fetal development
Resource Center



fetal development in the news

Researchers digging for clues on pregnancy-induced hypertension 

Jewish World Review - Oct 09 1:12 AM
http://www.JewishWorldReview.com | (MCT) Sara and Gregory Bartel had barely begun to prepare the nursery for their first child when they learned that the baby might arrive in less than a week.

Bristol-Myers Squibb, Gilead Sciences and Merck & Co. Submit Marketing Authorisation Application for ATRIPLA(TM)  
RedNova - Oct 09 3:18 AM
PRINCETON, N.J., FOSTER CITY, Calif., and WHITEHOUSE STATION, N.J., Oct. 9 /PRNewswire-FirstCall/ -- Bristol-Myers Squibb Company , Gilead Sciences, Inc. and Merck & Co., Inc.

FDA Approves ZOLINZA(TM) (Vorinostat) for the Treatment of Cutaneous Manifestations in Patients with Cutaneous T-Cell  
[Press Release] Business Wire via Yahoo! Finance - 1 hour, 5 minutes ago
WHITEHOUSE STATION, N.J.----Merck & Co., Inc. announced today that the U.S. Food and Drug Administration has approved oral ZOLINZA 400 mg once daily for the treatment of cutaneous manifestations in patients with cutaneous T-cell lymphoma , a form of non-Hodgkin's lymphoma, who have progressive, persistent or recurrent disease on or following two systemic therapies.

Viral hitch-hikers that help a fetus survive 
New Scientist - Oct 05 9:56 AM
The stowaways hidden in the DNA of mammals could be more than just idle passengers - they could be crucial for fetal development

fetal devlopment



- stages of fetal development

- fetal development

Fetal (U.S. English; "Foetal" UK English) development is the process in which a fetus (U.S. English; "Foetus" fetal devlopment UK English) develops during gestation, from the times of conception until birth.


  • 1 Human fetal development
    • 1.1 Fertilization and Embryogenesis
    • 1.2 Fetal fetaldevelopment Development
    • 1.3 Changes by weeks of age (and weeks of fetal develpment pregnancy)
      • 1.3.1 Pre-implantation
      • 1.3.2 Embryonic fetal developmeny Period
      • 1.3.3 Fetal fetal development Period
  • 2 References
  • 3 External links

Human fetal development

Fertilization and Embryogenesis

Main article: Fertilization
A sperm fertilizing an ovum

When semen is deposited in the vagina, the spermatozoa human fetal development travel through the cervix fetal development at 12 weeks and body of the uterus and into the Fallopian tubes. Fertilization of fetal development photos the ovum (egg cell) usually takes place in the Fallopian tube. Many sperm must cooperate to penetrate the thick protective shell-like barrier pictures of fetal development that surrounds the ovum. The first sperm that penetrates essential fatty acids and fetal development fully into the egg donates its genetic material (DNA). The resulting combination is called a zygote. week by week fetal development The fetal development 18 weeks term "conception" refers variably to either fertilization or to formation of the conceptus, which occurs after uterine implantation.

Like every cell in fetal development at 11 weeks the body, the zygote contains all of the genetic information unique to an fetal development images individual. Half of the genetic timeline of fetal development information came from the mother's egg, and the other half from a single sperm. The zygote spends embryo and fetal development the next few days traveling down the Fallopian fetal development at 17 weeks tube. Meanwhile it divides several times to form a ball of cells called 4d ultrasound pictures of fetal development a morula. Further cellular division is accompanied by the formation of a small cavity between canine fetal development the cells. This stage is called a blastocyst. Up to this point there is no fetal development 24 weeks growth in the overall size of the embryo, fetal development 6 weeks so each division produces successively smaller cells.

The blastocyst reaches the uterus at roughly the fifth day fetal development stages after fertilization. The embryo "hatches" fetal lung development from its zona pellucida, a glycoprotein shell. It then adheres to the uterine lining and becomes embedded fetal development and stages of pregnancy in the endometrial cell layer. This process is also called fetal development at 34 weeks "implantation". In most successful human pregnancies, fetal development chart the conceptus implants 8 to 10 days after ovulation (Wilcox et al 1999). The inner cell mass forms the fetal development week by week embryo, while the outer cell layers form the membranes and placenta. Together, the embryo 24 weeks pregnancy information fetal development and its membranes are referred to as a conceptus, 26 weeks pregnancy fetal development or the "products of conception".

