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The Biology of Prenatal Development


4 - 6 Meses


THE BIOLOGY OF PRENATAL DEVELOPMENT

.English


 

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Capítulo 41   4 a 5 Meses (16 a 20 Semanas): Resposta ao Estresse, Verniz Caseoso, Ritmos Circadianos

Reproduzir Filme - Hormonal Stress Response
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Reproduzir Filme - Movement
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By 16 weeks, procedures involving the insertion of a needle into the abdomen of the fetus trigger a hormonal stress response releasing noradrenaline, or norepinephrine, into the bloodstream.

Reproduzir Filme - Bronchial Tree
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In the respiratory system, the bronchial tree is now nearly complete.

Reproduzir Filme - Vernix Caseosa
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A protective white substance, called vernix caseosa, now covers the fetus. Vernix protects the skin from the irritating effects of amniotic fluid.

Reproduzir Filme - Circadian Rhythms
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From 19 weeks fetal movement, breathing activity, and heart rate begin to follow daily cycles called circadian rhythms.

Capítulo 42   6 a 7 Meses (24 a 28 Semanas): Reflexo Cócleo-Palpebral e de Sobressalto; Pupilas Respondem à Luz; Olfato e Paladar

Reproduzir Filme - Responds to Sound
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By 20 weeks the cochlea, which is the organ of hearing, has reached adult size within the fully developed inner ear. From now on, the fetus will respond to a growing range of sounds.

Reproduzir Filme - Skin and Hair
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Hair begins to grow on the scalp.

All skin layers and structures are present, including hair follicles and glands.

Reproduzir Filme - Age of Viability
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By 21 to 22 weeks after fertilization, the lungs gain some ability to breathe air. This is considered the age of viability because survival outside the womb becomes possible for some fetuses.
4 - 6 Meses