Organisation of nervous system, Biology

Organisation of Nervous System

Nervous systems are composed of nerve cells or neurons and glial cells. In the latter half of the 19th century it was strongly believed that nervous systems are composed of complex, continuous mesh-works of cells and processes in protoplasmic continuity along with each other. This theory was termed as the reticular theory and it was strongly supported by Golgi's School. Though, during early 20th century this theory was slowly superseded by the neuron doctrine. The champion of the neuron doctrine was Cajal, who illustrated convincingly that neurons do not physically join or continue with one other but are closely apposed at synapses. The debate on continuity versus contiguity persisted till 1950s, when electron microscopy allowed resolution of cell membranes at neuronal endings, thereby illustrating discontinuity of neurons. The neuron doctrine is the cornerstone of our understanding of nervous system. As per to this doctrine, neurons are discrete cells forming the basic units of the nervous systems.

Posted Date: 2/4/2013 6:16:20 AM | Location : United States







Related Discussions:- Organisation of nervous system, Assignment Help, Ask Question on Organisation of nervous system, Get Answer, Expert's Help, Organisation of nervous system Discussions

Write discussion on Organisation of nervous system
Your posts are moderated
Related Questions
Effect of Metamorphic Hormones on Gene Expression Effect of metamorphic hormones on gene expression in moulting and metamorphosing insects, the first report of a particular ho

Q. What are carbohydrates? Carbohydrates are important organic compounds widely distributed in animals and plants. Plants can synthesize carbohydrates by the process of photos

Cell theory is a theory that asserts that the cell is the ingredient unit of the living beings. Before the discovery of the cell, it was not examined that the living beings were

DERMIS (CORIUM) - Mesodermal in origin. More developed part. Leather is obtained from dermis by tanning. Thinnest in eye lid. Connective tissue present. In it 4 types

How plants control the opening and the closing of the stomata? The closing and the opening of the stomata depend upon the necessity of the plant to lose water and heat through

Q. Explain about Individual consciousness? The physical brain is not a source of experience as some current neuroscientists now mistakenly believe. While areas of the brain are

when does it started?

CAR E OF EYES - 1.       Eyes should be periodically examined in children. 2.       While reading the paper should be held 36 cm. away from eyes and preferable at an angle


Q. Concerning their permeability how are membranes classified? Membranes can be classified as permeable, impermeable, selectively permeable or semipermeable. An impermeable