Where is uterine fundus

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This is the thick middle muscle layer of the corpus or fundus. This expands during pregnancy to hold the growing baby. It contracts during labor to push the baby out. This is the smooth outer layer. It covers the uterus and makes it easy for the uterus to move in the pelvis as needed.

In women who still have their periods, 1 ovary releases an egg into a fallopian tube each month. During this time, the endometrium becomes thicker to prepare for a fertilized egg. The egg enters the uterus. If the egg joins with a male sperm cell, this fertilized egg attaches to the endometrium.