hormonal regulation of gametogenesis · 2018-01-11 · female reproductive system hormonal...
TRANSCRIPT
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HORMONAL REGULATION
OF GAMETOGENESIS
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FEMALE REPRODUCTIVE
SYSTEM
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OVARIES
OVIDUCT (UTERINE TUBES)
UTERUS
VAGINA
FEMALE REPRODUCTIVE SYSTEM
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FEMALE REPRODUCTIVE SYSTEM
OVIDUCT (UTERINE TUBES)
UTERUS
INFUNDIBULUM, AMPULLA, ISTHMUS, UTERINE
FUNDUS, BODY (CORPUS), CERVIX
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FEMALE REPRODUCTIVE SYSTEM
OVARY
- thin connective tissue capsule
underlying germinal epithelium
TUNICA ALBUGINEA
GERMINAL EPITHELIUM
CORTEX
- surrounds the medulla and
contains maturing follicles
MEDULLA
- central connective tissue
containing vascular supply and
nervous innervation
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FEMALE REPRODUCTIVE SYSTEM
OVARY
3 to 5 million OOGONIA differentiate into
PRIMARY OOCYTES during early development
OOCYTES becomes surrounded by squamous
(follicular) cells to become PRIMORDIAL FOLLICLES
most PRIMORDIAL FOLLICLES undergo
atresia leaving 400,000 at birth
oocytes at birth arrested at
Meiosis I (prophase)
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FEMALE REPRODUCTIVE SYSTEM
OVARY
THREE STAGES OF OVARIAN FOLLICLES CAN
BE IDENTIFIED FOLLOWING PUBERTY:
(each follicle contains one oocyte)
(1) PRIMORDIAL FOLLICLES
- very prevalent; located in the
periphery of the cortex
- a single layer of squamous follicular
cells surround the oocyte
(2) GROWING FOLLICLES
- three recognizable stages:
(a) early primary follicle
(b) late primary follicle
(c) secondary (antral) follicle
(3) MATURE (GRAAFIAN) FOLLICLES
- follicle reaches maximum size
OO
GE
NE
SIS
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FEMALE REPRODUCTIVE SYSTEM
OVARIAN FOLLICLES
(1) PRIMORDIAL FOLLICLES
(2) GROWING FOLLICLES
(a) early primary follicle
- follicular cells still unilaminar but now are cuboidal in appearance
- oocyte begins to enlarge
(b) late primary follicle
- multilaminar follicular layer; cells now termed granulosa cells
- zona pellucida appears; gel-like substance rich in GAGs
- surrounding stromal cells differentiate into
theca interna and theca externa
(b) secondary (antral) follicle
- cavities appear between granulosa cells forming an antrum
- follicle continues to grow
- formation of cumulus oophorus and corona radiata
(3) MATURE (GRAAFIAN) FOLLICLES
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FEMALE REPRODUCTIVE SYSTEM
OVARIAN FOLLICLES
late primary follicle
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FEMALE REPRODUCTIVE SYSTEM
OVARIAN FOLLICLES
GRANULOSA (FOLLICULAR) CELLS
ZONA PELLUCIDA
OOCYTE
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FEMALE REPRODUCTIVE SYSTEM
OVARY
MATURE (GRAAFIAN) FOLLICLE
cumulus oophorus
corona radiata
theca interna and externa
zona pellucida
theca interna cells begin to
produce androgens that are
converted to estrogens
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FEMALE REPRODUCTIVE SYSTEM
HORMONAL REGULATION OF
OOGENSIS AND OVULATION
HYPOTHALAMUS release of GnRF which
stimulates release of LH and FSH from the
adenohypophysis (ANTERIOR PITUITARY)
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FEMALE REPRODUCTIVE SYSTEM
HORMONAL REGULATION OF OOGENSIS AND OVULATION
FOLLICULAR PHASE LUTEAL PHASEOVULATION
10-20 primordial follicles begin to develop
in response to FSH and LH levels
FSH and LH stimulate theca and granulosa
production of estrogen and progesterone
surge of LH induces ovulation
theca and granulosa cells transform into the corpus
luteum and secrete large amounts of progesterone
if fertilization does not occur, corpus luteum
degenerates ... if fertilization does occur, HCG
released from the embryo maintains corpus luteum
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FEMALE REPRODUCTIVE SYSTEM
HORMONAL REGULATION OF OOGENSIS AND OVULATION
OVULATION:
sharp surge in LH
with simulataneous
increase in FSH
Meiosis I resumes;
oocyte and surrounding
cumulus break away and
are extruded
oocyte passes into
oviduct
ECTOPIC
IMPLANTATIONS
