Related Experiment Video
Updated: Sep 9, 2026

Rodent Estrous Cycle Monitoring Utilizing Vaginal Lavage: No Such Thing As a Normal Cycle
Published on: August 30, 2021
Menstrual disorders in adolescence
1Department of Pediatrics, University of Chicago Pritzker School of Medicine, Illinois.
Abstract:
Current concepts of normal and pathologic puberty have been reviewed because menstrual abnormalities are usually due to abnormal maturation of the reproductive endocrine system. Schema are presented for the initial evaluation of patients with amenorrhea or oligomenorrhea based upon whether they are hypoestrogenic or estrogenized. The role of the bone age in the differential diagnosis of delayed puberty is emphasized. The differential diagnosis and management of excessive genital bleeding and dysmenorrhea in adolescence are given.
Related Concept Videos
Hormonal Regulation of the Menstrual Cycle
At puberty, GnRH begins a pulsatile release pattern, which triggers the anterior pituitary gland to secrete follicle-stimulating hormone (FSH) and luteinizing hormone (LH). The frequency and amplitude of GnRH pulses vary across the menstrual cycle, with faster pulses favoring LH release and slower pulses favoring FSH release.
The Menstrual Cycle
The menstrual phase occurs from days 1 to 5 and involves the shedding of the stratum functionalis, as a uterine...
Menses Phase
When fertilization does not occur, the corpus luteum deteriorates, causing a significant drop in the levels of estrogen and progesterone in the body. This hormonal decrease triggers the release of prostaglandins, which cause the uterine...
Disorders of the Female Reproductive System
Menopause
Disorders of the Male Reproductive System
Prostate disorders are another major concern. These conditions can impair urinary flow due to the prostate's location around the urethra. Symptoms...

