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Topic 2- Prenatal development
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- 1pre-embryonic stagefertilisation of ovum by sperm to form a zygote, from day 0 to day 14
- 2embryonic stageonce zygote implants in uterus it becomes an embryo, from day 15 to end of 8th week
-all tissues/organs formed
-cell proliferation
-cell migration
-cell differentiation - 3fetal statefrom 8th week until birth
ØNeurogenesis
Ø Major regions of brain develop
Ø Sulci & gyri, ventricles, CSF
Ø Eyes sensitive to light, reacts to sound
• Weeks 25- birth
Ø Size increases, lungs mature
Ø Some reflexes emerge 28 weeks
Rapid brain development - 43 layers of the embryonic disk• Endoderm: gut, liver, pancreasand respiratory system
• Mesoderm- muscles, skeleton, excretory and circulatory systems
Ectoderm-sensory organs, hair, skin, nails and whole nervous system - 5formation of the neural tube and importance in child development-
- 6Define teratogens, provide examples of teratogens and their potential impact on child development.Teratogens- Substances or conditions that can disturb development of an embryo/fetus
e.g. medication, alcohol, drugs, maternal disorders.
Impact- can lead to prematurity, fetal alcohol syndrome, or other conditions - 7Explain the potential impact of teratogens during each stage of prenatal development and in relation to the sensitive period.-
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- Descripción
- • To describe the typical sequence of prenatal development in relation to nervous system development • To explain the potential impact of teratogens and premature birth on development • To compare the nervous system development that is complete at birth and that which is still developing • To describe infant behavioural states and their relevance to neonatal screening
- Creado por
- Bonnie McDonald
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- 17
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