Embryology
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| show | Used to characterize embryo development (weeks 2-9). A Carnegie Stage between 1 and 23 is assigned to an embryo based on external features.
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| show | Implantation is complete and planetal circulation begins.
The structure is two layers. Outer layer is embryo and amniotic cavity. The inner layer is the egg yolk.
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| Carnegie Stages 7-9 | show 🗑
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| Dorsal Induction | show 🗑
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| Ectoderm | show 🗑
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| Neural Crest | show 🗑
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| show | Fusion of the neural tube begins in what is to be the cervical region of the spine and begins to spread both caudally and rostrally. The rostral neuropore fuses first, and then the caudal.
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| Carnegie Stage 11 | show 🗑
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| show | Two lateral longitudinal grooves that appear in the walls of the neural tube. They differentiate alar and basal plates. Alar plate derivatives will eventually be associated with sensory processing. Basal plates will be associated with motor processing.
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| show | Rostral differentiation leads to 5 vesicles. Prosencephalon-telencephalon and diencephalon, mesencephalon, and rhombencephalon-metencephalon and myelencephalon.
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| Telencephalon | show 🗑
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| show | Forms the thalamus/hypothalamus.
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| Cephalic Flexure | show 🗑
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| Pontine flexure | show 🗑
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| Stage 13 | show 🗑
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| show | Leads to spinal cord defects.
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| show | The pharyngeal arches emerge at this time.
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| Pharyngeal Arches | show 🗑
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| show | Forms much of the face
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| show | Forms the hyoid bone.
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| show | The telencephalon (cerebral hemispheres), grows rapidly, forming the insula and surrounding it.
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| Ventricular System of the CNS | show 🗑
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| show | Contained in the cerebral hemispheres
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| 3rd ventricle | show 🗑
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| 4th ventricle | show 🗑
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| 5th and 6th months of fetal development | show 🗑
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| show | Babies are born with only rudimentary cerebral connections between hemispheres. Synaptogenesis comes with learned skills.
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