By the end of the sixth month, the fetus is about 12 inches long and weighs about 2 pounds. As the fertilized egg grows, a water-tight sac forms around it, gradually filling with fluid. Embryogenesis is a term that can be used to describe all of the processes of embryo development up until the time it becomes a fetus. Fingernails and toenails are beginning to develop and the external ears are formed. During the prenatal period, the developing individual begins life as a zygote, then becomes a ball of cells called a morula, and eventually becomes a blastocyst that implants in the endometrium. d. polygenic inheritance, ________ reflects the combined activity of a number of distinct genes. The fetus is approximately an inch long when it enters the fetal stage but will be around twenty inches at birth. During this stage, the fetus continues to grow and mature. a. down-syndrome Researchers estimate that approximately 60% of all natural conceptions never become properly implanted in the uterus, which results in the new life ending before the mother is ever aware she is pregnant. Review the Parser class of zuul-better to also see how it uses the Scanner class. After the eighth week, it's called a fetus until its born. Your uterus, however, is still a busy place. At the end of this lesson, you'll be able to: To unlock this lesson you must be a Study.com Member. The fetus continues to mature and develop reserves of body fat. You may also start to feel movement as the fetus flips and turns in the uterus. From beginning as a one-cell structure to your birth, your prenatal development occurred in an orderly and delicate sequence. The fetus is about 17 to 19 inches long and weighs from 5 pounds to 6 pounds. Conception is also the beginning of the germinal period of prenatal development. b. scaffolding The lungs are close to being fully developed at this point. Now, let's look at how Steve and Jennifer's baby has been preparing for birth over the last 9 months. During the germinal stage, the baby is not referred to as a baby but rather as a zygote. The germinal stage takes place in the fallopian tubes of the mother's body for the most part. c. FAS The last few weeks of pregnancy are divided into the following groups: Talk to your healthcare provider about any questions you may have about gestational age and due date. antenatal period means the period from the start of the pregnancy to the onset of labour; " maternity medical services " means-. By about 16 to 20 weeks: Typically, the pregnant woman can feel the fetus moving. Between the ninth and twelfth week of gestation (at the earliest), reflexes begin to emerge. Your baby will open his or her eyes, gain more weight, and prepare for delivery. The embryonic stage plays an important role in the development of the brain. By the eighthweekof development, the embryo has all of the basic organs and parts except those of the sex organs. Verywell Mind's content is for informational and educational purposes only. Growth of the fetus is continued during this stage of prenatal development. By the eighth week of pregnancy, the embryo develops into a fetus. Our editors will review what youve submitted and determine whether to revise the article. Now that you understand the prenatal stages and development of a human baby, it's time to apply your knowledge. You will either have a menstrual period or become pregnant. which of the following is NOT a period of prenatal development, the organ systems rudimentarily form during the, sperm acrosomal enzymes disrupt the zone pellucida, which of the following is one of the events of fertilization, the extra embryonic membrane that contains the embryo and secretes a fluid that protects the embryo is the, the hollow ball of cells that implants into the uterine wall is called the, during fertilization, a sperm fuses with an, the fusion of a sperm cell and secondary oocyte is known as, what follows immediately after fertilization occurs, after fertilization, a zygote rapidly divides to produce small, genetically identical cells known as, when do the extra embryonic membranes form, in human, from which extra embryonic membrane will the first blood cells arise, provides nutrition for the developing embryo, which of the following is NOT a function of amniotic fluid, which extra embryonic membrane forms the embryonic part of the placenta, this germ layer forms the gonads, kidneys, and spleen of the developing embryo, the majority of the liver, the gallbladder, and pancreas are formed by this germ layer, this germ layer forms the majority of the nervous system and sense organs, the thyroid gland, parathyroid glands, and the thymus are formed by this germ layer, the pigment cells of the skin, cells of the adrenal medulla, and connective tissue cells are formed by this germ layer, this germ layer forms most of the cardiovascular system, which of the following steps must occur first during the embryonic period, what process starts at the embryonic period, which of the following is the inner germ layer, what is the first major event of organogenesis, which germ layer forms the gonads and kidneys, by what week of prenatal development will the placenta be established, what is NOT allowed to pass through the placental barrier between maternal and fetal blood supplies, during which month of prenatal development will the fetus begin to develop reflexes, approximately how many days after fertilization is a fetus considered full term and ready to be born, which of the following vascular shunts connects the fetal left and right atria, which of the following hormones maintains the corpus lute for the first 2 months of pregnancy until the placenta forms, the last stage of delivery is the ______ stage, which of the following hormones is NOT associated with parturition, which hormone suppresses uterine contractions until birth, labor progresses through the following three stages, what major event occurs during the first stage of labor, placenta and attached fetal extra embryonic membranes, which hormones stimulate the growth of alveoli in the mothers mammary gland, the physical manifestation of a gene as a trait, the two alleles that code for a trait are different, the two alleles that code for a trait are the same, which of the following is an inherited trait influenced by multiple alleles, in the case of blood types, both alleles A and B may be expressed as the phenotype. If born prematurely, your baby would be likely to survive after the seventh month. succeed. Psychology 103: Human Growth and Development, Psychological Research & Experimental Design, All Teacher Certification Test Prep Courses, Theoretical Approaches to Human Growth and Development, Research Methods and the Study of Human Growth and Development, Prenatal Stages and Development: