female reproductive system i - masaryk university
TRANSCRIPT
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Female reproductive system I
• Oogenesis
• Microscopic structure
Ovarium (ovary)
Tuba uterina (oviduct)
Uterus
Vagina
Placenta and umbilical cord
• Ovarian and menstrual cycle
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1) Sex gland (gonad): ovarium
2) Excretory ducts:
• oviduct
• uterus
• vagina
3) External genitalia:
• clitoris
• labia majoris et minoris
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Oogenesis
• Process of formation of the oocyte,
the female gamete, in ovaries
• Protective structure necessary for
proper ooycte nutrition, maturation and
ovulation = follicle
• Ovarian cycle is governed by
hormones secreted by hypothalamus-
adepohysis and follicular cells and is
linked to menstrual cycle
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Follicular development – ovarian cycle
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Important terms
• Oogonia (6106 at the end of 5th month i.u.)
• Primary oocyte (2106 at the end of 7th month i.u.)
• Secondary oocyteimmediately enters meiosis II, stop in metaphase and ovulate
• Oocyte is fertilized by a sperm - meiosis II is completed, ovum forms
• Zygote is formed and immediately starts to divide
Meiosis I stopped at late
prophase - dictyotene
Meiosis I completed 48-36
hrs before ovulation
Meiosis II completed after
fertilization
Oogonia mitotically divide
1/3 of oogonia enters meiosis I
Oocyte development
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Spermatogenesis vs. oogeneis
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Ovarium - anatomy
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- germinative epithelium - source of folicular cells
- tunica albuginea ovarii
(0,05 – 0,08 mm)
- cortex (folicles)
- medulla (zona vasculosa, vascularisation)
Ovarium (3 x 1,5 x 1 cm)
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• ovarial follicles:
1. primordial
2. growing: primary unilaminar, primary multilaminar, secondary
3. mature: Graafian follicle
4. atretic (degenerated) follicles
• corpus luteum
• corpus albicans
Ovarium – important terms
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Primordial follicle 40 – 50 μm
- oocyte 25 – 30 μm
- single layer of flat folicular cells
Primary folicle
unilaminar 60 – 75 μm
multilaminar 200 – 250 μm
- oocyte 50 - 80 μm
- zona pellucida (ZP)
- one or more layers of folicular cells
membrana granulosa (MG)
- corona radiata (CR)
- theca folliculi
Secondary follicle 0,2 – 0,8 mm
- oocyte 100 μm
- ZP, MG, CR – cavities
- theca folliculi interna + externa
Graafian follicle 1,5 – 2,0 cm
- oocyte 100 - 150 μm
- ZP, MG, CR – cumulus oophorus,
- antrum folliculi
- theca folliculi interna + externa
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?
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Pre-puberty
Fertility
Post-menopause
Age-related changes in folicular development
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Follicular degeneration – atresia
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Corpus luteum
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Corpus luteum
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Corpus albicans and corpus luteum
Thecalutein cells
-thecal septa
-Granulosalutein cells
-Fibrin clot
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Corpus luteum
Granulosalutein cells
Thecal septa and thecalutein cells
Ovarial stroma
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Hypothalamus
Adenohypophysis
Folicular cells
GnRH
FSH/LH
17β-estradiol
Positive
feedback
Day 1-13
Progesteron
Ovulation
Inhibition and
production of
GnRHCorpus luteum
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i
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e
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Tuba uterina (tuba Fallopi, salpinx, oviduct)
• Tunica mucosa
– simple columnar epithelium
• Cilliated cells
• Noncilliated, peg cells
– lamina propria
• Tunica muscularis
– inner circular
– outer longitudinal
• Tunica serosa
– mesothelium
– lamina propria serosaeinfundibulum + fimbriae ampulla - 2/3 isthmus - 1/3 pars intramuralis (pars uterina)
12-15 cm
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Infundibulum
Fimbriae
Isthmus AmpullaTuba uterina
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Regional differences in oviduct histology
Mucosal folds
Cilliated cells
Peg cells
Tunica muscularis ext.
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Oviduct - ampulla (SEM)
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Tubar epithelium (TEM)
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Tubar epithelium (SEM)
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Oviduct (ampulla) - epithelium
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Tuba uterina - ampulla
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ampulla tubae uterinae X vesicula seminalis
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Tuba uterina – ampulla
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Tuba uterina – ampulla
oocyte
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Tuba uterina - isthmus
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Tuba uterina - isthmus
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Female reproductive system I
Slides
42. Ovarium (Homo, HE)
43. Ovarium (Felis domestica, HE)
44. Corpus luteum (HE)
45. Tuba uterina – pars ampullaris (HE)
46. Tuba uterina – pars isthmica (HE)
Atlas EM:
Primary folicle (1)
Oviduct - epithelium (26, 29, 30)
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Female reproductive system II
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Uterus• Tunica mucosa (endometrium):
epithelium (simple columnar), lamina
propria = stroma + gll. uterinae
zona functionaliszona basalis
• Tunica muscularis ext. (myometrium) spiral smooth muscle fibers
• Tunica serosa (perimetrium)
isthmus uteri
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ENDOMETRIUM
Zona
functio
nalis
Zona
basalis
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Endometrium
epithelium
stroma
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Uterus (proliferation phase
- gll. uterinae
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Myometrium
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Menstrual cycle
• Menstrual phase (Day 1. – 4.)
