Tiny, smooth muscles attached to hair follicles, contraction causes the hair to stand upright: Term. Definition. 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. What is one major function of arrector pili muscle contraction that is particularly important in nonhuman mammals? 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. Each arrector pili is composed of a bundle of smooth muscle fibres which attach to several follicles (a follicular unit). eponychium: Definition. moves hair shaft perpendicular to skin; causes goosebumps: Term. ... arrector pili muscle: Definition. 7. It is a specialized form of epidermis that is found over the base of the nails of the fingers. 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 When stimulated, the arrector pili muscle pulls on the follicle and raises the hair. stratum corneum: Definition. This process is vestigial in humans because we don't have enough hair or fur to make it worthwhile. Each is innervated by the sympathetic division of the autonomic nervous system. The muscle attaches to the follicular stem cell niche in the follicular bulge, splitting at their deep end to encircle the follicle. Definition. US-Gov / Wikimedia Commons / Public domain. This type of smooth muscle is observed in the large airways to the lungs, in the large arteries, the arrector pili muscles associated with hair follicles, and the internal eye muscles which regulate light entry and lens shape. Function. Structure. Answer: C. Eponychium hair follicle: Definition. Arrector Pili . 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. structure with outer and inner root sheaths extending from the epidermal surface into the dermis and from which new hair develops. 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. Also know as acne vulgaris' skin disorder characterized by chronic inflammation of the sebaceous glands from retained secretions and Propionibacterium acnes (P.acnes) bacteria. 7. 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). brawn; power; force; organ that produces movement Not to be confused with: mussel – a bivalve mollusk or clam Abused, Confused, & … arrector pili: Definition. 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. 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