The ureter has 4 distinct layers of tissue which form the mucosal, lamina propria, muscularis, and adventitia. The ureter is lined with transitional epithelial tissue. This allows for distension (expansion) as urine flows through the ureter. The lamina propria is deep the mucosal layer and is made up of a mix of areolar and elastic connective tissue. Opposite to the digestive system, the muscularis is made up of an inner longitudinal layer and an outer circular layer. These layers propel the urine by peristaltic contractions. Lastly, an adventitia made of dense irregular connective tissue wraps the ureter.
These pictures were taken by me in the spring of 2021. They progress from scanning power (40x) to high power (400x). Go through the pictures. Select one, draw it, and label the layers.
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