AGE DETERMINATION OF FETUS AND EMBRYO

14-Arid-2022 FAISAL SHAHZAD SOMROO

PRESENTED TO: .Dr. Riaz husain Pasha .Dr. Mujeeb-ur-Rehman Sohoo

PRESENTED BY:

Contents Difference between fetus and embryo Stages of development Methods of age determination Different statics Fetal and gestational age

Difference between fetus and embryo

The embryo is defined as the developing pregnancy from the time of fertilization until the end of the eighth week of gestation.

While the fetus a developing mammal or other viviparous vertebrate after the embryonic stage and before birth.

Fetus Embryo

Stages of DevelopmentWeek 1: Zygote Morula Blastocyst

Cont…Week 2: Trophoblast-outer cell layer Embryoblast-inner cell mass Implantation Bilaminar embryo

Cont…Week 3: Gastrulation Notochord formation Trilaminar embryo Mesoderm Somitogenesis Neurogenesis

Cont…Week 4: Heart Placodes Pharygeal arches

Cont… Week 5-7: Early face development WEEK 8 last week of embryonic

development

IMPLANTATION OF EMBRYO

Stage Days

Size (mm)

1 1 0.1 - 0.15

2 2-3 0.1 - 0.2

3 4-5 0.1 - 0.2

4 5-6 0.1 - 0.2

5 7-12 0.1 - 0.2

6 13-15 0.2

7 15 - 17 0.4

Stage Days Size (mm)

8 17-19 1.0 - 1.5

9 19-21 1.5 - 2.5

10 22-23 2 - 3.5

11 23-26 2.5 - 4.5

12 26-30 3 - 5

13 28-32 4 - 6

14 31-35 5 - 7

Stage Days

Size (mm)

14 31 - 35 5 - 7

15 35 - 38 7 - 916 37 - 42 8 - 1117 42 – 44 11 - 1418 44 - 48 13 - 1719 48 – 51 16 - 1820 51 – 53 18 - 22

WHY TO DO IT? For the comparison between normal and

abnormal structure. For diagnosing some inherited disease Cheking there functioning.

EMBRYO STAGES

Methods of determination of age

Ultrasound Method Rectal Examination Method

Ultrasound Method It is a method used for the determination

of fetus and embryo This method is used for the diagnosis of

disease

ULTRASOUND METHOD

Rectal Examination Method

It is a method which is used to determine the age of embryo or fetus with the help of hand.

During rectal examination of animal we focus on the following points in order to determine the exact age of embryo or fetus

Diameter of Amniotic Vesicle Diameter of Placentomes Diameter of Horn containing the fetus Amount of Fetal Fluid Weight of Fetus Diameter of uterine Artery

Cont… Following are the points we will prefer

more Diameter of Amniotic Vesicle Diameter of Placentomes

Diameter of Amniotic Vesicle

A thin, tough, membranous sac that encloses the embryo or fetus of a mammal, bird, or reptile is called Amniotic Vesicle.

It is filled with a serous fluid in which the embryo or fetus is suspended.

In this method we determine the diameter of amniotic vesicle by using our hands.

Diameter of Placentomes

The whole group of fetal and maternal tissues that are involved in placentation is called Placentomes.

In this method we determine the diameter of placentomes by using our hand.

Days of Gestation Diameter of Amniotic Vesicle

30 1.0 cm (Pea Size)

40 2.5-3.0 cm (Size of Plum)

50 3.5-5.0 cm

60 6-7.5 cm

Day of Gestation

Diameter of Placentomes

70 0.5-0.75 cm80 0.5-1.0 cm90 1.0-1.5 cm120 1.5-2.5 cm150 2.5-4.0 cm180 4.0-5.0 cm210 5.0-7.5 cm240 6.0-9.0 cm270 8.0-12 cm

Days of Gestation Diameter of Horn Containing the fetus

30 2-4 cm40 3-6 cm50 5-7 cm60 6-9 cm70 7-10 cm80 9-12 cm90 10-13 cm120 12.5-18 cm150 18-23 cm180210240270

Diameter of Horn containing Fetus

Day of Gestation Amount of Fetal Fluid30 30-60 ml40 75-100 ml50 90-200 ml60 200-450 ml70 350-650 ml80 500-800 ml90 750-1400 ml120 2000-3500 ml150 4000-5000 ml180 4000-7500 ml210 6300-10,000 ml240 8000-12000 ml270 12,000-20,000 ml

Amount of Fetal Fluid

Day of Gestation Weight of Fetus30 0.3-0.5 gm40 1-1.5 gm50 3-6 gm60 8-30 gm70 25-100 gm80 120-200 gm90 200-400 gm120 1000-2000 gm150 3000-4000 gm180 5-10 kg210 8-18 kg240 15-25 kg270 20-25 kg

Weight of Fetus

Days of Gestation

Diameter of Uterine Artery

30405060708090 0.3-0.5 cm120 0.5-0.8 cm150 0.6-1.0 cm180 0.9-1.25 cm210 1.25-1.5 cm240 1.25-1.7 cm270 1.5-1.9 cm

Diameter of Uterine Artery

GESTATIONAL AND FETAL AGE

Gestational or menstrual age is measure of age of pregnancy where the origin is the females last estrous cycle.

Fetal age is the term that refers to the actual age of baby starting at the time of conception.

Fetal age is two weeks less than the gestational age.

MATHODS FOR THE ESTEMATION Method Variability Gestational ageDays from estimated ovulation

±3 days +14days

Days from artificial insemination

±3 days +14 days

Days from known single sexual intercourse

±3 days …

First trimester physical examination

±2 weeks …

Second trimester physical examination

±4 weeks …

Third trimester physical examination

±6 weeks …

…

ANY QUESTION?