Glossary of Physio Psych Chapter 5
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- At what age does the CNS begin to develop in the embryo?
- 2 weeks.
- What CNS structures begin to form in the 2 week embryo?
- A neural tube forms around a fluid-filled cavity. This structure then sinks under the skin and develops into the 3 brain parts - mid-, hind-, and fore-brain.
- What does the brain weigh at birth?
- 350 grams
- What does the brain weigh at age one?
- 1000 grams
- What does the brain weigh as an adult?
- 1200-1400 grams
- At what age does the hippocampus fully develop?
- Age 3.
- What are the five steps of neuron development?
- 1. Proliferation.
- What happens during proliferation?
- Cells replicate. This is not always good - they produce protocells as well. This is where cells decide whether to become neurons or glia.
- What happens during migration?
- Most cells form near the ventricles, then move to their appropriate locations.
- What happens during differentation?
- The axon forms, then the dendrite.
- What happens during myelination?
- Myelin forms in the spine, and then in the brain.
- What happens during synaptogenesis?
- Synapses form. This is the last thing to develop.
- When does the immune system begin to develop in fetuses?
- Once the limbs form.
- What are the two main environmental problems for developing babies?
- 1. Fetal Alcohol Syndrome.
2. Cigarette smoking.
- What are the symptoms of Fetal Alcohol Syndrome?
- Hyperactivity, facial abnormalities, retardation, heart defects.
- What are the symptoms of Cigarette smoking?
- Low birth weight, early illnesses. SIDS, Long-term intellectual deficits, ADHD, and impairment of the immune system.
- How plastic is the brain after damage?
- It depends on how the damage occurred.
- What is a closed head injury?
- Rotational force that slams the tissue against the inside of the skull. This is the most common source of head injury in the young, like shaken baby syndrome.
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