This chapter discusses various aspects of nervous tissue, a tissue that has the special property of being able to conduct impulses rapidly from one part of the body to another. The specialized cells that constitute the functional units of the nervous system are called neurons. Elementary structure of a neuron, classification of synapses, peripheral nerves, incisures of Schmidt lanterman, degeneration and regeneration of neurons, and exteroceptive receptors, are some topics discussed in detail. Ruffini endings are slow adapting cutaneous mechanoreceptors responsive to stresses in dermal collagen and resemble the Golgi tendon organs. Muscle spindles provide information to the CNS about the extent and rate of changes in length of muscle. On reaching a muscle fiber some axon terminals divide into a number of small ramifications each ending in an expansion applied to the surface of the muscle fiber. These are referred to as en grappe endings. Autonomic ganglia are concerned with the nerve supply of smooth muscle or of glands. The pathway for this supply always consists of two neurons: preganglionic and postganglionic.