• Proliferative phase (Day 5. – 15.)
• Secretory phase (Day 16. – 27.)
• Ischemic phase (Day 28.)
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Hormonal regulation of ovarian and
menstrual cycle
• hypothalamus (nucleus arcuatus):gonadoliberin (GnRH)
• hypophysis: gonadotropiny: FSH, LH
• ovarium: estrogens (growing follicles, corpus luteum), progesteron (corpus luteum)
•
uterus
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Endometrium
(proliferative phase):
1 – zona functionalis
2 – zona basalis
Simple columnar epithelium
1
2
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3-4 mm
endometrium
myometrium
Uterus – proliferative phase
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Endometrium – proliferative phase
epithelium
zona functionalis
zona basalis
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M
E
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Endometrium – beginning of secretory phase
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Endometrium
(secretory phase):
1a – pars compacta
1b – pars spongiosa
zona functionalis
2 – zona basalis
1a
1b
2
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Endometrium – secretory phase
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5-7 mm
Uterus – secretory phase
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Endometrium during menstrual cycle:
(post)menstrual phase proliferative phase secretory phasezona basalis (1 mm) + zona functionalis (5 mm) (6 – 7 mm)
pars compacta
pars spongiosa
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Cervix uteri
vagina
porcio vaginalis
cervicis uteri
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Portio vaginalis cervicis uteri
Simple columnar epithelium
Stratified squamous
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Tunica mucosa:
epithelium (stratified squamous),
lamina propria)
Tunica muscularis ext.
Spirally oriented smooth muscle tissue
Tunica adventitia
Vagina
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1, 2
3
4
Vagina - mucosa (HE)
4 – superfitial cells
3 – intermediary cells
2 – parabasal cells
1 – basal cells
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Vagina – Best’s carmine (glycogen)
glycogen + lactobacillus acidophilus (Döderline) -→lactic acid /pH 3.8-4/
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Vaginal cytology
• The vaginal epithelium is responsive to sex steroids (estrogen),
and undergoes changes through the cycle in response to changes in
blood estrogen concentrations. Rising levels of estrogen cause the
vaginal epithelium to become "cornified" - the surface cells become
large and flattened, with small or absent nuclei.
• Vaginal cytology is a type of endocrine assay. Tracking changes in
the morphology of desquamated vaginal epithelial cells provides a
convenient means of changes in estrogen levels.
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Vaginal cytology
• functional (hormonal) – cell appearance is classified (menstrual
cycle or pathophysiological gravidity can be monitored)
• onkological – cells received from endocervix and stained according
to Papanicolau (pap smears signed as PAP I – V, now known as
Bethesda system) are studied.
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Superfitial cells
Intermediate cells
Parabasal cells
Basal cells
Vaginální epitel – cytologie
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Classification of vaginal epithelial cells(cell size, staining of cytoplasm, nucleo-cytoplasmic ratio)
Superfitial cells – during proliferative phase
(estrogen influence)
Intermediate cells – during secretory phase
(progesterone influence)
+ leukocytes in smear
Parabasal cells – during childhood or senium
(epithelial atrophy)
Basal cells – normally not present in smears
(indicate a deep damage of the epithelium)
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Labium minus
sebaceous glands
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Labium minus
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Human placenta
• discoidalis
• olliformis
• hemochorialis
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Human placenta
• pars fetalis – chorionic plate, chorionic villi
(anchoring, free)
• pars materna – decidua basalis
• intervillous space
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Placental barrier:
• Midgestation: endothelium of capillaries + basal membrane, CT, cytotrofoblast, basal membrane of syncytiotrofoblast, syncytiotrofoblast
• 5th month to birth: endothelium of capillaries + basal membrane, basal membrane of syncytiotrofoblast, syncytiotrofoblast
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Functions
• transport (O2, CO2, ions, water, nutrition,
hormones, antibodies, metabolites, chemical
substances, drugs, infection agens)
• endocrine (hCG, somatomamotropin, tyrotropin,
kortikotropin; progesteron, estrogens)
• metabolic (glycogen, cholesterol, fatty acids)
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7.
Female reproductive system – II
Slides:
47. Uterus – proliferative phase (HE)
48. Uterus – secretory phase (HE)
49. Vagina (Best’s carmine) – glycogen
50. Vagina (HE)
51. Labium minus (HE)
99. Funiculus umbilicalis (HE or Azan)
100. Placenta (HE)