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Transcript of Copyright © John Wiley & Sons, Inc. All rights reserved. Chapter 28 The Reproductive Systems.
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Copyright © John Wiley & Sons, Inc. All rights reserved.
Chapter 28
The Reproductive Systems
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Copyright © John Wiley & Sons, Inc. All rights reserved.
Reproductive System
Primary sex organs (gonads) – testes in males,
ovaries in females
o Gonads produce gametes (sperms & ova)
and secrete sex hormones
Accessory reproductive organs – ducts, glands
and external genitalia
Sex hormones– testosterone (males),
estrogens and progesterone (females)
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Gamete formation is by meiosis, in which the number of chromosomes is halved (from 2n to n)
Meiosis consists of two nuclear divisions meiosis1 & meiosis 2
The products of meiosis are 4 daughter cells instead of two with half the number of chromosomes
Meiosis accomplishes two tasks: It reduces the chromosome number by half (2n to n)It
introduces genetic variability
Gamete formation and Meiosis
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Gamete formation and Meiosis
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The male gonads are the testes (singular:
testis)o The ducts of the male reproductive system
are the: Epididymis Vas deferens (ductus deferens) ejaculatory duct urethra
o Accessory reproductive glands are the: Seminal vesicles Prostate Bulbourethral glands
Male Reproductive Anatomy
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The scrotum is a supporting
structure for the testes
o It consists of a sac of loose
skin and superficial fascia
o The dartos and
cremaster muscles
regulate
the testicular temperature
required for sperm
production
(2-3o below the core temp)
Male Reproductive Anatomy
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The spermatic cord is a
supportive connective tissue
structure that ascends “out
of” the scrotum, and
contains:
The Vas deferens
The testicular artery
Veins, lymphatics, and
autonomic nerves
The spermatic cord pass
through the inguinal canal
Male Reproductive Anatomy
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Covered by the tunica vaginalis ( peritoneal
layer)
The tunica albuginea forms septae that divide
each testis into lobules
o Each lobule contains 1-3
seminiferous tubules
where sperm are
produced
Male Reproductive Anatomy
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Seminiferous Tubules Seminiferous
tubules are lined by:
G
erm cells in various stages of maturation which give rise to sperms &
S
ertoli cells- nourish the germ cells, form fluid for sperm transport
I
n between the Seminiferous tubules are interstitial cells of Leydig
that secrete
testosterone
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Develop near kidney on posterior abdominal
wall
Descends into scrotum by passing through
inguinal canal
during 7th month of fetal development
Failure of the testes to descend is called
cryptorchidism
Untreated bilateral cryptorchidism results in
sterility & a greater risk of testicular cancer
Descent of Testis
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Spermatogenesis is the process by which the
seminiferous tubules of the testes produce sperms.
Spermatogenesis begins at puberty
It begins with the diploid spermatogonia (stem cells).
Spermatogonia undergo mitosis to form primary
spermatocytes (also diploid)
Primary spermatocyte undergo meiosis I, to form
haploid secondary spermatocytes ( 23
chromosomes)
Secondary spermatocytes undergo meiosis II to form
four spermatids ( haploid)
Spermatogenesis
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Spermiogenesis: spermatids to sperms
Spermiogenesis – spermatids elongate, lose
excess cytoplasm and form a tail, becoming sperms
Sperms (spermatozoa) have three major regions
o Head – contains the nucleus has the acrosome cap
over nucleus- contains digestive enzymes to help penetrate
oocyte
o Midpiece – contains mitochondria spiraled around
upper tail
o Tail – a flagellum
o Each day about 300 million sperms formed
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Spermatogenesis
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The acrosome is a cap-like vesicle filled with
enzymes (hyaluronidase and proteases)
that help a sperm to penetrate
a secondary oocyte to bring about
fertilization
The middle piece contains many
mitochondria which provide
the energy (ATP) for locomotion
Spermatozoa
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spermatogonia
primary spermatocytes
secondary spermatocytes
spermatids
spermatozoa
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At puberty- hypothalamus stimulates anterior pituitary by
GnRH (gonadotropin releasing hormone)
Anterior pituitary produces follicle-stimulating hormone
(FSH) and luteinizing hormone (LH).
