The outermost layer of the mucosa is the muscularis mucosa or muscularis interna, and it's a layer of smooth muscle that contracts and helps break down food.
粘膜层的最外层为粘膜肌层，也可称为内肌层；它由一层平滑肌构成，可帮助碾碎食物。
Muscularis mucosa
原声例句
Osmosis-解剖与生理
Osmosis-消化
The mucosa also has three layers of its own: a layer made of stratified squamous epithelium; a layer of connective tissue, called the lamina propria; and a layer of muscle cells, called the muscularis mucosae.
黏膜层本身又由三层结构组成，一层复层鳞状上皮，一层结缔组织，又叫固有层，还有一层肌细胞，又叫黏膜肌层。
英语百科
Muscularis mucosae
（重定向自Muscularis mucosa）
The lamina muscularis mucosae (or muscularis mucosae) is a thin layer of muscle of the gastrointestinal tract, located outside the lamina propria mucosae and separating it from the submucosa. It is present in a continuous fashion from the oesophagus to the upper rectum (the exact nomenclature of the rectum’s muscle layers is still being debated). A discontinuous muscularis mucosae-like muscle layer is present in the urinary tract, from the renal pelvis to urinary bladder; as it is discontinuous it should not be regarded as a true muscularis mucosae.
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