página principal > dvd ilustrado plurilingüe

Este programa se distribuye en los Estados Unidos y Canadá por National Geographic y EHD. [obtenga más información]

Para comprar en línea: visite la tienda en línea de EHD

DVD ilustrado plurilingüe

La biología del desarrollo prenatal

8 semanas

6 meses hasta el nacimiento

THE BIOLOGY OF PRENATAL DEVELOPMENT

.English

Seleccionar idioma:

Descargar versión en formato PDF ¿Qué es PDF?

Mostrar Tabla de Contenidos


El embrión de 8 semanas Capítulo 30 8 semanas: desarrollo del cerebro

Reproducir película \| Ver fotos instantáneas	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 Cualidad de diestro y zurdo

Reproducir película \| Ver fotos instantáneas	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 Voltearse

Reproducir película \| Ver fotos instantáneas	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.
Reproducir película \| Ver fotos instantáneas	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.
Reproducir película \| Ver fotos instantáneas	Touching the embryo elicits squinting, jaw movement, grasping motions, and toe pointing.
Capítulo 33 Fusión de los párpados

Reproducir película \| Ver fotos instantáneas	Between 7 and 8 weeks, the upper and lower eyelids rapidly grow over the eyes and partially fuse together.
Capítulo 34 Movimiento respiratorio y micción

Reproducir película \| Ver fotos instantáneas	Although there is no air in the uterus, the embryo displays intermittent breathing motions by 8 weeks.
Reproducir película \| Ver fotos instantáneas	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): formación de alvéolos, agarre firme, preferencias de sabor

Reproducir película \| Ver fotos instantáneas	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 Resumen de las primeras 8 semanas

Reproducir película \| Ver fotos instantáneas	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.