APARATO REPRODUCTOR FEMENINO- Cotamania

Introduction to the Female Reproductive System

In this section, the instructor introduces the topic of the female reproductive system and provides an overview of its components.

Definition and Components of the Female Reproductive System

• The female reproductive system consists of both external and internal genital organs.

• External genital organs include the vulva, which comprises the labia majora, labia minora, clitoris, and mons pubis.

• Internal genital organs include the vagina, uterus, fallopian tubes (oviducts), and ovaries.

• The female reproductive system works in conjunction with the male reproductive system to ensure human reproduction.

Genital Organs - External Structures

This section focuses on the external structures of the female reproductive system.

Vulva and its Components

• The vulva refers to the external genital organs in females.

• It includes structures such as the labia majora, labia minora, clitoris, mons pubis, and vestibule.

• The labia majora are two folds of skin that contain adipose tissue and sebaceous glands. They are pigmented and may have pubic hair.

• The labia minora are smaller folds of skin located within the labia majora. They are smooth, less pigmented, and do not have pubic hair.

• The clitoris is an erectile organ located at the upper junction of the labia minora. It has a significant nerve supply and plays a role in sexual sensation.

• The vestibule is a space between the labia minora where various glands and openings can be found.

Detailed Study of External Genital Organs

This section provides a detailed study of the external genital organs, focusing on the functions and characteristics of each structure.

Mons Pubis

• The mons pubis is an adipose elevation covered with coarse pubic hair.

• It serves to cushion the pubic symphysis during sexual activity and may also play a role in attracting a partner through scent.

Clitoris

• The clitoris is an erectile organ located at the upper junction of the labia minora.

• It extends internally and is one of the most innervated structures in the female reproductive system, contributing to sexual sensation.

Labia Majora and Labia Minora

• The labia majora are two folds of skin that contain adipose tissue, sebaceous glands, and pubic hair.

• They are pigmented, rugose (wrinkled), and provide protection for the internal genital organs.

• The labia minora are smaller folds of smooth skin within the labia majora. They lack pubic hair and have less pigmentation.

Vestibule

• The vestibule refers to the space between the labia minora.

• It contains various glands and openings related to reproductive functions.

External Glands

This section focuses on the external glands associated with the female reproductive system.

Skene's Glands (Paraurethral Glands)

• Skene's glands, also known as paraurethral glands or lesser vestibular glands, are two branched glands located parallel to the female urethra.

• They are situated on both sides of the vagina within the vestibule.

• These glands have a similar function to that of male prostate gland.

Bartholin's Glands

• Bartholin's glands are two pea-sized glands located on either side at the opening of the vagina.

• They secrete mucus to lubricate the vagina during sexual arousal.

Conclusion

The female reproductive system consists of both external and internal genital organs. The external structures include the vulva, which comprises the labia majora, labia minora, clitoris, mons pubis, and vestibule. The internal structures include the vagina, uterus, fallopian tubes, and ovaries. Understanding the anatomy and functions of these components is essential for a comprehensive study of the female reproductive system.

The Role of Skin Glands in Female Genitalia

This section discusses the presence and function of the Skin glands in the female genitalia.

Skin Glands and their Location

• The Skin glands are small secretory glands located around the urethra.

• They secrete a small amount of fluid to lubricate the vaginal lips during sexual activity.

Homology with Male Genitalia

• The Skin glands are homologous to certain glands in males, such as the prostate gland.

• The Bartholin's gland, located around the vagina, is homologous to Cooper's gland in males.

Introduction to Vaginal Openings

This section explains the different openings and structures associated with the female genitalia.

Introito Uretral and Introito Vaginal

• The introito uretral refers to the final opening of the urethra.

• The introito vaginal is the opening that leads into the vagina.

• The introito vaginal is covered by a vascularized mucous membrane called hymen, which can be partially or completely covering.

Function and Characteristics of Hymen

This section discusses the function and characteristics of hymen, a membrane present at the entrance of the vagina.

Hymen Function

• The hymen allows for menstrual flow through its perforations.

• During sexual intercourse, it may tear or stretch, causing slight bleeding known as "breaking" or "rupturing" of hymen.

Homology with Male Genitalia

• The glans de Skene (Skin gland) is homologous to male prostate gland.

• Bartholin's gland is homologous to Cooper's gland in males.

