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The Biology of Prenatal Development

8 Semanas

THE BIOLOGY OF PRENATAL DEVELOPMENT

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Um Embrião de 8 Semanas Capítulo 30 8 Semanas: Desenvolvimento do Cérebro

Reproduzir Filme \| Veja Instantâneos	At 8 weeks the brain is highly complex and constitutes almost half of the embryo's total body weight. Growth continues at an extraordinary rate.
Capítulo 31 Característica de Destro e Canhoto

Reproduzir Filme \| Veja Instantâneos	By 8 weeks, 75% of embryos exhibit right-hand dominance. The remainder is equally divided between left-handed dominance and no preference. This is the earliest evidence of right- or left-handed behavior.
Capítulo 32 Virar

Reproduzir Filme \| Veja Instantâneos	Pediatric textbooks describe the ability to "roll over" as appearing 10 to 20 weeks after birth. However, this impressive coordination is displayed much earlier in the low-gravity environment of the fluid-filled amniotic sac. Only the lack of strength required to overcome the higher gravitational force outside the uterus prevents newborns from rolling over.
Reproduzir Filme \| Veja Instantâneos	The embryo is becoming more physically active during this time. Motions may be slow or rapid, single or repetitive, spontaneous or reflexive. Head rotation, neck extension, and hand-to-face contact occur more often.
Reproduzir Filme \| Veja Instantâneos	Touching the embryo elicits squinting, jaw movement, grasping motions, and toe pointing.
Capítulo 33 Fusão da Pálpebra

Reproduzir Filme \| Veja Instantâneos	Between 7 and 8 weeks, the upper and lower eyelids rapidly grow over the eyes and partially fuse together.
Capítulo 34 Movimento de Respiração e Micção

Reproduzir Filme \| Veja Instantâneos	Although there is no air in the uterus, the embryo displays intermittent breathing motions by 8 weeks.
Reproduzir Filme \| Veja Instantâneos	By this time, kidneys produce urine which is released into the amniotic fluid. In male embryos, the developing testes begin to produce and release testosterone.
Capítulo 35 8 a 9 Meses (32 a 36 Semanas): Formação dos Alvéolos, Segurar com Força, Preferências de Gosto

Reproduzir Filme \| Veja Instantâneos	The bones, joints, muscles, nerves, and blood vessels of the limbs closely resemble those in adults. By 8 weeks the epidermis, or outer skin, becomes a multi-layered membrane, losing much of its transparency. Eyebrows grow as hair appears around the mouth.
Capítulo 36 Resumo das Primeiras 8 Semanas

Reproduzir Filme \| Veja Instantâneos	Eight weeks marks the end of the embryonic period. During this time, the human embryo has grown from a single cell into the nearly 1 billion cells which form over 4,000 distinct anatomic structures. The embryo now possesses more than 90% of the structures found in adults.