(USMLE topics, reproductive system) This video is available for instant download licensing here: https://www.alilamedicalmedia.com/-/galleries/all-animations/female-reproductive-system-videos/-/medias/73349844-d3cc-11e3-b500-f2b86e40979d-the-menstrual-cycle-narrated-video ©Alila Medical Media. All rights reserved. Support us on Patreon and get FREE downloads and other great rewards: patreon.com/AlilaMedicalMedia Understanding the menstrual cycle. The menstrual cycle is a term used to describe monthly events that occur within a woman’s body in preparation for the possibility of pregnancy. Each month, an egg is released from an ovary in a process called ovulation. At the same time, the lining of the uterus thickens, ready for pregnancy. If fertilization does not take place, the lining of the uterus is shed in menstrual bleeding and the cycle starts over. An ovary contains hundreds of thousands of primary oocytes – immature eggs, or ova. Each of these is enclosed in a structure called a follicle, and at this stage — a primordial follicle. The menstrual cycle is under control of hormones secreted by the pituitary gland and the ovaries. The pituitary itself is under control of the hypothalamus. The hypothalamus produces a hormone called the gonadotropin-releasing hormone or GnRH. GnRH stimulates the anterior lobe of the pituitary to secrete follicle-stimulating hormone (FSH). FSH travels in the bloodstream to the ovaries and stimulates a group of follicles to grow. These primordial follicles develop into primary follicles and then secondary follicles. These produce a hormone named estrogen which acts to stimulate the growth of the endometrium — the inner lining of the uterus. The secondary follicles compete with each other and only one of them will survive and become a mature follicle, the rest atrophy and die. The increasing level of estrogen also acts on the hypothalamus and the anterior pituitary to increase the level of GnRH and induce the production of another hormone — luteinizing hormone (LH). A surge in LH secretion triggers ovulation – the release of the egg from the follicle and the ovary. The egg is then swept up by the fimbriae (FIM-bree-ee) and taken into the uterine tube. Fertilization by a spermatozoon, when it occurs, usually takes place in the ampulla, the widest section of the fallopian tube. The fertilized egg immediately begins the process of development while travelling toward the uterus. After 6 days it becomes a blastocyst and is implanted into the endometrium of the uterus. Meanwhile, the left-over of the ruptured follicle has become a corpus luteum which secretes progesterone. Progesterone further stimulates uterine development making it a nutritious bed for the embryo in the event of pregnancy. In the absence of pregnancy, the corpus luteum atrophies and progesterone level falls. This leads to the breakdown of the endometrium, menstruation begins and the cycle starts over. All images/videos by Alila Medical Media are for information purposes ONLY and are NOT intended to replace professional medical advice, diagnosis or treatment. Always seek the advice of a qualified healthcare provider with any questions you may have regarding a medical condition.

Hormonal Control of the Menstrual Cycle, Animation.
- Post author:
- Post published:May 5, 2021
- Post category:Uncategorized
- Post comments:0 Comments
You Might Also Like

SportsTracker: define sport types

Sperm Counts Plummeting…But Not Everywhere

TSH Levels

Overweight & Obesity Video – 11

Do Isometrics Build Muscle? (YES IF…)

2d echo real video

Spa Associations Video – 2

Thyroid Hormone Synthesis

Celery and lemon Drink The Quickest Way to Burn fat and Lose Weight

How to Plan Workouts in a Week

How to Do a Bench Dip | Arm Workout

4 Variations Crunches for Flat Stomach Workout in 7 Days | How to Lose Your Belly Fat Exercises

Short Dynamic Warmup for Running

How to Test hCG Levels at Home

How to Do the Overhead Shoulder Press | Arm Workout

Barbell Bench Press – HASfit Chest Exercise Demonstration – Flat Bench Presses Form – Pectoral

Do You Need More Protein Than You Think You Do?

Treating Cystic Acne with Accutane or Isotretinoin

Testosterone Side Effects Linked to Increased Risk of Heart Attack for Lawyers

Geriatric Physiotherapy Video – 11

What Is Aerobic Respiration? | Physiology | Biology | FuseSchool

Why Should Endurance Athletes Choose a Ketogenic Diet? | Dr.Berg

Hypertension and Stroke (Health Tip)

Ballistic Stretching

Law 6: Optimize with a Pre-Workout | 10 Laws Of Muscle-Building

What is BMR ? BMR means what ?

Food Guide Pyramid Video – 1

How To Gain Weight Fast: 3 Crazy Tricks That Work (Skinny Guys Only)

Cardiac Drugs Quick and Dirty Summary

Leg Curl-5

What & When to Drink | Running

What is Osteoporosis?

Creatine: How to Best Use It for Muscle Growth (Avoid Side Effects)!

Weight Training Video – 5

Community Psychology Video – 1

Industrial Chemicals by Krishna Antioxidants Pvt Ltd, Mumbai

HGH, Growth Hormones & Plant Hormones Video – 24

IAEA – What is water?

TUBERCULOSIS Signs and Symptoms

How to Do a Hammer Curl | Female Bodybuilding

Table Tennis Video – 1
