Fetal development
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Transcript of Fetal development
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?