Development from conception to birth
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
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| Embryology | show 🗑
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| show | - fertilization in lateral third of uterine tube
- zygote (fertilized oocyte) moves toward uterus
- cleavage: daughter cells form zygote
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| show | - zygote
- 4 cell
- morula: solid cluster of 12-16 cells
- early blastocyst
- late blastocyst (implantation at this stage)
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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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| Week 2 | show 🗑
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| Primitive streak | show 🗑
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| show | - process of embryo growing from 2-layered disc (epiblast and hypoblast) to three layered disc with 3 germ layers (endoderm, mesoderm, ectoderm) which are all derived from epiblast
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| Week 3: Formation of germ layers | show 🗑
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| Notochord | show 🗑
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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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| show | - ability of one group of cells to influence developmental direction of other cells
- example: notochord signals that stimulate surrounding ectoderm to form brain & spinal cord
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| show | - cranial part becomes the brain, rest becomes the spinal cord
- closure of neural tube begins in week 3 and usually ends by week 4
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| show | - cells originate from ectodermal cells on lateral ridges of neural plate
- forms sensory nerve cells which are positioned just external to closed neural tube
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| Somites | show 🗑
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| show | - area of mesoderm that forms just lateral to neural tube on both sides
- starting cranially and proceeding caudally, divides into series of blocks called somites
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| Intermediate mesoderm | show 🗑
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| Lateral plate | show 🗑
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| show | - becomes serous body cavities for peritoneal, pericardial, pleural cavities
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| show | - embryo folds laterally and head and tail
- primitive gut emerges: site of future digestive and respiratory structures
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| Fetal period | show 🗑
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Created by:
peckman12
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