《黄帝内经·灵枢·阴阳二十五人》
手太阳小肠经的下部，如果气血充盛，则掌上肌肉充实而丰满；气血少，则掌部肌肉消瘦而寒凉。
手太阳之下，血气盛则掌肉充满；血气皆少则掌瘦以寒。
The lower part of the Hand-Taiyang Small Intestine Meridian: if there is abundant Qi and blood, the muscles in the palm are firm and plump; if there is little Qi and blood, the muscles in the palm are thin and cold.