ANATOMY AND PHYSIOLOGY OF FEMALE REPRODUCTVE INCLUDING THE PLACENTAL CIRCULATION
Transcript of ANATOMY AND PHYSIOLOGY OF FEMALE REPRODUCTVE INCLUDING THE PLACENTAL CIRCULATION
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Produce estrogen and progesterone
- Estrogen: promotes breast development & pubic hair distribution preventsosteoporosis and keeps cholesterol levels reduced & so limits effects of
atherosclerosis Fallopian tubes.
2. Fallopian tubes
Approximately 10 cm in length
Arises from each corner of the uterine body
Conveys ova from ovaries to the uterus
Site of fertilization
Parts: interstitial
isthmus cut/sealed in BTL
ampulla site of fertilization
infundibulum most distal segment; covered with fimbria
3. Uterus
Hollow muscular pear shaped organ
- uterine wall layers: endometrium(inner); myometrium(middle);
perimetrium(outer)
Organ of menstruation
Receives the ova
Provide place for implantation & nourishment during fetal growth
Protects growing fetus
Expels fetus at maturity
Has 3 divisions: corpus fundus , isthmus (most commonly cut during CSdelivery) and cervix.
4. Uterine Wall
Endometrial layer: formed by 2 layers of cells which are as follows:
basal layer- closest to the uterine wall.
glandular layer inner layer influenced by estrogen and progesterone;
thickens and shed off as menstrual flow.
Myometrium composed of 3 interwoven layers of smooth muscle; fibers are
arranged in longitudinal; transverse and oblique directions giving it extreme
strength.
5. Vagina
Acts as organ of copulation
Conveys sperm to the cervix
Expands to serve as birth canal
Wall contains many folds or rugae making it very elastic
Fornices uterine end of the vagina; serve as a place for pooling of semen following
coitus.
Bulbocavernosus circular muscle act as a voluntary sphincter at the external
opening to the vagina (target of Kegels exercise).
Menstrual Cycle
1. Female reproductive cycle wherein periodic uterine bleeding occurs in response
to cyclic hormonal changes.
2. Allows for conception and implantation of a new life.3. Its purpose it to bring an ovum to maturity; renew a uterine bed that will be
responsive to the growth of a fertilized ovum.
Menstrual Phases
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It serve s as the fetal lungs, kidneys and gastrointestinal tract and as a separate
endocrine organ throughout pregnancy.
CIRCULATION
The fetus is connected by the umbilical cord to the placenta, the organ that develops andimplants in the mother's uterus during pregnancy.
As early as the 12th day of pregnancy, maternal blood circulation begins to collect
in the intervillus spaces of the uterine endometrium surrounding the chronic villi.
By the 3rd week of pregnancy, through the blood vessels in the umbilical cord, the fetusreceives all the necessary nutrition, oxygen, and life support from the mother through the
placenta..
From there, the nutrients are being transported back to the growing embryo.
Waste products and carbon dioxide from the fetus are sent back through the umbilical
cord and placenta to the mother's circulation to be eliminated.
The blood from the mother enters the fetus through the vein in the umbilical cord. It goes
to the liver and splits into three branches. The blood then reaches the inferior vena cava, amajor vein connected to the heart.
Inside the fetal heart
- Blood enters the right atrium, the chamber on the upper right side of the
heart. Most of the blood flows to the left side through a special fetal
opening between the left and right atria, called the foramen ovale.- Blood then passes into the left ventricle (lower chamber of the heart) and
then to the aorta, (the large artery coming from the heart).- From the aorta, blood is sent to the head and upper extremities. After
circulating there, the blood returns to the right atrium of the heart throughthe superior vena cava.
- About one-third of the blood entering the right atrium does not flow
through the foramen ovale, but, instead, stays in the right side of the heart,
eventually flowing into the pulmonary artery.
Because the placenta does the work of exchanging oxygen (O2) and carbon
dioxide (CO2) through the mother's circulation, the fetal lungs are not used for
breathing. Instead of blood flowing to the lungs to pick up oxygen and then
flowing to the rest of the body, the fetal circulation shunts (bypasses) most of the
blood away from the lungs. In the fetus, blood is shunted from the pulmonary
artery to the aorta through a connecting blood vessel called the ductus arteriosus.