Term
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Definition
| study of the origin and development of single individual |
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Term
| Prenatal period (2 periods) |
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Definition
1. Embryonic period – first 8 weeks
2. Fetal period – remaining 30 weeks |
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Term
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Definition
1. Skin
2. Outer body wall
3. Body cavity and digestive tube
4. Kidneys and gonads
5. Limbs |
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Term
| Derivatives of the three germ layers |
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Definition
1. Ectoderm – forms brain, spinal cord, and epidermis
2. Endoderm
*Forms inner epithelial lining of the gut tube
*Forms respiratory tubes, digestive organs, and urinary bladder
3. Mesoderm – forms muscle, bone, kidneys, gonads, heart, blood vessels, dermis, and connective tissues
*Further differentiated before becoming final organs |
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Term
| Week 5-8 – The Second Month of Embryonic Development |
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Definition
1. Limb buds form
2. Embryo first looks recognizably human
3. Head is disproportionately large
4. All major organs are in place |
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Term
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Definition
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Term
The Fetal Period
A time of ____ and _____ growth
Cells are _____ during the first half of the fetal period
Normal births occur __ weeks after conception
____ birth is one that occurs before __ weeks |
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Definition
The Fetal Period
A time of maturation and rapid growth
Cells are differentiating during the first half of the fetal period
Normal births occur 38 weeks after conception
Premature birth is one that occurs before 38 weeks |
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