Germinal, Embryonic & Fetal Period, The Prenatal Environment and Hazards to Healthy Prenatal Development, The Impact of Mother's Emotional and Physical State on the Prenatal Environment, The Perinatal Environment and Potential Hazards During the Birth Process, The Neonatal Environment: Definition & Apgar Test, The Newborn: Capabilities, Growth, and Developmental Milestones, Sexual Development and Maturation of the Adolescent, Physical, Psychological and Emotional Changes in Adults, Introduction to Psychology: Tutoring Solution, Educational Psychology: Homework Help Resource, Research Methods in Psychology: Certificate Program, Research Methods in Psychology: Help and Review, Introduction to Psychology: Homework Help Resource, Research Methods in Psychology: Homework Help Resource, Research Methods in Psychology: Tutoring Solution, UExcel Abnormal Psychology: Study Guide & Test Prep, ILTS Social Science - Psychology (248): Test Practice and Study Guide, ILTS School Psychologist (237): Test Practice and Study Guide, FTCE School Psychologist PK-12 (036) Prep, The Fetal Period of Pregnancy: Definition & Development, Fetal Development By Trimester: Timeline of Body Systems, Body Structures of Gestation: Medical Terminology, Fetal Development: Stages, Structures & Environmental Factors, Mental Health Classification Systems: Pros & Cons, Characteristics of a Mentally Healthy Person, Psychological Research: Influencing Factors & Examples, Individual & Group Differences in Human Abilities, Working Scholars Bringing Tuition-Free College to the Community, The innermost layer will become the digestive and respiratory systems of the baby and is known as the, Summarize what happens during each of the three stages of prenatal development, List the three germ layers that form during the embryonic period and identify what each ultimately develops into, Describe the most notable change that occurs during the fetal period, Brochure is focused on an audience of prospective parents, Brochure includes information about the development through the germinal, embryonic and fetal periods. Once you get close to the end of your pregnancy, there are several category names you might hear regarding when you go into labor. Within 24 hours after fertilization, the egg that will become your baby rapidly divides into many cells. This stage lasts from implantation until about 8 weeks from the time of conception (or the 10th week of pregnancy). Whether patients are referred to us or already have a Cleveland Clinic ob/gyn, we work closely with them to offer treatment recommendations and follow-up care to help you receive the best outcome. c. Y chromosome The two pronuclei next approach, meet midway in the egg cytoplasm, and lose their nuclear membranes. c. Turner's syndrome Each blastomere receives the full complement of paternal and maternal chromosomes. This exemplifies, in order for a male to inherit a sex linked disorder, he must achieve the allele from, Nuclear Medicine Registry Review: Procedures, John David Jackson, Patricia Meglich, Robert Mathis, Sean Valentine, David N. Shier, Jackie L. Butler, Ricki Lewis. c. phenotype c. inherited traits a. alleles. But what exactly are the stages of prenatal development? 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Middle Childhood: Age & Physical Development | What is Middle Childhood Development? a. eugenics b. fetus I feel like its a lifeline. Expand All First trimester (week 1-week 12) Second trimester (week 13-week 28) Third trimester (week 29-week 40) Your developing baby The embryonic stage begins at about the beginning of the third week after conception. The placenta will form that will supply the embryo with oxygenated blood and food and will remove waste from the embryo. If there are two Xs, its a girl. Progesterone helps prepare the endometrium (lining of the uterus). Though it may seem strange, the date of the first day of your last period will be an important date when determining your due date. The central nervous system begins to form around week four of embryogenesis. The prenatal period reflects a time when the embryo or fetus is particularly sensitive to environmental insult from maternal experiences. It begins in a Fallopian tube when an ovum is fertilized by a . Find out what's happening with you and your baby in these three stages. I would definitely recommend Study.com to my colleagues. By the end of the month, all parts of the body will be formed. You may see the week first (38) and then youll see two numbers separated by a slash mark (6/7). By the end of the first month, the fetus is about 1/4 inch long smaller than a grain of rice. Verywell Mind uses only high-quality sources, including peer-reviewed studies, to support the facts within our articles. It remains in the fallopian tube for about three days after conception. The fetus changes position frequently and responds to stimuli, including sound, pain and light. Once cell differentiation is mostly complete, the embryo enters the next stage and becomes known as afetus. b. chromosome 23 a. chromosome 1 We do not endorse non-Cleveland Clinic products or services. b. chromosome 23 The fetus continues to grow in both weight and length, although the majority of the physical growth occurs in the later stages of pregnancy. a. recessive By the end of the embryonic period, the basic structures of the brain and central nervous system have been established. From the moment of conception, the hormone human chorionic gonadotrophin (hCG) will be present in your blood. Each resolves its diffuse chromatin material into a complete single set of 23 chromosomes. The last organs to develop are the lungs and liver. c. Turner's syndrome This is the most important time of prenatal development because the embryo is developing the foundations for a healthy baby. For example, a student might make a cover that says something like, "what to expect during your pregnancy" and then create an individual panel for each of the topics. A fetus in the fetal development stages where organs develop. This stage takes place from the end of the embryonic period until the time of birth (or the 10th to 40th weeks of pregnancy). These germ layers will continue to differentiate until they become the organs they are supposed to be. On average, fertilization happens about two weeks after your last menstrual period. Throughout the third trimester, the fetus gains weight quickly, adding body fat that will help after birth. a. animism These vesicles will eventually develop into parts of the brain, including the structures of the forebrain, midbrain, and hindbrain.. Track the development of a human being from embryo to fetus to newborn. d. recessive, a _________ allele's instructions are ingnored. 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