The difference between Medullated Nerve Fibres and Non-Medullated Nerve Fibres is that in the former the axon is surrounded by a layer of fatty proteinaceous materials called myelin sheath whereas in the latter myelin sheaths are absent.
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Muscular tissue is a contractile tissue, which is speciallised for contraction when excited. It is made up of elongated contractile cells called muscles fibres. The adjacent muscle cells are held together by aerolar tissue.
Polyester fibres are widely used in textile industry for making a variety of textiles such as sarees, dress materials, curtains, etc. They are also blended with natural fibres such as cotton and wool.
Synthetic fibres are made from polymers, many of which are obtained from petroleum. Some common synthetic fibres are nylon, rayon, terylene, acrylon and cashmilon. They can be placed into two groups.