fetal period

8/2/2019 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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fetal period

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