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FEMALE REPRODUCTIVE SYSTEM
CORPUS LUTEUM
FORMED FROM FOLLICLE WALL WHICH
REMAINS FOLLOWING OVULATION
(1) GRANULOSA LUTEIN CELLS
- large, light cells derived from
granulosa cells
TRANSFORMED CELLS SECRETE
ESTROGENS AND PROGESTERONE:
(2) THECA LUTEIN CELLS
- strands of small cells derived from
theca interna
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MALE REPRODUCTIVE
SYSTEM
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MALE REPRODUCTIVE SYSTEM
TESTES
EPIDIDYMIS
VAS DEFERENS
SEMINAL VESICLES
PROSTATE
BULBOURETHRAL GLANDS
URETHRA
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MALE REPRODUCTIVE SYSTEM
TESTIS
- thick connective tissue capsule
- connective tissue septa divide
testis into 250 lobules
TUNICA ALBUGINEA
(1) SEMINIFEROUS TUBULES
- each lobule contains 1-4
seminiferous tubules and
interstitial connective tissue
- produce sperm
INTERSTITIAL TISSUE
- contains Leydig cells which
produce testosterone
(2) RECTUS TUBULES
(3) RETE TESTIS
(4) EFFERENT DUCTULES
(5) EPIDIDYMIS
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TESTIS
MALE REPRODUCTIVE SYSTEM
EPIDIDYMIS
TUNICA
ALBUGINEA
LOBULES
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TESTIS H&E
SEMINIFEROUS TUBULES
SEMINIFEROUS
TUBULES
INTERSTITIAL
CONN. TISSUE
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TESTIS
MALE REPRODUCTIVE SYSTEM
SEMINIFEROUS TUBULES
SEMINIFEROUS EPITHELIUM
- complex stratified epithelium
containing two basic cell populations:
(1) SPERMATOGENIC CELLS
(2) SERTOLI CELLS
stem cells which regularly replicate
and differentiate into mature sperm
as they migrate toward the lumen
nonreplicating physical support cells
INTERSTITIAL CONNECTIVE TISSUE
(1) LEYDIG CELLS
produce and release testosterone
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MALE REPRODUCTIVE SYSTEM
SERTOLI
CELLSSPERMATOGONIA
1º SPERMATOCYTE
2º SPERMATOCYTE
SPERMATIDS
SPERMATOGENESISSPERMATOGONIA 1º SPERMATOCYTE 2º SPERMATOCYTE SPERMATIDS
SERTOLI CELLS:
- columnar with adjoining lateral processes
- Sertoli-Sertoli junctions divide
seminiferous tubules into basal and
adluminal compartments
- extend from basal lamina to lumen
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MALE REPRODUCTIVE SYSTEM
SEMINIFEROUS TUBULES
SPERMATOGENESIS
THREE PHASES:
(1) Spermatogonial Phase (Mitosis)
- spermatogonia proliferate by mitotic
divisions to provide stem cells and
cells which will proceed through
spermatogenesis (1º spermatocytes)
(2) Spermatocyte Phase (Meiosis)
- diploid cells (2n) created in spermatogonial
phase give rise to haploid cells (1n)
- Meiosis I (reduction division) &
Meiosis II (equatorial division)
- 1º spermatocytes enter Meiosis I to form
2º spermatocytes which then enter
Meiosis II and result in spermatids
(3) Spermatid Phase (Spermiogenesis)
- spermatid differentiation into spermatazoa
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MALE REPRODUCTIVE SYSTEM
SPERMATOGENESIS
THREE PHASES:
(1) Spermatogonial Phase (Mitosis)
(2) Spermatocyte Phase (Meiosis)
(3) Spermatid Phase (Spermiogenesis)
- acrosome formation; golgi granules fuse to
form acrosome that contains hydrolytic
enzymes which will enable the
spermatozoa to move through the
investing layers of the oocyte
- flagellum formation; centrioles and
associate axoneme (arrangement of
microtubules in cilia)
- changes in size and shape of nucleus;
chromatin condenses and shedding of
residual body (cytoplasm)
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MALE REPRODUCTIVE SYSTEM
HORMONAL REGULATION OF
MALE REPRODUCTIVE FUNCTION
HYPOTHALAMUS REGULATES ACTIVITY OF
ANTERIOR PITUITARY (ADENOHYPOPHYSIS)
ADENOHYPOPHYSIS SYNTHESIZES HORMONES
(LH and FSH) THAT MODULATE ACTIVITY OF
SERTOLI AND LEYDIG CELLS
Luteinizing Hormone (LH): stimulates testosterone
production by Leydig cells
Follicle Stimulating Hormone (FSH): stimulates production of sperm
in conjunction with testosterone by regulating activity of Sertoli cells
SERTOLI CELLS STIMULATED BY FSH AND TESTOSTERONE RELEASE
ANDROGEN BINDING PROTEIN WHICH BINDS TESTOSTERONE;
THEREBY INCREASING TESTOSTERONE CONCENTRATION WITHIN THE
SEMINIFEROUS TUBULES AND STIMULATING SPERMATOGENESIS
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Thank you