OVARIAN CYCLE.

Slides:

Advertisements

Similar presentations

Reproductive Hormones

Advertisements

Female Hormone Regulation

8.5 Reproduction and Hormones

The Female Reproductive System

Histology for Pathology Female Genital Tract and Breast

FEMALE REPRODUCTIVE SYSTEM

OVARIAN AND UTERINE CYCLES

Do Now Name three organs of the female reproductive system

Female Reproductive function and cycles

Hormones of the female reproductive cycle: Anterior pituitary gland: Follicle stimulating hormone (FSH): Stimulates growth of ovarian follicles, and estrogen.

The Reproductive System of female Oviducts and Uterus 1. Female system not completely closed 2. Egg cell released into abdominal cavity near oviduct—

OVARIAN AND UTERINE CYCLES

THE FEMALE REPRODUCTIVE CYCLES These are the rhythmic changes in the ovary and uterus during the female fertility period (from 15 – 45 years). These cycles.

Pituitary Gland FSH Primordial follicles Growing follicles LH.

C) The Menstrual Cycle The female menstrual cycle takes an average of 28 days. (Variation is common). The cycle occurs in four phases if no fertilization.

Ovulation and Menstruation. Function of Menstrual Cycle Uterine walls thickens with rich blood supply in preparation for a fertilized egg If fertilization.

 Follicle Stimulating Hormones (FSH) and Luteinizing Hormone (LH)- released in the pituitary gland.  Estrogen- Development of the female secondary sexual.

The Male Reproductive System

Reproductive Hormones

Menstruation IF fertilization does NOT take place Menstrual cycle – a series of changes controlled by hormones that help prepare the female uterus for.

Lecture 20 PHYSIOPATHOLOGY OF THE FEMALE REPRODUCTIVE SYSTEM.

THE FEMALE REPROCUCTIVE TRACT Lecture #2. I. THE GOAL A. To produce a sex cell (egg) to unite with a sperm cell to create a new organism. B. To maintain.

Follicular maturation Puberty: – ______________________ secretes increased amounts of ___________….ovaries enlarge. – Oocyte of a follicle enlarges and.

FEMALE REPRODUCTIVE SYSTEM

FEMALE REPRODUCTIVE SYSTEM

Female Reproduction  The most important part of the female reproductive system are the ovaries.

Female Reproductive System

Lab 43 - Gametogenesis and the female cycles. Vagina External os Cervical canal Internal os Wall of uterus Perimetrium Myometrium Endometrium Round ligament.

Which came first - the chicken or the egg? Physiology of Reproduction Jennifer McDonald DO.

NOTES: CH 46, part 2 – Hormonal Control / Reproduction.

Accelerated Biology.  Some important vocabulary  Follicle – a cluster of cells that surrounds an immature egg and provides it with nutrients (where.

Objectives By the end of this lecture, you should be able to: 1. List the hormones of female reproduction and describe their physiological functions 2.

Reproductive System Cont. Female Anatomy & Physiology Chapter 28.

Reproductive Hormones. Male gonads (testes) produce sperm. Female gonads (ovaries) produce eggs.

FEMALE REPRODUCTIVE SYSTEM Dr. Ayisha Qureshi Assistant Professor MBBS, Mphil.

Female Reproductive System

Reproductive Hormones. Male gonads (testes) produce sperm. Female gonads (ovaries) produce eggs.

Organismal Development Part 4

Female Reproductive Cycle

Female Reproductive Cycle

Human ovulatory cycle n ~28 days in length n includes menses n ovulation occurs spontaneously n cycles occur throughout the year n one egg produced / month.

Female reproductive system. Atretic follicle: Most ovarian follicles undergo atrasia, in which the follicular cells and oocytes dies and engulfed.

Female Reproductive System Functions: Oocyte Production Receive Sperm Develop Offspring Deliver Offspring.

Female Reproductive Hormone Cycles. The Human Female Reproductive System The ovaries are where meiosis occurs and where the secondary oocyte forms prior.

At end of this study, students should be able to;

L13: OVULATION TO IMPLANTATION Dr. FARHAT AAMIR. At the end of this session, the student should be able to: Discuss ovarian cycle with ovulation and formation.

The Female Reproductive System Chapter 48. The Ovaries Produce both the egg cells and sex hormones Made primarily of connective tissue and held in place.

Objective To describe the process of oogenesis, the ovarian cycle, and the uterine cycle.

