The tunica adventitia of the big veins was very thick and was comprised of abundant smooth muscular bundles, collagen and elastic fibers.
英
美
释义
大静脉的内膜与中膜均较薄,中膜由数层平滑肌构成,外膜则很厚,由大量平滑肌束及胶原纤维、弹性纤维构成。
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