Discussion of Clinically Oriented Problems

Mar 31, 2020 by in GENERAL Comments Off on Discussion of Clinically Oriented Problems

Chapter 1 1. The secondary sexual characteristics develop, reproductive functions begin, and sexual dimorphism becomes more obvious during puberty. The pubertal changes are not the same in males and females….

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Skeletal System

Mar 31, 2020 by in GENERAL Comments Off on Skeletal System

As the notochord and neural tube form in the third week, the intraembryonic mesoderm lateral to these structures thickens to form two longitudinal columns of paraxial mesoderm ( Fig. 14.1…

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Muscular System

Mar 31, 2020 by in GENERAL Comments Off on Muscular System

The muscular system develops from mesoderm , except for the muscles of the iris of the eye, which develop from neuroectoderm (neural crest cells) , and the muscles of the…

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Placenta and Fetal Membranes

Mar 31, 2020 by in GENERAL Comments Off on Placenta and Fetal Membranes

The placenta and fetal membranes separate the fetus from the endometrium , the inner layer of the uterine wall. An interchange of substances, such as nutrients and oxygen, occurs between…

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Respiratory System

Mar 31, 2020 by in GENERAL Comments Off on Respiratory System

The lower respiratory organs (larynx, trachea, bronchi, and lungs) begin to form during the fourth week of development. Respiratory Primordium 9 The respiratory system starts as a median outgrowth, the…

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Fetal Period: Ninth Week to Birth

Mar 31, 2020 by in GENERAL Comments Off on Fetal Period: Ninth Week to Birth

The transformation of an embryo to a fetus is gradual, but the name change is meaningful because it signifies that the primordia of all major systems have formed. Development during…

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Fourth to Eighth Weeks of Human Development

Mar 31, 2020 by in GENERAL Comments Off on Fourth to Eighth Weeks of Human Development

All major external and internal structures are established during the fourth to eighth weeks. By the end of this embryonic period, the main organ systems have started to develop. As…

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Third Week of Human Development

Mar 31, 2020 by in GENERAL Comments Off on Third Week of Human Development

Rapid development of the embryo from the trilaminar embryonic disc during the third week (see Fig. 4.3 H ) is characterized by: • Appearance of primitive streak • Development of…

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Second Week of Human Development

Mar 31, 2020 by in GENERAL Comments Off on Second Week of Human Development

As implantation of the blastocyst occurs, morphologic changes in the embryoblast produce a bilaminar embryonic disc composed of epiblast and hypoblast ( Fig. 3.1 A ). The embryonic disc gives…

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