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Title: Development Of The Human Zygote

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Subject: Science
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Date: February 12, 1998
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Length: 9 / 2478
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This cellular multiplication in the embryonic disc marks the beginning of a thickening in the midline that is called the primitive streak. Cells spread out laterally from the primitive streak between the ectoderm and the endoderm to form the mesoderm...

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These three germ layers, which are the origins of many structures as shown in Table 1, begin to develop. Table 1: Normal Germ Layer Origin of Structures in Some or all Vertebrates (Harrison, 1969) Normal Germ Layer Origin of Structures in Some or All Vertebrates Ectoderm Mesoderm Endoderm Skin epidermis Hair Feathers Scales Beaks Nails Claws Sebaceous, sweat, and mammary glands Oral and anal lining tooth enamel Nasal epithelium Lens of the eye Inner earBrainSpinal cordRetina and other eye partsNerve cells and gangliaPigment cellsCanal of external earmedulla of the adrenal glandPituitary gland Dermis of the skinConnective tissueMusclesSkeletal componentsOuter coverings of the eyeCardiovascular system Heart Blood cells Blood vesselsKidneys and excretory ductsGonads and reproductive ductsCortex of the adrenal glandSpleenLining of coelomic cavitiesMesenteries LiverGall bladderPancreasThyroid glandThymus glandParathyroid glandsPalatine tonsilsMiddle earEustachian tubeUrinary bladderPrimordial germ cellsLining of all organs of digestive tract and respiratory tract During the third week of development, the cephalic (head) and caudal (tail) end of the embryo become distinguishable...

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