Related Experiment Video
Updated: Jul 22, 2026

09:15
Two Methods for Establishing Primary Human Endometrial Stromal Cells from Hysterectomy Specimens
Published on: May 23, 2014
Serum beta-human chorionic gonadotropin levels and endometrial thickness after medical abortion
B Harwood1, K R Meckstroth, D R Mishell
1Reproductive Women's and Children's Hospital, LAC+USC Medical Center, Los Angeles, CA, USA.
Contraception
|July 13, 2001
Abstract
No abstract available in PubMed .
Related Concept Videos
Hormonal Regulation of the Menstrual Cycle
The ovarian cycle regulates endometrial changes throughout a single menstrual cycle via the coordinated action of gonadotrophin-releasing hormone (GnRH) and gonadotrophins.
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.
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.
Ovarian Cycle
The menstrual cycle includes a critical component known as the ovarian cycle, which undergoes two main phases each month—the follicular phase and the luteal phase. The follicular phase is variable and averaging around 14 days. Ovulation, triggered by a surge in luteinizing hormone (LH), marks the transition between the two phases. The second phase, the luteal phase, is relatively consistent, lasting approximately 14 days, and is marked by the activity of the corpus luteum. While a cycle length...

