The richer sympathetic innervation in the submandibular glands of the adult male mice is evidently related to the greater development of their convoluted tubules whose cells manufacture NGF.

• 成年雄性小鼠的领下腺内有较丰富的交感神经末梢，显然与成年雄性小鼠的领下腺有高度分化的卷曲小管，产生大量的神经生长因子(NGF)有关。