10 Fetal Development Monthly

8/12/2019 10 Fetal Development Monthly

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FETAL PERIOD

MONTHLY CHANGES



OBJECTIVE

•

FETAL PERIOD. (Correlation with age) by followingparameters.

• GROWTH: LENGTH AND WEIGHT.

• DEVELOPMENT: TASTE Buds, SWALLOWING

RESPIRATION, SUCKING,HEARING VISION &

MOVEMENTS.

• PLACENTAL CHANGES.



FETAL PERIOD.

• The period from the beginning of theninth week to birth is known as the fetalperiod.

• It is characterized by maturation of

tissues and organs and rapid growth ofthe body.



LENGTH MEASUREMENT

• CROWN-RUMP LENGTH (CRL) The length of the fetus is usually indicated as the

(sitting height).

• CROWN-HEEL LENGTH (CHL)

The measurement from the vertex of the skull tothe heel (standing height).





Age (Weeks)

Taste buds appear 7

Swallowing 10

Respiratory movements 14-16

Sucking movements 24

Some sounds can be heard 24-26

Eyes sensitive to light 28

Recognition of form and color occurs postnatally.

DEVELOPMENTAL CHANGES.



HEAD AND BODY DEVELOPMENT RATIO.

• One of the most striking changes

taking place during fetal life is the

relative slowdown in growth of thehead compared with the rest of the

body.



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3RD MONTH:

head size is half of the CRL.

5TH

MONTH: head size is one third of the CHL.

AT BIRTH:

head is one fourth of the CHL .



3rd MONTH.

• The face becomes more human looking

eyes moves on ventral aspect from lateral side.

• Primary ossification centre .

• External Genitalia develops.

• Intestinal loops back in abdomen from

umbilical cord.





FOURTH AND FIFTH MONTHS

• The fetus lengthens rapidly

its CRL is approximately 15 cm to19 cm.

• Weight of the fetus increases little

still less than 500 g.

• The fetus is covered with fine hair, called lanugo

hair.

• Movement of the fetus can be felt by mother.

Kicking.



LANUGO HAIRS.



SIXTH MONTH.

•

Skin reddish and wrinkled. due to lack of underlying connective tissue.

•A fetus born early in sixth month difficult tosurvive. due nervous and respiratory system

non coordination and differentiation.

• Other systems are able to function well .



SEVENTH MONTH

• If fetus born in this age has 90% survival

rate.

• Eye are sensitive to light.



EIGHTH & NINTH MONTH

• Well rounded contours: Due development of

sub cutaneous fat.

• Vernix Caseosa: Skin covered by whitish fatty

substance composed of secretion ofsebaceous gland.

•

Weight: gained most of the pregnancy

• Sexual characteristics well marked .Testesdescent in scrotum.



EIGHTH & NINTH MONTH

• Head circumference is larger than the body.

•

Biparital diameter is used for themeasurement of the fetal head during

pregnancy

• which is very important for the management

of delivery , if mother has small pelvis





PELVIS AND FETAL HEAD.

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10 Fetal Development Monthly