Embryological And Fetal Development Pdf

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To review the recent data about eyelid morphogenesis, and outline a timeline for eyelid development from the very early stages during embryonic life till final maturation of the eyelid late in fetal life. The authors extensively review major studies detailing human embryologic and fetal eyelid morphogenesis.

Embryologic and Fetal Development of the Human Eyelid

Throughout this chapter, we will express embryonic and fetal ages in terms of weeks from fertilization, commonly called conception. It can be subdivided into distinct gestational periods. The first 2 weeks of prenatal development are referred to as the pre-embryonic stage. A developing human is referred to as an embryo during weeks 3—8, and a fetus from the ninth week of gestation until birth. By the end of the embryonic period, all of the organ systems are structured in rudimentary form, although the organs themselves are either nonfunctional or only semi-functional.

The start of pregnancy is actually the first day of your last menstrual period. This is called the gestational age, or menstrual age. Your healthcare provider will ask you about this date and will use it to figure out how far along you are in your pregnancy. Each month, your body goes through a reproductive cycle that can end in one of two ways. You will either have a menstrual period or become pregnant. This cycle is continuously happening during your reproductive years—from puberty in your teen years to menopause around age

Human Fetal Growth and Development

Al-Daraji, H. The influence of dietary arginine supplementation on blood traits of broiler chickens. Pakistan Journal of Nutrition Al-Mashadani, W. Al-Hayani, A.

Prenatal development , also called antenatal development , in humans, the process encompassing the period from the formation of an embryo , through the development of a fetus , to birth or parturition. The human body , like that of most animals, develops from a single cell produced by the union of a male and a female gamete or sex cell. This union marks the beginning of the prenatal period, which in humans encompasses three distinct stages: 1 the pre-embryonic stage, the first two weeks of development, which is a period of cell division and initial differentiation cell maturation , 2 the embryonic period, or period of organogenesis , which lasts from the third to the eighth week of development, and 3 the fetal period , which is characterized by the maturation of tissues and organs and rapid growth of the body. The prenatal period ends with parturition and is followed by a long postnatal period. Only at about age 25 years are the last progressive changes completed. Much of the embryonic developmental machinery the cellular apparatus used in human development is similar to that used by other vertebrates as well as some invertebrates. The machinery is essential for four processes: cell proliferation, cell specialization, cell interaction, and cell movement.


Embryonic & Fetal Development is one of two documents available to you as part Retrieved from katcompany.org


28.2: Embryonic Development

This book addresses the complexities of growth and maturation, structural and functional developments as well as differentiations of the human fetus. The data collected over many decades provides a deep insight into the growth and development of the human fetus, its aberrations and implications for understanding the intricacies and complexities of growth regulation up to twenty weeks of gestation. The editors bring together this extensive research from IPGMER, in addition to astute and precision research from global leaders in the fields of genetics, proteomics stem cell biology, endocrinology and molecular biology. Human Fetal Growth and Development — First and Second Trimesters is a pioneering work, stimulating further allied research in this area, and will be of interest to gynecologists, pediatricians, obstetricians, neonatologists, endocrinologists, reproductive and molecular biologists, and all students of medicine at all levels. Skip to main content Skip to table of contents.

2 Response
  1. Monslpalarlon

    While you might think of child development as something that begins during infancy, the prenatal period is also considered an important part of the developmental process.

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