The inner mucosal layer of the uterus that is sloughed off approximately every 28 days is called the: 23:06 Biology Chapter 16 The inner mucosal layer of the uterus that is sloughed off approximately every 28 days is called the: A) endometrium B) myometrium C) perimetrium D) epimetrium E) hypometrium Answer: A Learn More : Share this Share on FacebookTweet on TwitterPlus on Google+