Homologies of Female Genitalia with Male Genitalia

This section explains the homologous structures between female and male genitalia.

• The clitoris is homologous to the penis.

• The labia majora are homologous to the scrotum.

• The labia minora are homologous to the spongy urethra.

• The glans de Skene (Skin gland) is homologous to the prostate gland.

• Bartholin's gland is homologous to Cooper's gland.

Types of Hymen

This section discusses different types of hymen based on their appearance and characteristics.

Different Types of Hymen

• Multiparous hymen indicates a woman who has given birth multiple times.

• Cribriform hymen has small perforations resembling a sieve.

• Anular hymen forms a complete ring around the vaginal opening.

• Imperforate hymen completely blocks the vaginal opening, requiring medical intervention for menstruation or sexual activity.

Medical Interventions for Imperforate Hymen

This section explains how imperforate hymens can cause discomfort and require medical intervention.

Symptoms and Treatment

• Adolescents may experience discomfort due to an imperforate hymen, leading to absence of menstruation or pain during gynecological examination.

• A gynecologist may perform an incision to create an opening in the imperforate hymen, relieving symptoms.

Internal Female Genital Organs

This section provides an overview of internal female genital organs.

Vagina

• The vagina is a canal that serves as the copulatory organ and birth canal.

• It is lined with non-keratinized stratified squamous epithelium.

• The pH inside the vagina is acidic (3.5 to 4.5) for protection against infections.

Epithelium and Length of Vagina

This section discusses the epithelium and length of the vagina.

Epithelium and Length

• The internal part of the vagina is lined with non-keratinized stratified squamous epithelium.

• The average length of the vagina is approximately 7 to 10 centimeters.

Acidic pH of Vagina

This section explains why the pH inside the vagina is acidic.

Protective Function

• The acidic pH inside the vagina helps protect against infections.

• Due to its proximity to other body openings, such as the anus, maintaining an acidic environment prevents bacterial colonization.

Infections and Hygiene

This section highlights how poor hygiene practices can lead to vaginal infections.

Risk Factors

• Lack of proper hygiene or improper cleaning can introduce fecal bacteria into the vaginal area.

• Proximity to other body openings makes it susceptible to infection if not cleaned properly.

The Role of pH in the Vagina

This section discusses how the acidity of the vagina, maintained by lactobacillus bacteria, prevents the survival of harmful bacteria like Escherichia coli. It also explains how semen, which has an alkaline pH, neutralizes the vaginal environment and allows for conception.

pH and Vaginal Acidity

• The acidity of the vagina is maintained by lactobacillus bacteria.

• These bacteria feed on glycogen found in the vaginal surface, producing lactic acid and acidifying the environment.

• The acidic pH prevents harmful bacteria like Escherichia coli from surviving in the vagina.

Semen and Conception

• Semen contains alkaline fluids that counteract the acidity of the vagina.

• When sperm enters the vagina, it is protected by this alkaline environment.

• The alkalinity of semen allows for conception to occur.

Understanding the Uterus

This section provides an overview of the uterus, its shape, size, and different parts. It also explains how fertilization occurs in the fallopian tubes before implantation in the uterus.

Anatomy of the Uterus

• The uterus has a pear-like shape with a narrow upper part called "the fundus" and a wider lower part called "the body."

• Another important part is "the cervix," which can be seen during gynecological examinations using a speculum.

Layers of the Uterus

• The outermost layer is called "perimetrium," followed by a thick muscular layer called "myometrium."

• The innermost layer is known as "endometrium," which undergoes cyclic changes during menstruation.

Menstruation and Implantation

• The endometrium has two layers: the functional layer and the basal layer.

• The functional layer is shed during menstruation, while the basal layer regenerates a new functional layer.

• Fertilization occurs in the fallopian tubes, and the resulting blastocyst implants itself in the uterus.

Understanding Endometrial Layers

This section focuses on the different layers of the endometrium and their functions. It explains how these layers undergo cyclic changes during the menstrual cycle.

Layers of the Endometrium

• The endometrium consists of two main layers: the functional layer and the basal layer.

• The functional layer is responsible for menstruation and undergoes cyclic changes.

• The basal layer serves as a source for regenerating a new functional layer.

Menstrual Cycle

• Every 28 days, if fertilization does not occur, the functional layer is shed as menstrual bleeding.

• After shedding, the basal layer regenerates a new functional layer for future cycles.