Aim: How can hormones influence the reproductive cycles in humans?

Aim: How can hormones influence the reproductive cycles in humans? Do Now: Using the diagrams below, which structures produce hormones? What hormones are.

Menstrual Cycle. Menstrual Cycle pertains to regular cyclic changes in reproductive organs of females with the onset of puberty & Menstruation is the.

Reproduction A Chemical Signal Balancing Act. Testis signaled to make sperm Low Testosterone in blood detected by Hypothalamus Low Testosterone in blood.

The Female Reproductive System. Overview The female reproductive system produces only a limited number of gametes Most structures are located inside the.

The Uterine (Menstrual) Cycle CHRISTIAN CHEW BIOL 260 | TUESDAY LAB | TONINI.

Reproductive System-L3

The First Week of Development: Ovulation to Implantation

FEMale Reproductive System

Lecture 2 Physiology of ovarian cycle

Female Reproductive Cycle In-je University Medical College

The Reproductive System

Reproductive System.

Menstruation IF fertilization does NOT take place

OVARIAN CYCLE By Dr Samina Anjum.

Organismal Development Part 4

Female Reproductive Cycle In-je University Medical College

Reproductive Hormones

Organismal Development Part 4

Female Reproductive system:

Presentation transcript:

OVARIAN CYCLE

SECTION OF OVARY

Females undergo regular monthly reproductive/sexual cycles commencing at puberty. Ovarian cycle Menstrual cycle

These sexual cycles involves the activity of: Hypothalamus Pituitary gland Ovary Uterus Uterine tubes Vagina Mammary glands Function: To prepare the reproductive system for pregnancy

No effect on growth of primordial follicle OVARIAN CYCLE No effect on growth of primordial follicle to primary follicle 15-20 primary follicles Atretic Corpus atreticum

Functions: FSH ESTROGENS Necessary for the growth of primary, secondary & tertiary follicles Stimulates maturation of granulosa cells (GDF9) Estrogens is Produced by: theca interna cells anderostendione + testosterone granulosa cells convert them into estrone & 17B-estradiol. ESTROGENS Prepares the uterine endometrium to enter into proliferative phase Thinning of cervical mucus Stimulates the pituitary gland to secrete LH

Cont… PROGESTERONE LH Surge Brings secretory changes in the uterine endometrium Prepares the uterus for implantation of embryo LH Surge Elevates the concentration of MPF causing oocyte to complete Meiosis I and initiate Meiosis II. Stimulates production of Progesterone by the follicular cells (luteinization) Causing follicular rupture & ovulation Arrested in metaphase When secondary follicle is mature, LH surge induces a preovulatory growth phase

OVULATION (Release of secondary oocyte) Prior to ovulation secondary follicle grows rapidly (25mm) under influence of FSH & LH At the same time abrupt increase in LH causes Meiosis I to complete and follicle to enter preovulatory stage, Meiosis II initiated and arrested in metaphase 3hrs prior to ovulation

Cont… Increase in volume & pressure of follicular fluid Overlying ovarian cortex become thin & translucent Surface of ovary bulge locally: stigma formation High concentration of LH, increased collegenase activity that digests collagen fibers around follicle and increased PG levels increases muscular contractions of ovarian wall Oocyte along with granulosa cells break free (ovulation) . Rearrangement of cumulus oophorus cells around ZP forms corona radiata.

OVULATION Surgeons who were performing hysterectomy witnessed spontaneous ovulation and were lucky to record it. Ovulation was not an explosive event as it is assumed but rather a 15 min long and smooth release of an egg.

OVULATION SYMPTOMS Middle pain (Mittelschmerz): Rise in basal body temperature

Corpus Luteum (LH) After ovulation, Follicle collapses Granulosa and theca interna cells hypertrophy, leutenized & vasularized Secretes Progesterone some estrogens. Causes uterine mucosa to enter into progestational phase.

OOCYTE TRANSPORT Sweeping movements of fimbriae Rhythmic muscular contractions of tube Motion of cilia in tubal mucosa Fluid currents Fertilized oocyte reaches uterine lumen in 3-4 days

Corpus albicans (Absence of HCG) Latin for "whitening body“ is the regressed form of the corpus luteum. As the corpus luteum is being broken down by macrophages, fibroblasts lay down type I collagen forming the corpus albicans. The remains of the corpus albicans may persist as a scar on the surface of the ovary.

Thank you