Female Reproductive System

Puzzle Piece 23: Female Reproductive System Introduction

  • Reproductive System Functions

    • Produces, stores, nourishes, and transports gametes for fertilization. 💖

    • Gametes: Reproductive cells also known as sex cells. 🧬

  • Gonads: Responsible for producing gametes and sex hormones. ✨

    • Testes: Male gonads that produce sperm (male sex cell) and testosterone hormone. 🍆

    • Note: Testis is singular; testes are plural.

    • Ovaries: Female gonads that produce eggs (female sex cell) as well as estrogen and progesterone hormones. 🥚

  • Fertilization: The fusion of male and female gametes resulting in a zygote with 46 chromosomes (23 from the female egg and 23 from the male sperm). 🌱

Female Reproductive System Overview

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

    • External Genitalia (external organs):

    • Mons Pubis: Rounded mass of fat beneath the skin, anterior to the pubic symphysis. 🍑

    • Clitoris: Equivalent to corpus cavernosum erectile tissue in males. 💡

      • Engorges with blood during arousal. 🔥

      • Similar to the penis, the tip of the clitoris is called the glans, surrounded by the prepuce.

    • Labia Majora: Equivalent to the scrotum in males. 🛡

      • Covered by thin skin with hair.

      • Contains a mass of corpus spongiosum erectile tissue known as the bulb of the vestibule, which engorges with blood during arousal. 💖

      • Located on each side of the vaginal orifice; behind it is the greater vestibular gland, akin to the male bulbourethral gland.

    • Labia Minora: Equivalent to the ventral shaft of the penis.🦋

      • Smaller, thinner, more pigmented than labia majora.

      • Located medially to labia majora; encloses the vestibule, containing the external urethral orifice and the vaginal orifice.

      • Anteriorly, the labia minora join to form the prepuce, covering the clitoral glans.

    • Vulva: The collective term for all structures of the female external genitalia. ✨

Internal Female Reproductive Organs

  • Ovaries: Female gonads releasing eggs monthly post-puberty. 🥚

  • Uterine Tubes (Fallopian tubes): Capture and transport mature eggs toward the uterus. 💫

  • Uterus: Muscular pear-shaped organ where a fertilized egg implants and develops into a fetus. 🍐👶

  • Vagina: Muscular canal connecting the uterus to external genitalia. 🌸

  • Accessory Glands: Secrete fluids into the ducts. 💧

    • Greater Vestibular Glands: Equivalent to bulbourethral glands in males.💦

    • Lesser Vestibular Glands: Equivalent to prostate gland in males. 💧

Production and Storage of Eggs in Females

  • Females are born with all the eggs they will have throughout their lives. 👧🥚

  • Upon reaching puberty, a mature egg is released monthly, halting with menopause. 🗓

  • Witty Tip: A female's eggs are produced during embryonic development while she is in her mother’s womb, implying that the fertilized egg that leads to a female was inside her grandmother's womb at one point. 🤯 matrilineal magic!

Female Accessory Glands

  • Greater Vestibular Glands (Bartholin’s Glands):

    • Secrete mucus near the vaginal orifice during sexual arousal. 💧

  • Lesser Vestibular Glands (Skene’s Glands/Paraurethral Glands):

    • Secrete milky white fluid during arousal from the urethra, believed to help prevent urinary tract infections. ✨

    • Witty Tip: The secretion involves both urine and secretion from the lesser vestibular glands, referred to as female ejaculation or squirting orgasm. 💦💥 This is why some refer to it as "squirting"!

Female Pelvic Area

  • Mons Pubis: Cushions between skin and pubic bones (fatty tissue). 🍑

  • Organ Locations:

    • Urinary bladder is superior to the uterus; urethra extends inferiorly. ⬆bladder⬇urethra

    • Rectum runs parallel and posterior to the vaginal canal. 📏

    • Ovaries, uterine tubes and uterus are positioned within the pelvic cavity. 🧭

Uterus Anatomy

  • A pear-shaped, muscular organ suspended by ligaments. 🍐💪

Uterine Ligaments

  • Uterosacral Ligament: Attaches the uterus to the sacral region, preventing anterior movement. 🔙

  • Round Ligament: Extends anteriorly through the inguinal canal, preventing posterior movement. ➡

  • Cardinal Ligament: Runs transversely, preventing inferior movement. ↔⬆

  • Broad Ligament: Encloses the uterus, uterine tubes, and ovarian hilum. 🦋

    • Divided into parts:

    • Mesometrium: Surrounds the uterus; the largest part. encompassing

    • Mesovarium: Encloses the hilum of the ovary but not its surface. 🛡

    • Mesosalpinx: Above the mesovarium, encloses the uterine tubes. 🚀

Pregnancy and Uterine Changes

  • The fertilized egg implants in the inner lining of the uterus. 🐣

    • The uterus requires considerable growth to handle a developing fetus. 📈 expansion module activated!