LH stimulates Leydig cells to secrete testosterone ( high
testosterone suppresses LH)
FSH stimulates Sertoli cells to secrete androgen-binding
protein (ABP) that keeps testosterone levels high;
testosterone stimulates spermatogenesis
Sertoli cells release Inhibin to inhibit FSH; control
spermatogenesis
Hormonal Control of Spermatogenesis
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Control of Testosterone Production
Negative feedback system
controls blood levels of
testosterone
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Prenatal effects; male reproductive system
development, assists testicular descent
controls the growth, development, functioning, and
maintenance of sex organs
stimulates development of male secondary sex
characteristics
stimulates bone growth, protein anabolism, and
sperm maturation
sexual behavior & libido
Actions of Testosterone
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Before ejaculation, sperm travel via the
following route:
o Seminiferous tubules
o Rete testis (network)
o Efferent ducts
o Epididymis
o Vas (ductus)
deferens…
Pathway of Sperm Flow through the Ducts of the Testis
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Sperm travelogue continued:
o Vas (ductus) deferens …
o Ejaculatory duct (within
the prostate gland)
o Urethra, which has 3
portions to it:
prostatic
membranous
penile
Duct system
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The epididymis lies along the posterior border
of the testis
The epididymis is lined by columnar epithelium
having stereocilia and is the site of sperm
maturation ( sperms become motile)
sperm may remain in storage here for at least
a month, after which they are degenerated and
reabsorbed.
Duct system: Epididymis
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The ductus (vas) deferens stores sperm and
propels them toward the urethra during ejaculation
Lined with pseudostratified columnar ciliated
epithelium
The ejaculatory ducts are formed by the union of
the ducts from the seminal vesicles and ductus
deferens; their function is to eject spermatozoa into
the prostatic urethra
The male urethra serves as a passageway for semen
and urine. The male urethra is subdivided into three
portions: prostatic, membranous, and spongy
Duct system
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o Seminal vesicles secrete a viscous,
alkaline fluid (mainly during ejaculation)
which makes up 60% of the semen volume.
o It contains fructose (for energy),
prostaglandins
the alkalinity neutralizes the acidity of the
male urethra and the female reproductive
tract
Accessory Glands
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The prostate a donut-shaped gland that
secretes about 25% of volume of semen
Prostatic fluid is a milky, slightly acidic solution
containing citric acid (for energy), acid
phosphatase, and proteolytic enzymes (PSA and
hyaluronidase)
The bulbourethral (Cowper’s) gland is a pea-
sized gland inferior to the prostate. It secretes a
protective & lubricating alkaline mucus that
decreases acidic environment of the urethra
Accessory Glands
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Accessory Glands
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Clinical application
Benign prostatic hypertrophy is an enlargement of the prostate gland in the absence of cancer. It is a very common affliction as men age, resulting in obstruction of urine flow and inability to completely empty the bladder
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Semen is a mixture of sperm and seminal
fluid, a liquid that consists of the secretions of
the seminiferous tubules, seminal vesicles,
prostate, and bulbourethral glands
o The volume of semen in a typical ejaculation
is 2.5–5 milliliters (mL), with 50–150 million
sperm per mL
when the number falls below 20 million/mL,
the male is likely to be infertile
Semen
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The penis contains the urethra and is a
passageway for the ejaculation of semen and
the excretion of urine
o It consists of a body, glans penis, and a root
The body of the penis is composed
of three cylindrical masses of
tissue, each surrounded by
fibrous tissue called the
tunica albuginea
The Penis
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The two dorsolateral masses are the corpora
cavernosa penis, and the smaller midventral
mass is the corpus spongiosum
The Penis
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Upon sexual stimulation (visual, tactile,
auditory, olfactory, or imagined), sacral
parasympathetic fibers initiate and maintain
an erection
o Under the influence of nitric oxide released
from parasympathetic neurons
(“neurogenic NO”), arteries that supply the
penis dilate and blood enters penile sinuses
in the erectile tissue; erection
The Male Sexual Response
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After an erection, sympathetic stimulation
is necessary for ejaculation
o The smooth muscle sphincter at the base of
the urinary bladder must close, followed by
semen being propelled into the penile portion
of the urethra (emission)
o Powerful peristaltic contractions culminate in
the release of semen from
the urethra to
the exterior
The Male Sexual Response
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The organs of the female reproductive
system include the ovaries (female gonads);
the uterine tubes
(fallopian tubes); the uterus; the vagina; and
the external organs (collectively called the
vulva,
or pudendum)
Female Reproductive Anatomy
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o The germinal epithelium covers the surface
of the ovary
o The ovarian cortex contains the follicles in
various stages of maturation
o The ovarian medulla
contains blood vessels,
lymphatic vessels
and nerves
Ovaries
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Oogenesis Is the process of production of oocytes
Before birth:
In the fetal period, oogonia (2n stem cells) multiply by mitosis
Oogonia are transformed into primary oocytes & become
surrounded by a single layer of follicular cells forming
primordial follicles
Primary oocytes begin meiosis 1 but are arrested in prophase 1
At birth upto 2 million primordial follicles are present in the
cortex of the immature ovary
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Oogenesis Childhood ovaries are inactive, and no follicles develop some primordial follicles regress- by the time a female child
reaches puberty, only about 40,000 primordial follicles remain
Puberty to menopause The primary oocytes in the primordial follicles remain
arrested in prophase I until after puberty Beginning at puberty one primary oocyte completes
meiosis1 producing two haploid cells; the first polar body & the secondary oocyte
The secondary oocyte arrests in meiosis II and is ovulated If penetrated by a sperm the secondary oocyte completes
meiosis II, yielding:o One large ovum (the functional gamete)o A tiny second polar body
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Oogenesis
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Primordial follicle Contains a primary oocyte- arrested in the first
meiotic division, surrounded by a single layer flattened follicular cells
Primary follicle consists of a primary oocyte surrounded by one or
more layers of cuboidal granulosa cells primary follicles secretes estrogen which
stimulates changes in the uterine lining.
