arrector pili: Any of the small muscles attached to hair follicles in mammals; when the muscles contract they cause the hairs to stand on end. 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. US-Gov / Wikimedia Commons / Public domain. The muscle attaches to the follicular stem cell niche in the follicular bulge, splitting at their deep end to encircle the follicle. D: The arrector pili muscle (APM) consists of a small band of smooth muscle that connects the hair follicle to the connective tissue of the basement membrane. ... arrector pili muscle: Definition. Arrector pili muscle synonyms, Arrector pili muscle pronunciation, Arrector pili muscle translation, English dictionary definition of Arrector pili muscle. Also know as acne vulgaris' skin disorder characterized by chronic inflammation of the sebaceous glands from retained secretions and Propionibacterium acnes (P.acnes) bacteria. Definition. Definition. Tiny, smooth muscles attached to hair follicles, contraction causes the hair to stand upright: Term. 7. Each arrector pili is composed of a bundle of smooth muscle fibres which attach to several follicles (a follicular unit). Thickend epithelial … structure with outer and inner root sheaths extending from the epidermal surface into the dermis and from which new hair develops. When stimulated, the arrector pili muscle pulls on the follicle and raises the hair. moves hair shaft perpendicular to skin; causes goosebumps: Term. hair follicle: Definition. eponychium: Definition. What is one major function of arrector pili muscle contraction that is particularly important in nonhuman mammals? It is a specialized form of epidermis that is found over the base of the nails of the fingers. Structure. Each is innervated by the sympathetic division of the autonomic nervous system. A ribbon of smooth muscle, the arrector pili muscle, extends from the papillary layer of the dermis to the connective tissue sheath surrounding the hair follicle. brawn; power; force; organ that produces movement Not to be confused with: mussel – a bivalve mollusk or clam Abused, Confused, & … 7. A tiny, involuntary muscle fiber inserted in the base of the hair follicle is the: arrector pili: The oil glands of the skin connected to the hair follicles are: sebaceous glands: An oily substance secreted from the sebaceous glands is: sebum: The overlapping layer of hair with transparent, scalelike cells is the: cuticle stratum corneum: Definition. Arrector Pili . Arrector pili muscle Definition A bundle of smooth muscle cells attached to each hair follicle contracts to straighten and raise the hair follicle, resulting in piloerection (goosebumps). This process is vestigial in humans because we don't have enough hair or fur to make it worthwhile. When humans become cold, or sometimes scared, we get goosebumps, which are caused by the arrector pili muscle in the skin contracting and pulling the hair shaft upward. Layer of epidermis where there is the most rapid cell division: Term. Function. The integumentary system functions in thermoregulation—the ability of an organism to keep its body temperature within certain boundaries—even when the surrounding temperature is very different. a) The arrector pili muscle contracts to allow for hair growth b) The arrector pili muscle contracts to shed dead hairs c) The arrector pili muscle contracts to alarm an approaching predator d) All of the above are true arrector pili: Definition. Answer: C. 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