...髓段之侧角) Th th ti di i i d The parasympathetic division does not innervate sweat glands(汗腺), arrector pili (竖毛肌)or blood vessels Sympathetic ganglia(交感分系的神经节)： 交感 经节 椎旁 经节 ‐‐‐ sympathetic trunk ganglia (交感神经节...
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When our ancestors were covered in fur, muscles in their skin called "arrector pili" contracted when they were upset or cold, making their fur stand on end.
当我们的祖先身体被毛发覆盖时，当人感到沮丧或者寒冷的时候皮肤上的一种叫“立肌”的肌肉会收缩，使他们的毛发竖立起来。
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。
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