Tunica adventitia: entirely made of connective tissue. It also contains nerves that supply the muscular layer, as well as nutrient capillaries (vasa vasorum) in the larger blood vessels.

 
  • 外膜:完全由结缔组织构成。并含有支配肌层的神经。在较大血管中含有营养毛细血管(血管滋养管)。
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