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Human Fetal Period

9th week development

The period from the beginning of the ninth week to birth is known as fetal period. During this period, differentiation …

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Birth Defects


Any structural, behavioral or metabolic disorders present at birth are known as birth defects. Other related terms include: a. Teratology/Dysmorphology …

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Derivatives of Endoderm (Embryonic Period)


The endoderm germ layer covers the ventral surface of the embryo forming the roof of the yolk sac. The GIT …

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Derivatives of Mesoderm (Embryonic Period)

•Initially cells of mesodermal germ layer forms a thin sheet of loosely woven tissue on each side of midline. Paraxial …

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Derivatives of Ectodermal Germ Layer (Embryonic Period)

Human Embryonic Period (3rd to 8th Week) This is the organogenetic period in which all major external and internal structures …

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First and second week of development

First week of development CLEAVAGE Cleavage is the series of mitotic cell divisions of the zygote, resulting in the formation …

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The reproductive system of the male has two major functions: Production of sperm Delivery of these to the reproductive tract …

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Oogenesis and Ovarian Cycle

PRIMORDIAL GERM CELLS —Gametes are derived from PGCs. Formed in the epiblast during 2nd week and move to the wall …

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Chromosomal Abnormalities

Causes of birth defects and spontaneous abortions are two fold: 1. Chromosomal abnormalities 2. Genetic factors Incidence For Major Chromosomal …

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Mitosis and Meiosis

CHROMOSOMES Are structures composed of condensed DNA and associated proteins When DNA condenses, the molecule becomes wrapped around proteins called …

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