These umbrella cells get their name because they physically stretch out as the bladder fills, just like an umbrella opening up in slow-motion.

伞状细胞因可以随着膀胱扩张而伸展得名，整个膀胱就像一把能缓慢打开的伞。

The bladder is able to expand and contract because it's wrapped in a muscular layer, called the detrusor muscle, and within that, lining the bladder itself is a layer of transitional epithelium containing " umbrella cells" .

膀胱既可以扩张也可以收缩，因为膀胱壁有一层肌肉，叫做逼尿肌，而且膀胱内衬有一层由“伞状细胞”（盖细胞）组成的变移上皮。