 A discontinuous muscularis mucosae–like muscle layer is present in the urinary tract, from the renal pelvis to the bladder; as it is discontinuous, it should not be regarded as a true muscularis mucosae.In the gastrointestinal tract, the term "mucosa" or "mucous membrane" refers to the combination of epithelium, lamina propria, and (where it occurs) muscularis mucosae.The etymology suggests this, since the Latin names translate to "the mucosa's own special layer" ("lamina propria mucosae") and "muscular layer of the mucosa" ("lamina muscularis mucosae").