In post natal period the greatest growth in the CNS is of?
Correct Answer: Dendrite
Description: Ref: Yoshihara, Y., De Roo, M. & Muller, I). Dendritic spine formation ami stabilization. Cure Opin Neurobiol (2009).Explanation:"It was commonly admitted that dendritic spines were formed during embryonic development and then would remain stable after birth. New techniques of confocal microscopy demonstrated that dendritic spines are indeed motile and dynamic structures that undergo a constant turnover, even after birthPost natal growth of CNSThough almost all neurons are present at birth, the brain continues to grow for a few years after birth.Though it was believed that neurons do not grow after birth, the CNS growth was attributed to Glial cells.Glial cells continue to divide and multiply even after birth.Glia carries out many important functions for normal brain function including insulating nerve cells with myelin. The neurons in the brain also make many new connections after birth.But recently, there are evidences to show that even Neuron grow and develop after birth.The component of neuron associated with growth is Dendritic spinesParts of NeuronMost neurons have three main parts:DendritesPerikarya (cell bodies)AxonThe dendrites are receptive to stimuli and bring stimuli from the environment (sensory epithelial cells or other neurons) to the cell body.There are usually several dendrites per neuron.The perikaryon (cell body) is also receptive to stimuli, but also serves as the trophic or synthesizing center for the whole nerve.The axon is a long process emerging from the cell body.There is only a single axon for each neuron.The axon transmits impulses to other neurons, or to effectors: muscle or gland cells.The distal portion of the axon is usually branched (terminal arborization).
Category:
Physiology
Get More
Subject Mock Tests
Practice with over 200,000 questions from various medical subjects and improve your knowledge.
Attempt a mock test nowMock Exam
Take an exam with 100 random questions selected from all subjects to test your knowledge.
Coming SoonGet More
Subject Mock Tests
Try practicing mock tests with over 200,000 questions from various medical subjects.
Attempt a mock test now