection.
References in periodicals archive ?
A high concentration of Merkel cells in the bulge prior to the attachment of the arrector pili muscle and the formation of the perifollicular nerve plexus in human fetal skin.
Goosebumps happen when the tiny muscles in each hair follicle, called arrector pili muscles, contract, says Dr.
A small muscle, the arrector pili, is attached to the wall of the follicle and to the lower layer of the epidermis.
Each tiny hair on your skin is attached to small muscles, called arrector pili muscles.