    • Anatomically divided into three regions:

    • Fundus: Rounded upper portion. 🎈

    • Body: Main portion for embryo implantation. 🏠

    • Cervix: Lowest portion closest to the vagina. 🚪

      • Contains the cervical canal. 🛣

Cervical Canal Features

  • Internal Os: End close to the uterine cavity. 🏡

  • External Os: End close to the vaginal canal. 🏞

Witty Tips about the Cervix

  • Tip 1: The internal os faces the uterine cavity; external os faces the vaginal canal. 🤫 Internal is 'in', external is 'exit'.

  • Tip 2: The cervical canal remains closed during pregnancy but dilates up to 1010 cm during childbirth. 🔓🚪 Think of it as opening a door for the baby!

  • Tip 3: A Pap smear involves scraping cells from the cervix to check for abnormalities. 👩‍⚕ Early detection is key!

Uterine Wall Layers

  • Perimetrium: Outermost serous layer, allows for movement. 🤸‍♀

  • Myometrium: Thick muscle layer, contracts during labor and menstruation. 💪

  • Endometrium: Inner layer that undergoes cyclic hormonal changes corresponding to the menstrual cycle. 🌸

    • Composed of two layers:

    • Functional Layer: Grows and sheds during the menstrual cycle. ♻

    • Basal Layer: Base for regenerating the functional layer. 🏗

Uterine Cycle (Menstrual Cycle)

  • Influenced by Hormones: Estrogen and progesterone released by ovaries. 🦋

  • Phases:

    • Menstrual Phase (Days 1−71-7): Shedding of endometrial tissue due to low hormone levels, blood loss of 1.21.2 to 1.71.7 ounces. 🩸

    • Proliferative Phase (Days 8−148-14): Triggered by increasing estrogen levels; endometrium rebuilds for a potential fertilized egg. 🌱

    • Secretory Phase (Days 14−2814-28): Triggered by high progesterone levels after ovulation, where the functional layer prepares for implantation. 🤫 Secretly waiting!

Menstrual Disorders

  • Dysmenorrhea: Painful periods. 😫

  • Menorrhagia: Heavy menstrual bleeding. 🌊

  • Amenorrhea: Absence of menstruation. ⏸

Ovary Overview

  • The ovary is the female gonad. 🥚

    • Oogenesis: Process of producing eggs; females are born with all primary oocytes. 🐣

    • Upon puberty, primary oocytes mature into secondary oocytes each month and are released during ovulation. 🎯

Ovarian Structures

  • Primordial Follicle: Contains primary oocyte; develops into larger follicles as the oocyte matures. 🌟

  • Tunica Albuginea: The fibrous capsule surrounding the ovary. 🛡

  • Ovarian Cortex: Contains primary and growing oocytes. 🌳

  • Ovarian Medulla: Houses blood vessels, nerves, and lymphatic vessels. 🚦

Ovarian Ligaments

  • Ovarian Ligament: Attaches ovary to uterus. 🔗

  • Suspensory Ligament: Extends to lateral abdominal wall, containing blood vessels. 🕸

Ovarian Cycle

  • Governed by hormones, primarily FSH and LH from the anterior pituitary gland. 🚦

  • Phases:

    • Follicular Phase (Days 1−141-14): FSH stimulates follicle growth leading to estrogen release. ⬆ Estrogen!

    • Luteal Phase (Days 14−2814-28): After ovulation, corpus luteum forms, secreting progesterone to prepare for potential pregnancy. 🟡🤰

Uterine Tube Anatomy

  • Transports the mature egg to the uterine cavity and is involved in fertilization, typically occurring in the ampulla. 🚀💖

  • Structure: Mucosa, smooth muscle, changed during the ovarian cycle. 🌊💪

  • Regions: Isthmus, ampulla, infundibulum, fimbriae. Catching the egg! 🎣

Summary: Chain of Command in Reproductive Cycle

  • Brain regulates ovarian hormones, which in turn affect the uterine function during the menstrual cycle. 🧠➡🥚➡ uterus

  • Ends with ovulation and culminates in preparation for conception, or if not fertilized, degradation of uterine lining, beginning the cycle anew. 🔄

Vagina Overview

  • The vaginal wall: Non-keratinized stratified squamous epithelium for protection. 🛡

  • Functions include passageway for menstruation, receiving penis during intercourse, and being a part of the birth canal. 🧘‍♀

  • Contains rugae for expansion during various activities. 🎈

  • Vaginal Opening: Vaginal orifice covered by hymen, which can be ruptured during first intercourse or physical activity. 🚪

Female Breasts Anatomy

  • Support Structure: Suspensory ligaments hold breasts in place, primarily composed of adipose tissue. 🍈🍈

  • Mammary Glands: Produce milk; divided into lobes draining into sinuses at the nipple. 🥛

    • Hormones: Prolactin stimulates milk production, while oxytocin facilitates milk release. 🤱

    • Involution: Uterus contracts post-breastfeeding to return to pre-pregnancy size. ↩

  • Breast Health: Importance of self-exams and mammography for cancer screening. 🎗💖