Ovaries; follicular development
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Secondary follicle contains a primary oocyte, many layers of granulosa cells & a
fluid-filled space- antrum The oocyte is surrounded by the zona pellucida &
corona radiata Graafian ( vesicular)–follicle -most mature stage that bulges
from the surface of the ovary contains a secondary oocyte and a large, fluid-
filled, antrum A secondary oocyte has completed meiosis I and
is arrested in meiosis 2. one vesicular follicle forms each month. Ovulation –rupture of mature follicle with ejection of the
oocyte The ruptured follicle gets transformed into a corpus luteum secretes sex hormones progesterone and estrogen corpus luteum later degenerates to form the corpus albicans
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Ovarian follicles
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After receiving the 2o oocyte at the
infundibulum the uterine tubes provide a
site for fertilization, and then transport for
the ovum if
fertilization occurs
oThe uterine
tubes also have
an ampulla and
an isthmus
Female Reproductive Anatomy
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The main anchors for the ovaries are the
suspensory ligaments of the ovary (for
pelvic wall attachment), and the ovarian
ligament
(provides an
attachment to
the side wall of
the uterus)
Female Reproductive Anatomy
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The broad ligament
is a major support
for the
Uterus
Female Reproductive Anatomy
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The uterus is a pear shaped organ situated
between the urinary bladder and the rectum
o It is also the site of implantation of a
fertilized ovum, development of the fetus
during pregnancy, and
labor
o During reproductive cycles when
implantation does not occur, the uterus is
the source of menstrual flow
Female Reproductive Anatomy
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Anatomical subdivisions of the uterus include:
o A dome-shaped superior portion called the
fundus
o A central portion called the body, that tapers
to a narrow isthmus
o the inferior-most
cervix opens into
the vagina through
the cervical
canal
Female Reproductive Anatomy
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The interior of the body of the uterus is called
the uterine cavity
The cervical canal
has an internal os
and an external os
that opens into
the uterine
cavity and the
vagina, respectively
Female Reproductive Anatomy
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Layers of Uterus Outer perimetrium
middle myometrium
inner endometrium, divided into
stratum functionalis (shed during
menstruation)
stratum basalis (gives rise to a new
stratum functionalis after each
menstruation)
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The vagina is a fibromuscular canal lined with
stratified squamous epithelium It has 3 basic functions:
o Serve as a passageway
for menstrual flowo Receive spermo Form the lower
birth canal
Female Reproductive Anatomy
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The vulva (female external genitalia) refers
to the:o Mons pubis (created by adipose tissue)o Erectile tissue of the clitoriso Labia majora ,and labia minorao Vestibule, the
area between the
labia minora contains urethral &
vaginal orifice
Female Reproductive Anatomy
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On either side of the vaginal orifice itself are
the greater vestibular (Bartholin’s) glands
They produce a small quantity of lubricating
mucous during sexual arousal
Female Reproductive Anatomy
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The perineum is a diamond-shaped area that is bounded
anteriorly by the pubic symphysis, laterally by the ischial
tuberosities, and posteriorly by the coccyx
o It contains the external
genitalia and
anus
Female Reproductive Anatomy
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The breasts (mammary glands) are present in the
anterior thoracic wall Contains 15–20 lobes divided into lobules
o Each lobule is
composed of milk-
secreting glands called
alveoli. The nipple has openings
for the lactiferous ducts &
pigmented area (areola)
around it
Female Reproductive Anatomy
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Female Reproductive Anatomy
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Female Reproductive Cycle The female reproductive cycle includes the
ovarian and uterine cycles & the hormonal changes that regulate themo Controlled by monthly hormone cycle of
anterior pituitary, hypothalamus & ovary
Ovarian cycleo changes in ovary during & after
maturation of oocyte and follicles The uterine (menstrual) cycle
o involves changes in the endometriumo preparation of uterus to receive fertilized
ovumo if implantation does not occur, the stratum
functionalis is shed during menstruation
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Hormonal Regulation of Reproductive Cycle GnRH secreted by the hypothalamus:
stimulates the release of FSH and LH by the anterior pituitary gland
o FSH initiates growth of follicles that secrete estrogen estrogen maintains reproductive organs
o LH :o stimulates ovulation o romotes formation of the corpus luteum
which secretes progesterone, estrogens, relaxin, inhibins progesterone prepares uterus for
implantation
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Overview of Hormonal Regulation
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Promotion of the development and maintenance of
female reproductive structures, secondary sex
characteristics
Increase protein anabolism and build strong bones.