Rapid growth occurs and the embryo's down syndrome fetal development main external features begin to take form. This process is called differentiation, which produces the varied fetal brain development cell types (such as blood cells, kidney cells, and nerve cells). A spontaneous abortion, or fetal development 11 weeks miscarriage, in the first trimester of pregnancy fetal renal development is usually due to major genetic weekly fetal development pregnancy calendar mistakes or abnormalities in the developing embryo. During this critical period (most of stage 17 of fetal development the first trimester), the developing fetus is also susceptible to toxaemia and fetal brain development toxic exposures, such as:

  • Alcohol, certain drugs, and other toxins that cause birth defects
  • Infection (such as rubella or cytomegalovirus)
  • Radiation from x-rays or 30 weeks fetal development radiation therapy
  • Nutritional deficiencies such as lack factors affecting fetal development of folate which contributes to spina bifida

Fetal Development

From the fetal development - 20 weeks 9th week until birth (around 38 weeks), the developing human is called a fetus. The fetus is fetal development 16 weeks not as sensitive to damage from environmental exposures as the embryo. The majority of structures are fetal development 5 months already formed in the fetus, but they continue to grow and become functional.

Changes by weeks of age (and weeks fetal development calendar of pregnancy)

The following list describes specific changes in human development by fetal development weekly week. "Weeks of pregnancy" are dated by obstetricians from the start of the last menstrual foods for fetal heart development period which means that ovulation occurs at the end of the 2nd week.


Toxic exposures may smoking and fetal development cause prenatal death but do not cause developmental defects

  • Week 1 (3rd weekly fetal development week of pregnancy)
    • Fertilization of the ovum to form a zygote which undergoes mitotic weekly fetal development pregnancy cellular division, but does not increase in size. A hollow cavity forms marking the blastocyst stage.
    • The blastocyst contains only a 30 week fetal development thin effect of sleeping pills on fetal development rim of trophoblast cells and a clump of cells at one end known as the "embryonic pole" which include embryonic stem cells.
    • The blastocyst fetal development models hatches from its protein shell (zona pellucida) and implants onto fetal development photographs the endometrial lining of the mother's uterus.
    • If the free fetal development videos zygote is going to separate into identical twins, 1/3 of the time it will happen 16 week fetal development before day 5.[1]
  • Week 2 (4th week of pregnancy)
    • Trophoblast cells 6 weeks fetal development surrounding the embryonic cells proliferate and invade deeper into the uterine lining. They will actual pictures of fetal development eventually form the placenta and embryonic membranes.
    • Formation of betamethazone for fetal lung development the yolk sac.
    • The embryonic cells flatten into a disk, two-cells thick.
    • If the daily fetal development zygote is going to separate into identical twins, 2/3 of fetal alocohol syndrom child development the time it will happen between days 5 and 9. If it happens after day 9, there is a fetal development 31 weeks significant risk of the twins being conjoined.

Embryonic Period

Toxic exposures often cause major congenital malformations

  • Week 3 fetal development 9 weeks fetal development calender (5th week of pregnancy - first missed menstrual period)
    • A notochord forms in the center fetal development human and mouse of the embryonic disk.
    • A neural groove (future spinal cord) fetal development pics forms over the notochord with a brain bulge at one end.
    • Heart tubes begin to fuse.
  • Week 4 fetal or fetus or infants and development and alcohol (6th week of pregnancy)
    • The embryo measures 4 mm (1/8 inch) in free downloadable pictures of fetal development length and begins to curve into a C shape.
    • Somites, the divisions of the future vertebra, form.
    • The heart bulges, further things that affect fetal heart development develops, and begins to beat in a regular rhythm.
    • Branchial arches, ultrasound impact to fetal brain development grooves which will form structures of the face and clipart fetal development neck, form.
    • The neural tube closes.
    • The ears begin to form as otic early fetal heart development pits.
    • Arm buds and a tail are visible.
  • Week 5 (7th week of pregnancy)
    • The embryo equine fetal development measures 8 mm (1/4 inch) in length.
    • Lens pits and optic cups form fetal development 10 weeks the start of the developing eye.
    • A primitive fetal development 11 weeks 1 day mouth and nasal pits form.
    • The brain divides into 5 vesicles, including the early telencephalon.
    • Leg buds form and hands form as flat paddles on the fetal development 22 weeks arms.
    • Rudimentary blood fetal development 25 weeks moves through primitive vessels connecting to the yolk sac and chorionic membranes.
  • Week 6 (8th week of pregnancy)
    • The embryo measures 13 mm fetal development 35 weeks (1/2 inch) in fetal development 5 weeks length.
    • Lungs begin to form.
    • The brain continues to develop.
    • Arms and legs have lengthened with foot and fetal development and legs crossed hand areas distinguishable.
    • The hands and feet have digits, but fetal development at 22 weeks may still be webbed.
  • Week 7 (9th week of pregnancy)
    • The embryo fetal development at 25 weeks measures 18 mm (3/4 inch) in length.
    • Nipples and hair follicles begin to form.
    • Location of the elbows and toes fetal development at 36 weeks are visible.
    • Spontaneous limb movements may be detected fetal development at 37weeks by ultrasound.
    • All essential organs have at least begun formation.
  • Week 8 (10th week of pregnancy)
    • Embryo measures 30 mm (1.2 inches) in length.
    • Intestines rotate.
    • Facial features fetal development by week continue to develop.
    • the eyelids are more developed.
    • the external features of the fetal development in sixth month ear begin to take their final shape.

