PATHOLOGY

Detailed explanation-1: -Menarche is defined as the first menstrual period in a female adolescent. Menarche typically occurs between the ages of 10 and 16, with the average age of onset being 12.4 years.

Detailed explanation-2: -Menarche. Despite variations worldwide and within the U.S. population, median age at menarche has remained relatively stable-between 12 years and 13 years-across well-nourished populations in developed countries Box 1 2 3.

Detailed explanation-3: -The first menstrual cycle is called menarche. This starts the fertility period in the life of a female. Post-menarche, the female body typically prepares for a possible pregnancy every month. Each month, an ovary releases a mature egg by the process of ovulation.