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The Biology of Prenatal Development

8 - 12 Semanas

THE BIOLOGY OF PRENATAL DEVELOPMENT

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O Período Fetal (8 semanas até o Nascimento) Capítulo 37 9 Semanas: Engole, Suspira e se Estica

Reproduzir Filme \| Veja Instantâneos	The fetal period continues until birth.
Reproduzir Filme \| Veja Instantâneos	By 9 weeks, thumb sucking begins and the fetus can swallow amniotic fluid.
Reproduzir Filme \| Veja Instantâneos	The fetus can also grasp an object, move the head forward and back, open and close the jaw, move the tongue, sigh, and stretch. Nerve receptors in the face, the palms of the hands, and the soles of the feet can sense light touch. "In response to a light touch on the sole of the foot," the fetus will bend the hip and knee and may curl the toes.
Reproduzir Filme \| Veja Instantâneos	The eyelids are now completely closed.
Reproduzir Filme \| Veja Instantâneos	In the larynx, the appearance of vocal ligaments signals the onset of vocal cord development.
Reproduzir Filme \| Veja Instantâneos	In female fetuses, the uterus is identifiable and immature reproductive cells, called oogonia, are replicating within the ovary. External genitalia begin to distinguish themselves as either male or female.
Capítulo 38 10 Semanas: Revira os olhos e Boceja, Unhas e Impressões Digitais

Reproduzir Filme \| Veja Instantâneos	A burst of growth between 9 and 10 weeks increases body weight by over 75%.
Reproduzir Filme \| Veja Instantâneos	By 10 weeks, stimulation of the upper eyelid causes a downward rolling of the eye. The fetus yawns and often opens and closes the mouth.
Reproduzir Filme \| Veja Instantâneos	Most fetuses suck the right thumb. Sections of intestine within the umbilical cord are returning to the abdominal cavity.
Reproduzir Filme \| Veja Instantâneos	Ossification is underway in most bones.
Reproduzir Filme \| Veja Instantâneos	Fingernails and toenails begin to develop.
Reproduzir Filme \| Veja Instantâneos	Unique fingerprints appear 10 weeks after fertilization. These patterns can be used for identification throughout life.
Capítulo 39 11 Semanas: Absorve Glicose e Água

Reproduzir Filme \| Veja Instantâneos	By 11 weeks the nose and lips are completely formed. As with every other body part, their appearance will change at each stage of the human life cycle.
Reproduzir Filme \| Veja Instantâneos	The intestine starts to absorb glucose and water swallowed by the fetus.
Reproduzir Filme \| Veja Instantâneos	Though sex is determined at fertilization, external genitalia can now be distinguished as male or female.