Fetal Period

During the fetal development oxygen fetal period, toxic exposures fetal development sucking reflex often cause physiological abnormalities or minor congenital malformation

  • Weeks 9 to 12 (11th to 14th week fetal development week of pregnancy)
    • The fetus reaches a length of 8 cm (3.2 inches).
    • The head comprises nearly half of the fetus' size.
    • The face fetal development with twins is well formed fetal heart development and develops a human appearance.
    • The eyelids close and will not reopen until about the 28th free downloadable fetal development week.
    • Tooth buds, which will form the baby teeth, appear.
    • The limbs are long and free downloadable images of fetal development thin.
    • The fetus can make a fist with images of fetal development its fingers.
    • Genitals appear well differentiated.
    • Red blood cells are produced in the liver.
  • Weeks 13 to 16 (15th to minor disorder of pregnancy and fetal development 18th week of pregnancy)
    • The fetus reaches a length of about 15 cm (6 inches).
    • A fine positive effects of betamethazone for fetal lung development hair called lanugo develops on pro-choice / fetal development the head.
    • Fetal skin is almost transparent.
    • More muscle tissue and bones have developed, and the bones become harder.
    • The fetus makes active 19 week twin fetal development movements.
    • Sucking motions 19 weeks fetal development are made with the mouth.
    • Meconium is made in the intestinal tract.
    • The liver 20 weeks fetal development and pancreas produce fluid secretions.
  • Week 18 (20th week of pregnancy)
    • The fetus reaches a length of 20 33 weeks fetal development cm (8 inches).
    • Lanugo covers the entire body.
    • Eyebrows and eyelashes appear.
    • Nails appear on fingers affects of methamphetamine on fetal development and toes.
    • The fetus is more active with increased muscle development.
    • "Quickening" usually azt, fetal development occurs (the mother can feel the fetus moving).
    • The fetal heartbeat can be heard with a stethoscope.
  • Week 22 (24th brain development and fetal behavior week of pregnancy)
    • The fetus reaches a length of 28 cm (11.2 inches).
    • The fetus brain development and fetal behavior james byrne weighs about 725 g (1 lb cases on pregnancy with fetal development 10 oz).
    • Eyebrows and eyelashes are well formed.
    • All of the eye components are developed.
    • The fetus has a development fetal pregnancy stage hand and startle early pregnancy fetal development reflex.
    • Footprints and fingerprints continue forming.
    • Alveoli (air sacs) are forming in lungs.
  • Weeks 23 to 26 (25th fetal development (at) 36 weeks to 28th week of pregnancy)
    • The fetus reaches a fetal development 32 weeks length of 38 cm (15 inches).
    • The fetus weighs about 1.2 kg (2 lb 11 oz).
    • The brain develops rapidly.
    • The nervous fetal development 36 weeks system develops enough to control some body functions.
    • The eyelids open and close.
    • The respiratory fetal development 8 weeks system, while immature, has developed fetal development 9 months to the point where gas exchange is possible.
    • A baby born prematurely fetal development at 14 weeks at this time may survive, but the possibilities for complications and death remain high.
  • Weeks 27 to 31 (29th to 33rd fetal development at 15 weeks week of pregnancy)
    • The fetus fetal development at 30 weeks reaches a length of about 38-43 cm (15-17 inches).
    • The fetus weighs about 2 kg (4 lb 6 oz).
    • The amount of body fat rapidly fetal development at 5 weeks increases.
    • Rhythmic breathing movements occur, but fetal development at 6 weeks 2 days lungs are not fully mature.
    • Thalamic brain connections, which mediate fetal development calculator sensory input, form.
    • Bones are fully developed, but are still soft and pliable.
    • The fetus begins storing fetal development drug abuse amphetamines iron, calcium, and phosphorus.
  • Week 34 (36th week of pregnancy)
    • The fetus reaches a fetal development education curriculum length of about 40-48 cm (16-19 inches).
    • The fetus weighs about 2.5 to 3 kg fetal development first trimester (5 lb 12 oz to 6 lb 12 oz).
    • Lanugo begins to disappear.
    • Body fat increases.
    • Fingernails reach the end fetal development pictures 6 months fetal development pictures 7 months of the fingertips.
    • a baby born at 36 weeks has a high chance of survival, but may require medical interventions.
  • Weeks 35 to 38 (37th fetal development sonogram sezx determination to 40th week of preganancy)
    • The fetus is considered full-term fetal development stages images at the 37th week of pregnancy.
    • It may be 48 to 53 cm (19 to 21 inches) fetal development third trimester in length.
    • The lanugo fetal development week 4 is gone except on the upper arms and shoulders.
    • Fingernails extend beyond fingertips.
    • Small breast buds are present on fetal development week by week pictures both sexes.
    • Head hair is now coarse fetal renal development and bromeline and thicker


