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The Biology of Prenatal Development

6 - 8 Semanas

THE BIOLOGY OF PRENATAL DEVELOPMENT

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Desenvolvimento Embrionário: 6 a 8 Semanas Capítulo 20 6 Semanas: Movimento e Sensação

Reproduzir Filme \| Veja Instantâneos	By 6 weeks the cerebral hemispheres are growing disproportionately faster than other sections of the brain. The embryo begins to make spontaneous and reflexive movements. Such movement is necessary to promote normal neuromuscular development.
Reproduzir Filme \| Veja Instantâneos	A touch to the mouth area causes the embryo to reflexively withdraw its head.
Capítulo 21 A Orelha Externa e a Formação de Célula Sanguínea

Reproduzir Filme \| Veja Instantâneos	The external ear is beginning to take shape.
Reproduzir Filme \| Veja Instantâneos	By 6 weeks, blood cell formation is underway in the liver where lymphocytes are now present. This type of white blood cell is a key part of the developing immune system.
Capítulo 22 O Diafragma e os Intestinos
	The diaphragm, the primary muscle used in breathing, is largely formed by 6 weeks.
Reproduzir Filme \| Veja Instantâneos	A portion of the intestine now protrudes temporarily into the umbilical cord. This normal process, called physiologic herniation, makes room for other developing organs in the abdomen.
Capítulo 23 Placas da Mão e Ondas Cerebrais

Reproduzir Filme \| Veja Instantâneos	At 6 weeks the hand plates develop a subtle flattening.
Reproduzir Filme \| Veja Instantâneos	Primitive brainwaves have been recorded as early as 6 weeks and 2 days.
Capítulo 24 Formação do Mamilo

Reproduzir Filme \| Veja Instantâneos	Nipples appear along the sides of the trunk shortly before reaching their final location on the front of the chest.
Capítulo 25 Desenvolvimento dos Membros

Reproduzir Filme \| Veja Instantâneos	By 6 1/2 weeks, the elbows are distinct, the fingers are beginning to separate, and hand movement can be seen.
Reproduzir Filme \| Veja Instantâneos	Bone formation, called ossification, begins within the clavicle, or collar bone, and the bones of the upper and lower jaw.
Capítulo 26 7 Semanas: Soluços e Resposta a Susto

Reproduzir Filme \| Veja Instantâneos	Hiccups have been observed by 7 weeks. Leg movements can now be seen, along with a startle response.
Capítulo 27 O Coração Desenvolvido

Reproduzir Filme \| Veja Instantâneos	The 4-chambered heart is largely complete. On average, the heart now beats 167 times per minute. Electrical activity of the heart recorded at 7 1/2 weeks reveals a wave pattern similar to the adult's.
Capítulo 28 Ovários e Olhos

Reproduzir Filme \| Veja Instantâneos	In females, the ovaries are identifiable by 7 weeks.
Reproduzir Filme \| Veja Instantâneos	By 7 1/2 weeks, the pigmented retina of the eye is easily seen and the eyelids are beginning a period of rapid growth.
Capítulo 29 Dedos das Mãos e dos Pés

Reproduzir Filme \| Veja Instantâneos	Fingers are separate and toes are joined only at the bases.
Reproduzir Filme \| Veja Instantâneos	The hands can now come together, as can the feet. Knee joints are also present.