Embro development : Physiology of pregnancy, 1st, 2nd , 3rd trimesters,

1. WELCOME TO
OUR PRESENTATION

2. PRESENTED TO • PRESENTED BY
Name ID
1. Faruk Hossen Fn-14006
2. Md Faridul Islam Fn-14008
3. Sonyia Akter Fn-14033
4. Md Nazmul Huda Nasim Fn-14037
5. Md Mahtab Islam Fn-14042
6. Sanzida Anjom tamanna Fn-14056
Farhana Akter
Assistant Professor
Dept of. FTNS
MBSTU

3. EMBRYO DEVELOPMENT
Embryo-
the stage in human development from the
first division of the zygote until about nine weeks
after fertilization.
Stages
• Fertilization
• Cleavage
• Gastrulation
• CELLULAR DIFFERENTIATION

4. HUMAN DEVELOPMENT FROM
CONCEPTION TO BIRTH IS DIVIDED INTO
THREE TRIMESTERS
• First trimesters,
• Second trimesters,
• Third trimesters.

5. FIRST TRIMESTERS
• It’s period weeks 1-12.
• Fertilization
• Placenta & all organs begin to formed
1. Heart
2. Brain
3. Lungs
4. Eye
5. Ears
6. bone

6. FERTILIZATION
• Sperm penetrates an egg and creates a single set of 46
chromosomes called a zygote.
• The fertilized egg traveling through the fallopian tube toward
the uterus, dividing into cells ; it is called a morula. The morula
becomes a blastocyst.

7. CLEAVAGE
The term used to describe the early cell division associated with
embryonic development.
• During this time period, the number of cells increase tremendously.
• The fertilized egg traveling through the fallopian tube toward the uterus,
dividing into cells ; it is called a morula. The morula becomes a blastocyst.

8. GASTRULATION
• Three layers
• Each layer will eventually
• form the different organ systems

9. CELLULAR DIFFERENTIATION
Due to gene expression, cells undergo
cellular differentiation, in which the
cells become increasingly specialized
in structure & function.

10. FETAL DEVELOPMENT : WEEK 1,2&3
• Heart is now beating at a steady rhythm.
• Placenta has begun to form
• Movement of rudimentary blood through the
main vessels.
• Eyes and ears are forming.
• Embryo is ¼ inch long.

11. FETAL DEVELOPMENT – WEEK 4
• Formation of the lungs, jaw,
nose, and palate begin now.
• Hand and feet buds have
webbed structures that will
become the fingers and toes.
• The brain is continuing to form.
• Detect audible heartbeat.
• Embryo is about ½ inch in length.

12. FETAL DEVELOPMENT – WEEK 5
• Every essential organ has begun to form.
• Hair and nipple follicles are forming.
• Eyelids and tongue have begun formation.
• Elbows and toes are more visible
• Trunk begins to
straighten out.

13. FETAL DEVELOPMENT – WEEK 6
• Ears are continuing to form externally and internally.
• bones are beginning to form
• muscles can contract.
• Embryo is about 1 inch long.

14. FETAL DEVELOPMENT – WEEKS 7 TO 12
• At 10 weeks, the embryo is at the end of the embryonic
period and begins the fetal period.
• Fetus has grown to about 3 inches in length and weighs
about an ounce.
• Genitalia clearly formed
into male or female
• Buds for baby teeth appear.

15. SECOND TRIMESTERS
 Time 14 to 24 week
 Skin cover fetus body
 Develop sweat gland, liver, pancreas,
nervous system, heartbeat.
 Hair begin to formed
 Develop sleeping & waking cycle

16. FETAL AGE – WEEKS 12 TO 14
• Fetus’s skin is transparent.
• Fine hair begins to form on the
head.
• Fingerprints developed on
fingers of the fetus.
• Sweat glands have developed,
and the liver and pancreas
produce fluid secretions.
• The fetus has reached 6
inches in length and
weighs about 4 ounces.

17. FETAL AGE – WEEKS 15 TO 18
• Movements are being felt
more often by the mother.
• Eyebrows and eyelashes grow &tiny
nails have begun to grow on the
fingers and toes.
• A fetal heartbeat can be heard by a
stethoscope.
• Fetus has reached a length
of 8 inches and weighs
about 12 ounces.

18. FETAL AGE – WEEKS 19 TO 21
• Skin covers the fetus’s entire body.
• Transparent while fat begins to
develop.
• All the components of the eyes are
developed.
• Liver and pancreas are working
hard to develop completely.
• Fetus has reached about 10-11
inches in length and weighs
about 1 – 1 ¼ pounds

19. FETAL AGE – WEEKS 22 TO 24- BEGINNING THE
THIRD TRIMESTER
• Fetus has developed sleeping and
waking cycles.
• The fetus has a startle reflex, and the
air sacs in the lungs have begun
formation.
• The nervous system has
developed enough to
control some functions.
• Fetus has reached about
14 inches in length and
weighs about 2 ¼ pounds.

20. THIRD TRIMESTER
• Time 27 to 40 week
• Gain weight rapidly
• Bones fully developed
• Eyelids open
• Notice fetal movement
• Lanugo hair disappear from skin
• Descend head down position for
preparing birth

21. FETAL AGE – WEEKS 25 TO 30
• store fat on the body, reach about 15-17 inches long and
weigh about 4-4 ½ lbs.
• rhythmic breathing movements in lungs occur.
• Bones are fully developed, but are still soft and pliable.
• The fetus is storing its own calcium, iron and phosphorus.
• The eyelids open after being closed, since the end of
the first trimester.

22. FETAL AGE – WEEKS 31 TO 34
• Fetus will descend into the head down position preparing
for birth.
• Gain weight more rapidly.
• Lanugo hair disappear from the skin, and become less
red and wrinkled.
• Fetus is 16-19 inches and weigh from 5 ¾ lbs to 6 ¾ lbs.

23. FETAL AGE – WEEKS 35 TO 38
• Fetus becomes bigger, notice a change in fetal
movement.
• The fingernails have grown
• Small breast buds are present on both sexes.
• All organs are developed.
• Fetus is about 19 – 21 inches in length and weighs
anywhere from 6 ¾ lbs to 10 lbs.

24. FETAL CIRCULATION
• Umbilical Cord
• Fetal Heart Rate-
110-160 BPM
• Ductus venosus
• Ductus arteriosus
• Foramen ovale
•

25. FIRST TRIMESTERS

26. SECOND TRIMESTERS

27. THIRD TRIMESTER

28. THE END OF THIS PRESENTATION BUT
THE BEGINNING OF A NEW LIFE….