•production of gametes •production of female sex hormones...
TRANSCRIPT
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Functions of the Female Reproductive System
• Production of gametes
• Production of female sex hormones
• Embryo/fetus
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Ovarian Function and SupportOvarian arteryOvarian veinSuspensoryligament
Infundibulum
Fimbriae
Ovary
Ureter
Cervix
Vagina
Ovarian ligament
Uterine tube
Uterus
Broad ligament
External os
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Ovarian SupportPosterior
Uterine tube
Tunica albuginea
CortexMedulla
AnteriorGerminal epitheliumHilum
Mesovarium
Mesosalpinx
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Ovarian Blood Supply
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Germinal Epithelium
Tunica albuginea
Ovarian Surface
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Ovarian Cortex and Medulla
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Ovarian Follicles• Developing oocyte surrounded by one or
more layers of supporting cells.
• Types:– Primordial
– Primary
– Secondary
– Graafian.
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Primary Follicles
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Secondary Follicles
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Graafian Follicle
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Uterine Tubes• Initial portion of duct system.• Extends btwn uterus & ovary• Supported by mesosalpinx• Receives ovulated oocyte
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Uterus• Receives, retains,
nourishes and expels
• Anterior to rectum
• Posterosuperior to the urinary bladder
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Fundus
Uterus – 3 Main Regions
Body
Cervix
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Anteverted vs. Retroverted Uterus
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Uterine cavity
Internal osCervical canal External os
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Uterus Ligament Support
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Pelvic and Urogenital Diaphragm
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– Perimetrium– Myometrium– Endometrium.
Layers of the Uterine Wall
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Layers of the Endometrium
• Stratum functionalis – Superficial– Changes in response to:– Shed during…
• Stratum basalis – Thinner and deeper – Unresponsive– Forms a new…
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Epithelium
Uterineglands
Functionallayer
Endometrium
Basallayer
Myometrium
Lumenof uterus
LM 4
5x
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Vagina• Extends from cervix
to vestibule
• Receives penis
• Provides exit for
menses & babies
• Hymen
• Vaginal fornices
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Nonkeratinizedstratifiedsquamousepithelium
Mucosa
Laminapropria
Muscularis
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• Vulva:• Mons pubis
• Labia majora
• Labia minora
• Vestibule
• Clitoris.
External Genitalia
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Pubic symphysis
Labia minoraClitoris
Labia majora
Anus Body of clitoris, containing corpora cavernosa
Clitoris (glans)Crus of clitoris
Urethral orifice
Vaginal orificeGreatervestibulargland
Fourchette
Bulb ofvestibule
Inferior ramus of pubis
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Mammary Glands
• Milk production.
• 15-25 lobes.
• Suspensory ligament of the breast.
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Mammary Glands
• Alveoli.
• Lactiferous ducts.
• Lactiferous sinus.
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Oogenesis
Oogonium
Mitosis
Lots of oogonia
In the fetus.
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Oogonium
Replicates its DNA
Still in the fetus.
Primary Oocyte
At this point, the primary oocyte would be part of a primordial follicle
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Still in the fetus.
Primary Oocyte
Begins the first division of meiosis but gets BLOCKED
A primary oocyte will remain stuck in meiosis I unless/until it receives the appropriate hormonal signal during the menstrual cycle.
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Primary Oocyte
In response to LH at the midpoint of each menstrual cycle, a single primary oocyte completes its first division.
The resulting secondary oocyte is ovulated.
Secondary Oocyte
First polar body
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23
23
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Secondary Oocyte
IF AND ONLY IF it is fertilized by a sperm, it will undergo the second division of meiosis.
Ovum – containing both the male and female pronuclei
Second polar body
23
2323
23
23
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The pronuclei fuse togetherZygote with a diploid nucleus23
46
23
Ovum – containing both the male and female pronuclei
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Ovarian Cycle (28days)
Follicular Phase (days 1-14)
Luteal Phase (days 14-28)
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Ant. Pituitary releases FSH and LH
Follicular Phase Part 1 – Days 1-7
Hypothalamus releases GnRH
Follicle growth
Growing follicles secrete estrogen
Estrogen prepares the uterus for
pregnancy
Estrogen causes the anterior
pituitary to store FSH and LH
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FSH
LH
Progesterone
Estrogens
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Follicular Phase Days 7-14 Estrogen levels continue to rise
FSH levels and LH levels continue to fall
Follicle growth continues
Estrogen levels continue to rise
FSH levels and LH levels continue to fall
On average, only one follicle successfully finishes maturation and becomes graafian
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FSH
LH
Progesterone
Estrogens
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Ovulation – Day 14
Estrogen levels reach threshold
Ant. pituitary releases stored FSH & LH
Surge in plasma LH causes:
Primary oocyte to complete meiosis I
Secondary oocyte to be ovulated
Remainder of graafian follicle to be
transformed into corpus luteum
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FSH
LH
Progesterone
Estrogens
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Luteal Phase Part 1 – Days 14-24
Corpus luteum secretes progesterone
Plasma progesterone levels rise
Uterine lining becomes more
vascular and more glandular
Progesterone inhibits release of LH and FSH from anterior pituitary
Prevents further follicular development
or ovulation
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FSH
LH
Progesterone
Estrogens
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Luteal Phase Part 2 – Days 24-28If pregnancy does not occur
Progesterone levels rise higher and
higher
Plasma LH levels fall lower
and lower
When LH levels reach threshold, corpus luteum begins to degenerate
Corpus luteum dies and becomes a mass of whitish scar
tissue (corpus albicans)
W/o a corpus luteum, progesterone levels fall
Once progesterone levels have fallen:
LH and FSH begin to be released from anterior
pituitary
Uterine lining will begin shed
Another cycle will begin
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What if pregnancy does occur?
Developing placenta
produces HCG
HCG binds to the corpus luteum and keeps it alive
(for a few months, until the placenta is able to take
over)
Progesterone levels stay high
Uterine lining stays intactPreventing further follicular development or ovulation.
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Uterine Cycle
• Changes in the uterine lining caused by the changing levels of ovarian hormones
• 3 phases– Menstrual Phase (Days 1-5)
– Proliferative Phase (Days 6-14)
– Secretory Phase (Days 14-28)
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Uterine Cycle – menstrual phase• Days 1-5
• Plasma progesterone levels plummet. Why?
• Stratum functionalis is shed. Detached blood and tissue sloughs out of the vagina
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Uterine Cycle – proliferative phase
• Days 6-14
• Plasma estrogen levels are…
• Stratum functionalis of the endometrium gets…
• What’s happening to cervical mucus?
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Uterine Cycle – secretory phase
• Days 14-28
• Plasma progesterone levels are…
• Stratum functionalis of the endometrium gets…
• What’s happening to cervical mucus?
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Extrauterine Effects of Ovarian Hormones
• Estrogen– Promotes bone lengthening
and epiphyseal plate closure
– Inhibits bone resorption
– Promotes skin hydration
– Stimulates female pattern of fat deposit and hair growth
– ↑ retention of sodium and water
– Raises HDL cholesterol levels and reduces LDL cholesterol levels
• Progesterone– Increases body
temperature
– Promotes urination
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Other Important Terms & Events• Puberty – period of life in which the reproductive organs
become adult size and functional
• Menarche – 1st menstrual period
• Menses – normal flow of blood & tissue during menstruation
• Amenorrhea – abnormal cessation of menstruation
• Menopause – normal cessation of menstrual function that usually occurs in the 5th or 6th decade
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