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Fetal Development

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					      Fetal Development

         Dr/ Sahar Elkheshen
Lecturer of Maternity & Gynecological Nursing
                 MUST
    Embryonic and Fetal Structures
•   Decidua
•   Fetal membranes
•   Amniotic sac
•   Umbilical cord
•   Placenta
              I - Decidua
• Refers to endometrial lining during
  pregnancy.
• It devided into three separate layers:
  Baisalis (directly under the embryo)
  Capsularis (enlarges as the embryo grows)
  Vera remaining lining of the endometrium.
     II - Fetal membranes
The chorion is the fetal membrane closest to
the uterine wall.

The amnion is the thin, tough inner fetal
membrane that lines the amniotic sac.
           III – Amniotic sac
• Is enclosed within the
  chorion.
• Expands into the
  chorionic cavity as it
  enlarges.
• Fuses with the chorion
  by the 8th week of
  gestation.
• Contains fluid known
  as amniotic fluids.
 Functions of amniotic fluid
Helps to provide a buoyant (floating),
temperature controlled environment.
Serves as fluid wedge and lubricant that
helps to open the cervix during birth.
Later in through pregnancy fetal kidney
function and baby urinates into the amniotic
fluids and serves as the main source of
fluid.
             Umbilical Cord
• The flexible cordlike
  structure connecting a
  fetus at the abdomen
  with the placenta
• containing two
  umbilical arteries and
  one vein that transport
  nourishment to the
  fetus and remove its
  wastes.
               IV - Placenta
• The placenta is an
  organ that connects the
  developing fetus to the
  uterine wall to allow
  nutrient uptake, waste
  elimination and gas
  exchange via the
  mother's blood supply.
First Month
      • By the end of the
        first month, the
        embryo is about
        1/10 of an inch
        long. The heart,
        which is no larger
        than a poppy seed,
        has begun beating.
First Month
Two Months
     • The embryo is about
       1 inch long and has
       distinct, slightly
       webbed fingers.
       Veins are clearly
       visible. The heart
       has divided into right
       and left chambers.
Two Months
Three Months
      • By now the fetus is 2
        1/2 to 3 inches long
        and is fully formed. He
        has begun swallowing
        and kicking. All organs
        and muscles have
        formed and are
        beginning to function.
Four Months
      • Your baby is
        covered with a layer
        of thick, downy(soft)
        hair called lanugo.
        His heartbeat can
        be heard clearly.
        This is when you
        may feel your baby's
        first kick.
4 months
Five Months

      • A protective coating
        called vernix caseosa
        begins to form on
        baby's skin. By the end
        of this month, your baby
        will be nearly 8 inches
        long and weigh almost
        a pound.
Six Months
     • Eyebrows and
       eyelids are visible.
       Your baby's lungs
       are filled with
       amniotic fluid, and
       he has started
       breathing motions. If
       you talk or sing, he
       can hear you.
6 Months
Seven Months
      • By the end of the
        seventh month, your
        baby weighs about 3
        1/2 pounds and is
        about 12 inches
        long. His body is
        well-formed.
        Fingernails cover
        his fingertips
Eight Months
      • Your baby is gaining
        about half a pound
        per week, and
        layers of fat are
        piling on. He has
        probably turned
        head-down in
        preparation for birth.
        He weighs between
        4 and 6 pounds.
Nine Months
      • Your baby is a hefty
        6 to 9 pounds and
        measures between
        19 and 22 inches.
        As he becomes
        more crowded, you
        may feel him move
        around less.

				
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posted:3/29/2013
language:Latin
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