The human nervous system develops from a small, specialized plate of cells along the back of an embryo. Early in development, the edges of this plate begin to curl up toward each other, creating the neural tube-a narrow sheath that closes to form the brain and spinal cord of the embryo.
What are the four stages of nervous system development?
Neuronal Development
- Embryonic Development: The Beginning.
- Neuronal Development. Stage 1: Neurogenesis. Stage 2: Cell Migration. Stage 3: Differentiation. Stage 4: Outgrowth.
- Neuronal Development in Adults.
- Neuronal Development for Memory and Learning. References.
At what age is the central nervous system fully developed?
The speed of neural processing increases dramatically during infancy and childhood, reaching its maximum at about age 15. Most of this increase is due to the gradual myelination of nerve cell axons (the long “wires” that connect one neuron to another neuron’s dendrites.)
Why is it important for the nervous system to develop first?
The earliest stages of embryonic development are crucial for the formation of the nervous system. They require perfect co-ordination that can be disturbed, especially during the first trimester of pregnancy, if the mother eats poorly, or runs a fever, or takes alcohol or other drugs.
What are the 4 main functions of the nervous system?
The four main functions of the nervous system are:
- Control of body’s internal environment to maintain ‘homeostasis’ An example of this is the regulation of body temperature. …
- Programming of spinal cord reflexes. An example of this is the stretch reflex. …
- Memory and learning. …
- Voluntary control of movement.
What are the five steps in neuron development?
According to this scheme, the essential stages are (1) proliferation of a vast number of undifferentiated brain cells; (2) migration of the cells toward a predetermined location in the brain and the beginning of their differentiation into the specific type of cell appropriate to that location; (3) aggregation of …
What develops first heart or brain?
Just four weeks after conception, the neural tube along your baby’s back is closing. The baby’s brain and spinal cord will develop from the neural tube. The heart and other organs also are starting to form. Structures necessary to the formation of the eyes and ears develop.
What is nervous system and its types?
The nervous system has two main parts: The central nervous system is made up of the brain and spinal cord. The peripheral nervous system is made up of nerves that branch off from the spinal cord and extend to all parts of the body.
Why nervous system is important?
The nervous system helps all the parts of the body to communicate with each other. It also reacts to changes both outside and inside the body. The nervous system uses both electrical and chemical means to send and receive messages.