fetal period
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Third Month to Birth:
The fetal period
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The Fetal Period:
From 9 weeks to birth
Growth in size and maturity towards thefunctional state
Overt sexual differentiation has only justbegun
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Fetal Period 9 12 weeks
Elongation of the body Growth of the head slows down
Face broad
Ears low-set
Primary ossification centers appear in the skeleton
Upper limbs reach their final relative lengths
Maturation of external genitalia (W 12)
Intestinal coils return to abdomen
Hemopoiesis in the spleen not the liver
Urine is excreted into amniotic fluid
Fetus begins to move
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Fetal Period
13 16 weeks
Growth is very rapid
Eye movement occur (W 14)
Skeleton shows clearly on radiographs (x-ray)
Ears close to their definitive position on thesides of the head
Eye face anteriorly (non-human)
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Fetal Period
17 20 weeks Growth slows down
Fetal movements are commonly recognized
(quickening) The skin is covered in greasy cheese-like material
known as : vernix caseosa
The body is usually completely covered with fine
downy hair called Lanugo (W 20)
Eyebrows and head hair are also visible
Brown fat form at sites of heat production (root of
neck post. To sternum, perineal area, )
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Fetal Period
21 25 weeks
Substantial weight gain
Body better proportioned
Fingernails are present
Skin wrinkled and pink and translucent
Surfactant is produced, however, if a fetus is
born prematurely will die (W 25) because ofrespiratory system immaturity
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Fetal Period
26 29 weeks
A fetus often survives: lungs are capable fobreathing air
Eyes reopen (W 26)
Subcutaneous fat
White fat increases (3.5% of body wt.)
Bone marrow takes over hemopoiesis (W 28)
Descent of testes starts (W 28)
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Fetal Period
30 34 weeks
Papillary light reflex is present (W 30)
White fat 8% of body wt.
Survive if born prematurely
Upside down position of fetus (head heavierthan the feet)
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Fetal Period
35 38 weeks
Orientation to light
Slowing of growth
CRL = 36 cm
WT = 3400 grs.
White fat = 16% of body wt.
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4d ultrasound in embryology
Fri Sep 12, 4:24 PM ETThis image captured using a4D scanner suggests thatunborn babies exhibit facialexpressions as a reflex in
preparation for birth,obstetrician Professor StuartCampbell said in London,Friday, Sept. 12, 2003. CreateHealthcare who released thisimage Friday, claim that recent
advances in ultrasoundscanning have shown thatbabies smile, cry and blinkinside the womb. (APPhoto/Create Healthcare/PA)
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Fetal Period
Full Term:
Skin is bluish-pink
Chest prominent
Breasts protrude (both sexes)
Testis usually in the scrotum
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