Development from conception to birth
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| show | - study of origin and development of single individual
- embryonic period: first 8 weeks
- fetal week: 9 weeks to birth
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| Week 1 | show 🗑
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| Stages of week 1 development | show 🗑
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| show | - fluid filled structure of about 60 cells
- inner cell mass: forms embryo
- trophoblast: helps form placenta
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| show | - 2 layered embryo
- bilaminar embryonic disc: inner cell mass divided into 2 sheets (epiblast and hypoblast)
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| Primitive streak | show 🗑
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| Gastrulation | show 🗑
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| Week 3: Formation of germ layers | show 🗑
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| show | - day 16: made of mostly mesoderm and some endoderm
- defines body axis and forms midline that divides left & right sides of body
- future site of vertebral column
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| show | - neural plate: ectoderm in dorsal midline thickens to form neural plate
- neural groove: ectoderm of neural plate folds inward until hollow neural tube is pinched off into body
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| Induction | show 🗑
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| Neural tube | show 🗑
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| Neural crest | show 🗑
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| Somites | show 🗑
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| Paraxial mesoderm | show 🗑
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| show | - begins as continuous strip of tissue just lateral to paraxial mesoderm
- each segment is attached to a somite
- influenced by segmentation of somites
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| show | - most lateral part of mesoderm
- splits into 2 layers that have a wedge between them (coelom)
- somatic mesoderm: next to ectoderm
- splanchnic mesoderm: next to endoderm
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| Coelom | show 🗑
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| Week 4 | show 🗑
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| show | - week 9 to birth
- has been sexual differentiation of genitalia
- organ systems established in embryonic period continue to grow and differentiate
- period of rapid growth
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Created by:
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