JEAN-CLAUDE REVY / SCIENCE PHOTO LIBRARY JEAN-CLAUDE REVY / SCIENCE PHOTO LIBRARY
Uterine lining. Light micrograph of a section through a healthy endometrium (uterine lining) on the 28th day of the menstrual cycle. The endometrium is a membrane that is rich in blood vessels and glands. During the menstrual cycle it increases in thickness in preparation for the implantation of a fertilised egg. If at the end of the cycle (28th day) an egg has not implanted the endometrium is shed during menstruation (period).
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