Questions and Answers
When does the development of the nervous system begin in embryos?
16th or 17th day
The thickening of the ectoderm forms the __________.
neural plate
What forms after the neural grooves?
neural tube
What begins to swell and form the primitive brain by 28 days?
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Nervous tissue is only composed of glial cells.
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Wider and thicker axons conduct impulses __________.
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What are the functions of neuroglia?
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Study Notes
Development of the Nervous System
- Begins on the 16th or 17th day of embryonic development.
- Initial formation starts with a longitudinal band of cell proliferation on the surface of the ectoderm.
- Formation of a neural plate occurs as the band thickens, which then folds inward to create neural grooves.
- By around 22 days, the neural groove deepens and separates, leading to the creation of the neural tube.
- By 28 days, neural structures begin to swell, marking the early formation of the primitive brain.
Composition of Nervous Tissue
- Nervous tissue consists of two main types of cells: neurons and glial cells.
- Impulses generated near the neuron’s cell body travel along the axon.
- The conduction speed of impulses along the axon is influenced by the presence of the myelin sheath; its absence results in slower conduction.
- Axons that are wider and thicker enhance the speed of impulse conduction.
Functions of Neuroglia
- Neuroglia support the functioning of neurons by providing essential nutrition sourced from blood.
- They play a critical role in the removal and absorption of waste materials produced by neurons.
- Neuroglia are responsible for the formation of the myelin sheath, which insulates axons and facilitates faster impulse transmission.
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Description
This quiz covers the development of the central nervous system, focusing on the embryonic stages from the 16th to 28th day. Learn about the formation of the neural plate, neural grooves, and the early structures of the brain. Test your knowledge on the critical stages of nervous tissue development.
