Stage of Prenatal Development Essay - 892 Words.

An Introduction to the Analysis of Stages of Pregnancy. Stages of Development Pregnancy typically lasts 40 weeks, counting from the first day of the woman's last menstrual period, and is often referred to in three parts, called trimesters. The first trimester lasts 12 weeks, the second is from 13 to 27 weeks, and the third is from 28 to 40 weeks. These divisions, however, are r.

Prenatal Development Prenatal development is the period in development from conception to the onset of labor. Perinatal period is the period beginning about the seventh month of pregnancy and continuing until about four weeks after birth. Postnatal development is the period in developme.

The first trimester or stage is the germinal period or the zygotic period. It is the first two weeks of prenatal development. Near the end of the two weeks the single-celled a zygot, developes into a cluster of cells called the embryo.The second stage or trimester is called the embryonic period, which is week three through week eight.

Essay Factors Affecting Prenatal Development. a. Since the placenta cannot filter out extremely small disease carriers, such as viruses, children can be born with malaria, measles, chicken pox, mumps, syphilis, or other venereal diseases that have been transmitted from the mother.

Prenatal Development The brain is among the first body parts to specialize and function in the embryo. It originates as a flat sheet of cells on the upper surface, called the neural plate. The brain begins to develop between the second and third week after fertilization and continue to develop rapidly throughout gestation (Spear 406-407).

According to dictionary.com a teratogen is “a drug or other substance capable of interfering with the development of a fetus, causing birth defects”. Teratogens are also substances that are found in the environment which are known to cause defects in fetal development. Teratogens are one of the leading causes of death to newborns in the nation.

Prenatal period is one of the stages in the development of a fetus. During pregnancy, the unborn child goes through numerous stages of development. The changes usually happen gradually and progressively to ensure that all the parts of the fetus are properly developed, with just the right biological compositions.

Fetal development, also known as prenatal development, is the process by which a fertilized human egg grows into a fetus and is born as a viable human being. This process occurs in stages and can be delineated through each week of pregnancy. Paper Masters can compose a custom written research paper on fetal development that follows your guidelines.

Fetal development is the third of the three stages of prenatal development, following from the initial germinal stage (preembryonic stage), and stage of embryonic development.These stages are also referred to in pregnancy as terms or trimesters. From the 10th week of gestation (8th week of development), the developing organism is called a fetus.

Essays, Term Papers, Book Reports, Research Papers on Psychology. Free Papers and Essays on Prenatal Development. We provide free model essays on Psychology, Prenatal Development reports, and term paper samples related to Prenatal Development.

Contents Chapter 1. Introduction 9 Chapter 2. Prenatal determinants of behavior and cognition 2.1 Maternal psychological distress and fetal growth trajectories 21 2.2 Maternal pre- and postnatal anxiety and infant temperament 43 2.3 Parental family stress during pregnancy and cognitive development 65 2.4 Maternal thyroid function in early pregnancy and cognitive.

Prenatal development of all anthropoid primates closely resembles that of humans and textbooks of human embryology may be consulted for information relating to the general sequence and pattern of developmental events. However, gestational length and the precise duration and timing of specific events varies considerably from species to species.