Arrector pili muscle

（重定向自Arrector pilli）

The arrector pili muscles are small muscles attached to hair follicles in mammals. Contraction of these muscles causes the hairs to stand on end, known colloquially as goose bumps.

Each arrector pili is composed of a bundle of smooth muscle fibres which attach to several follicles (a follicular unit), and is innervated by the sympathetic branch of the autonomic nervous system. The contraction of the muscle is then involuntary–stresses such as cold, fear etc. may stimulate the sympathetic nervous system, and thus cause contraction.

单词	Arrector pilli
释义	Arrector pilli 原声例句双语版 TED-Ed 演讲精选 When you're cold, tiny muscles called arrector pilli cause hair to stand upright across the body. 当你冷时叫做立毛肌的小型肌肉会使你身体的毛发竖起来。英语百科 Arrector pili muscle （重定向自Arrector pilli） The arrector pili muscles are small muscles attached to hair follicles in mammals. Contraction of these muscles causes the hairs to stand on end, known colloquially as goose bumps. Each arrector pili is composed of a bundle of smooth muscle fibres which attach to several follicles (a follicular unit), and is innervated by the sympathetic branch of the autonomic nervous system. The contraction of the muscle is then involuntary–stresses such as cold, fear etc. may stimulate the sympathetic nervous system, and thus cause contraction.
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