上皮下为疏松结缔组织，结缔组织的主要成分为胶原纤维。
Under the epithelia is loose connective tissue whose chief elements are collagen fibers.
上皮下层有富含血管的疏松结缔组织，且该血管上皮有丰富的微饮小泡。
The loose connective tissue rich in blood vessels located in the subepithelial layer, and most m…
上皮下层有富含血管的疏松结缔组织，且该血管上皮有丰富的微饮小泡。
The loose connective tissue rich in blood vessels located in the subepithelial layer, and most m…
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