The acinar arterioles run among the acini or on the surface of lobule, and divide into capillary network of acini. The capillary network of acini is loose.

• 腺泡微动脉自小叶内部行至腺泡周围分成毛细血管网，或穿出小叶至小叶的基底面，沿小叶表面延伸并分成毛细血管网，腺泡毛细血管网排列稀疏。