Neuron is the structural and functional unit of nervous system. There are two types of processes in the neuron-the dendrite and axon. Dendrite are several short, tapering much branched processes. The dendrites contain neurofibrils, neurotubules, Nissls granules and mitochondria. Axon is single very long cylindrical procesi arises from a conical projection of cyton. The axon contains neurofibrils and neurotubules but lacks Nissls granules. Nodes of Ranvier are parts of axon of myelinated nerve fibres where myelin sheath is absent. Muscle cells are elongated, slender and spindle shaped fibre like cells therefore called muscle fibres. These possess large numbers o: myofibrils formed of actin and myosin.