Lower blood cholesterol.
Moderate levels of estrogens in the blood inhibit the
release of GnRH by the hypothalamus and secretion of
LH and FSH by the anterior pituitary gland.
Progesterone works with estrogens to prepare the
endometrium for implantation and the mammary
glands for milk synthesis.
Estrogen: functions
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Progesterone is the principal hormone
responsible for maturation of the uterine
endometrium for implantation, as well as an
important player in stimulating breast
development
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In many ways the menstrual cycle closely
parallels the events happening in the ovaries
The female reproductive cycle may be divided
into (4 phases) every 28 days (on average)
Menstrual phase marks the beginning of the
cycle
This is followed by the pre-ovulatory phase
Ovulation occurs on about day 14
after which the post-ovulatory phase begins
Phases of the Female Reproductive Cycle
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The Menstrual phase; days 1-5 The menstrual phase (menstruation) day 1-5
During this phase, small secondary follicles in each
ovary begin to develop.
the stratum functionalis layer of the
endometrium is shed, discharging blood, tissue
fluid, mucus, and epithelial cells as declining levels
of progesterone caused spiral arteries to constrict
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Preovulatory (proliferative)phase - days 6-
13 In the ovary (follicular phase)o secondary follicles secreting estrogeno One dominant secondary follicle develops into a
Vesicular (Graafian) follicleo The graafian follicle enlarges & bulges at
surface of the ovary & is ready for ovulationo increasing estrogen levels trigger the secretion
of LH In the uterus (proliferative phase) increasing estrogen levels have repaired &
thickened the stratum functionalis to 4-10 mm in thickness
With reference to the ovarian cycle, the menstrual and preovulatory phases together are termed the follicular phase because ovarian follicles are developing
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Ovulation is the rupture of the vesicular
ovarian (Graafian) follicle with release of the
secondary oocyte into the pelvic cavity, usually
occurring on day 14 in a 28-day cycle.
o high levels of estrogen during the last part of
the preovulatory phase exert positive
feedback on both GnRH & LH and to cause
ovulation
o Midcycle LH surge causes ovulation
Ovulation; day 14
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High levels ofestrogens fromalmost maturefollicle stimulaterelease of moreGnRH and LH
Hypothalamus
Anterior pituitary
Ovary
Corpus hemorrhagicum(ruptured follicle)
Almost mature(graafian) follicle
LH
GnRH
1 High levels ofestrogens fromalmost maturefollicle stimulaterelease of moreGnRH and LH
Hypothalamus
Anterior pituitary
GnRH promotesrelease of FSHand more LH
Ovary
Corpus hemorrhagicum(ruptured follicle)
Almost mature(graafian) follicle
LH
GnRH
1
2
High levels ofestrogens fromalmost maturefollicle stimulaterelease of moreGnRH and LH
LH surgebrings aboutovulation
Ovulatedsecondaryoocyte
Hypothalamus
Anterior pituitary
GnRH promotesrelease of FSHand more LH
Ovary
Corpus hemorrhagicum(ruptured follicle)
Almost mature(graafian) follicle
LH
GnRH
1
2
3
Ovulation
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Postovulatory (secretory) - days 15-28
Following ovulation, the ruptured vesicular follicle gets
converted into the corpus luteum, under the influence of LH.
The corpus luteum secretes progesterone & estrogens
This phase is the luteal phase
if fertilization does not occur, then the corpus luteum gets
transformed into the corpus albicans; as progesterone &
estrogen levels drop, secretion of GnRH, FSH & LH rises:
follicular growth resumes
if fertilization does occur, the corpus luteum remains for 3
months
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Phases - Postovulatory - days 15-28
In the uterus (secretory phase)
o hormones from corpus luteum promote
thickening of endometrium to 12-18 mm
formation of more endometrial glands &
vascularization
Increased secretion of glycogen
o if no fertilization occurs, corpus luteum
degenerates , loss of hormonal support will
begin menstrual phase
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If pregnancy occurs, the corpus luteum is
“rescued” from degeneration by an LH-like
hormone called human chorionic gonadotrophin
(hCG – produced by the developing embryo)
With hCG support, the corpus luteum goes on
to produce hormones well into the 1st trimester
until the placenta can take over
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Female Reproductive Cycle