Understanding Fallopian Tubes

This section provides an overview of fallopian tubes, their structure, and their role in fertilization. It also explains how they capture secondary oocytes released from ovaries.

Anatomy of Fallopian Tubes

• Fallopian tubes are also known as oviducts.

• They have three parts: intramural, isthmus, ampulla, and infundibulum with fimbriae.

Function of Fallopian Tubes

• The inner lining of fallopian tubes has ciliated epithelial cells that help move secondary oocytes towards the uterus through peristaltic contractions.

• The outermost serosa is continuous with peritoneum.

Fertilization and Implantation

• Fertilization occurs in the ampulla, the outer third of the fallopian tube.

• The fimbriae at the infundibulum capture secondary oocytes released from ovaries.

Fertilization and Embryo Transport

This section explains how fertilization occurs in the fallopian tubes and how the embryo is transported to the uterus for implantation. It also mentions the risk of ectopic pregnancy if implantation occurs outside of the uterus.

Fertilization in Fallopian Tubes

• Fertilization occurs in the outer third (tercio externo) of the fallopian tube.

• After fertilization, the zygote undergoes cell division and becomes a blastocyst.

Embryo Transport to Uterus

• The blastocyst is transported from the fallopian tubes to the uterus.

• If implantation were to occur in the fallopian tubes, it would result in an ectopic pregnancy, which can be dangerous.

Timestamps are approximate and may vary slightly.

Female Reproductive System Overview

This section provides an overview of the female reproductive system, focusing on the ovaries, fallopian tubes, and uterus.

Ovaries and Fallopian Tubes

• The ovaries release an ovum (egg), which is the female gamete.

• The fallopian tubes have three sections: external, middle, and internal.

• Fertilization occurs in the external section of the fallopian tube.

Endometrium Layers

• The endometrium has two layers: basal and functional.

• During menstruation, the functional layer sheds while the basal layer remains.

• Menstruation is characterized by bleeding due to shedding of the functional layer.

Menstrual Cycle Phases

• Menstruation is followed by the proliferative phase where the functional layer regenerates under estrogen stimulation.

• The secretory phase occurs after ovulation when the functional layer becomes highly vascularized and edematous under estrogen and progesterone stimulation.

Menstruation and Hormonal Changes

This section explains menstruation as well as hormonal changes that occur during different phases of the menstrual cycle.

Menstruation Process

• Menstruation is the shedding of the functional layer of the endometrium.

• It is triggered by a sudden decrease in ovarian hormones (estrogen and progesterone).

• The menstrual flow consists of both shed tissue and some blood due to arterial damage.

Proliferative Phase

• In this phase, under estrogen stimulation from developing ovarian follicles, the basal layer forms a new functional layer.

Secretory Phase

• After ovulation, during this phase, both estrogen and progesterone stimulate further thickening of the functional layer.

• The functional layer becomes highly vascularized and edematous.

Ovulation and Menstrual Cycle Recap

This section recaps the menstrual cycle, focusing on ovulation and the phases of the endometrium.

Ovulation

• Ovulation occurs around day 14 of a 28-day menstrual cycle.

• It marks the release of an egg from the ovary and initiates the secretory phase of the endometrium.

Secretory Phase Recap

• The secretory phase follows ovulation and is characterized by a highly vascularized and edematous functional layer.

• Estrogen and progesterone, produced by the corpus luteum in the ovaries, stimulate this phase.

Summary of Menstruation Phases

This section provides a summary of the different phases of menstruation, including hormonal changes and their effects on the endometrium.

Menstruation Phase

• Shedding and decrease in volume of functional layer due to decreased estrogen and progesterone levels.

Proliferative Phase

• Regeneration of functional layer from basal layer under estrogen stimulation from developing ovarian follicles.

Secretory Phase

• Thickening, increased vascularity, and edema in functional layer under estrogen and progesterone stimulation from corpus luteum.

Overview of Ovarian Cycle

In this section, the speaker provides an overview of the ovarian cycle and explains the different stages involved.

Ovarian Follicles

• Ovaries contain follicles that produce ovocytes.

• Follicles evolve from primordial to primary to secondary to mature.

• Mature follicles release the secondary ovocyte during ovulation.

Corpus Luteum Formation

• After ovulation, the mature follicle becomes corpus luteum.

• Corpus luteum produces progesterone and eventually transforms into corpus albicans.

