Explain the structure of neuron or Nerve cell.
Answers
A neuron is a structural & functional unit of a nervous system which transmits, receives & conducts the impulses.
It is having a length = 90 - 100 cm
It is devided into 3 categories :-
Cell body :- It consists of central nucleus, cytoplasm & various cell organelles. They are also known as neuro plasm. They help in growth & metabolism activities of neurons.
Dendrites :- The fine & small protoplasmic process of cell body.
It consist of Nissl Granule & neurofibrils.
It help in electrical, mechanical, physical & chemical sensations by intake & transfer to cell body.
Axon :- It is branched terminally .
It carries impulses away from cell body. The branches are known as telodendria. It is covered with nerve fibre. It is a long process .
A single axon develop a cell body. It consists of neuro lemma.
Nissl granules are absent. Neuro fibrils are preset.
Nerve ending :-
Axon terminals are also known as nerve endings .
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