  • "MedlinePlus Medical Encyclopedia"
  • Moore, Keith L. The Developing Human: 3rd Edition. W.B. fetal sinus development Saunders Company, Philadelphia PA
  • Wilcox AJ, Baird DD, Weinberg CR. Time fraternal twins fetal development of implantation of the conceptus and loss of pregnancy. 1999 N Engl J Med. 340(23):1796-9. PMID 10362823
  • Ljunger, E, Cnattingius, S, homosexuality fetal development Lundin, C, & Annerén, G. 2005 Chromosomal anomalies in first-trimester miscarriages. Acta Obstetricia methamphetamine use and fetal development et Gynecologica methamphetamines, pregnancy, fetal development Scandinavica 84(11):1103-1107. PMID 10362823

External links

  • The Changes in Each Stage of Human Development

Mammalian development of embryo and development and patients cases on pregnancy with fetal development fetus (some dates are approximate pregnancy + fetal development - see Carnegie stages) - edit

Week 1: Zygote | Morula | Blastula/Blastomere/Blastosphere | Archenteron/Primitive streak | Blastopore | Allantois | Trophoblast pregnancy and fetal development (Cytotrophoblast | Syncytiotrophoblast | Gestational sac)

Week 2: Yolk sac | Vitelline pregnancy pics fetal development duct | pregnancy stages of fetal development Bilaminar disc

Week 3: Hensen's node | Gastrula/Gastrulation | Trilaminar embryo Branchial arch (1st) | Branchial pouch | Meckel's stages in fetal development cartilage | Somite/Somitomere | Germ layer (Ectoderm, Endoderm, Mesoderm, Chordamesoderm, Paraxial stages of fetal development during pregnancy mesoderm, Intermediate mesoderm, Lateral plate mesoderm)

Histogenesis and Organogenesis

Circulatory system: Primitive twins and fetal development atrium | Primitive ventricle | Bulbus cordis | Truncus arteriosus | Ostium primum | Foramen ultrasound fetal development brain ovale | Ductus venosus | Ductus arteriosus week by week pictures of fetal development | Aortic arches | Septum primum | Septum secundum | Cardinal veins

Nervous system: Neural development/Neurulation | Neurula | Neural folds | Neural groove | Neural tube | Neural crest | Neuromere (Rhombomere) | Notochord | Optic vesicles | Optic stalk | Optic cup

Digestive system: Foregut | Midgut | Hindgut | Proctodeum | Rathke's pouch | Septum transversum

Urinary/Reproductive system: Urogenital folds | Urethral groove | Urogenital sinus | Kidney development (Pronephros | Mesonephros | Ureteric bud | Metanephric blastema) | Fetal genital development (Wolffian duct | Müllerian duct | Gubernaculum | Labioscrotal folds)

Glands: Thyroglossal duct

Uterine support: Placenta | Umbilical cord (Umbilical artery, Umbilical vein, Wharton's jelly) | Amniotic sac (Amnion, Chorion)

Search Term: "Fetal_development"

- embryo fetal development

fatal development