Components of Ovary

• The ovary consists of epithelial covering, germinal epithelium, albuginea (connective tissue), stroma (vascularized tissue), and cortex.

• The ovarian cycle is divided into follicular phase, ovulatory phase, and luteal phase.

Hormones and Stages

• FSH (follicle-stimulating hormone) and LH (luteinizing hormone) stimulate follicular development.

• The primary function of estrogen is produced by secondary follicles.

• LH triggers ovulation and causes the release of secondary oocytes.

• Progesterone is released by corpus luteum during the luteal phase.

Menstrual Cycle vs. Ovarian Cycle

This section compares the menstrual cycle with the ovarian cycle and explains their differences.

Menstrual Cycle Duration

• The menstrual cycle lasts from day 1 to day 28.

• The ovarian cycle occurs in the middle of the menstrual cycle on day 14.

Endometrium Layers

• The endometrium consists of the basal layer and the functional layer.

• The functional layer undergoes menstrual, proliferative, and secretory phases.

Hormonal Regulation

• Each phase of the menstrual cycle is regulated by specific hormones.

• FSH and LH stimulate follicular development in the ovarian cycle.

• LH triggers ovulation, while progesterone is released during the luteal phase.

Visual Explanation of Ovarian Cycle

In this section, a visual representation of the ovarian cycle is provided for better understanding.

Understanding the Image

• The image shows both the menstrual cycle and ovarian cycle together.

• The endometrium, consisting of basal and functional layers, is depicted.

• Different phases of the menstrual cycle are labeled: menstrual, proliferative, secretory.

Due to language limitations, some details may be missing from this summary. Please refer to the transcript for complete information.

Menstrual Cycle Phases

This section discusses the different phases of the menstrual cycle and their hormonal changes.

Menstrual Phase

• The menstrual phase is characterized by low levels of estrogen and progesterone.

• The endometrial lining sheds during this phase.

Proliferative Phase

• The proliferative phase is stimulated by estrogen.

• The basal layer of the endometrium forms a functional layer.

• The functional layer thickens due to estrogen, preparing for potential implantation.

Secretory Phase

• The secretory phase occurs after ovulation.

• It is stimulated by progesterone.

• Progesterone promotes edematization and vascularization of the endometrial lining.

Ovulation

• Ovulation occurs around day 14 of the menstrual cycle.

• It is triggered by an increase in luteinizing hormone (LH).

• Follicle-stimulating hormone (FSH) stimulates follicle development.

Mechanism of Emergency Contraceptive Pills

This section explains how emergency contraceptive pills work to prevent pregnancy.

Effect on Spermatozoa

• Emergency contraceptive pills thicken cervical mucus, preventing sperm from reaching the uterus.

Effect on Ovulation

• These pills inhibit ovulation, preventing the release of an egg from the ovary.

Effect on Fertilization

• If fertilization occurs despite pill use, it prevents implantation in the uterus.

Controversy Surrounding Emergency Contraceptive Pills

This section discusses the controversy surrounding emergency contraceptive pills in certain countries.

• In some countries, such as Peru, emergency contraceptive pills face opposition due to religious beliefs.

• The state's stance on these pills is influenced by Catholicism.

• The speaker believes that the state should be neutral and not influenced by any religion.

Summary of Emergency Contraceptive Pill Mechanisms

This section provides a summary of how emergency contraceptive pills prevent pregnancy.

• Emergency contraceptive pills have two main effects:

• Thicken cervical mucus, preventing sperm from reaching the uterus.

• Inhibit ovulation, preventing the release of an egg from the ovary.

• If fertilization occurs despite pill use, it prevents implantation in the uterus.

The Debate on the Beginning of Life in Peru

In this section, the speaker discusses the different perspectives on when life begins in Peru. The constitutional treaty defines life as beginning at conception, but some women's groups argue that it begins at implantation.

Perspectives on the Beginning of Life

• In Peru, there is a debate about when life begins.

• Some people defend the idea that life starts at conception, while allowing activities like bullfighting and animal fighting.

• The speaker believes that animals can feel pain and have emotions, but they are not in favor of abortion either.

• The speaker concludes by stating their inability to understand or support either extreme perspective.

This section provides an overview of the discussion on when life begins in Peru. The speaker expresses their disagreement with both sides of the debate and highlights their concerns about animal cruelty.