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HOW TO BUILD A HUMAN Human embryo and fetus development from fertilization to birth Eleanor Lutz 2014 TabletopWhale.com L1 M1 N1 24 21 25 26 20 27 BIRTH 29 42 30 41 40 39 B1 38 34 35 10 12 D1 F1 E1 Detailed descriptions below Number of weeks since the last menstrual cycle Ectoderm Mesoderm ★ Typical age range at birth Endoderm Epiblast A. Fertilized egg B. 2-cell stage C. 4-cell stage D. 8-cel stage E. Compacted 8-ce F. Morula G. Blastocyst H. ICM growth I. Bilaminar germ disk J. Amniotic cavity/yolk sac K. Implantation complete L. Extraembryonic mesoderm M. (Zoom) N. Hypoblast cells replacedV. Primitive gut tube forms O. Mesoderm immigration P. Ectoderm formation Q. Primary neurulation R. Secondary neurulation S. Neurulation complete T. (Rotate view) U. Embryonic folding Y. Upper limb bud forms Z. Lower limb bud forms A1. Hand plate forms B1. Webbed fingers and toes C1. Fingers/toes separate D1. Gonads differentiate by sex E1. Eyelids form F1. Iris develops G1. Second trimester H1. Taste pores develop l1. Fotus weighs about 100g J1. Vernix caseosa covers skin K1. Lanugo replaced by vellus L1. HPA axis established M1. Fetus weighs about 500g N1. >50% survival if born W. (Inside to outside view) X. Major blood vessels form

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Uploaded Jan 31, 2015 at 07:25PM EST

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