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1·Along one side of the follicle, two buds are formed: an upper, which develops into the sebaceous gland, and a lower, which becomes the attachment for the arrector pili muscle.

毛囊的一侧形成两个胚芽：上部胚芽生长进入皮脂腺，下部胚芽形成立毛肌的附着处。