Neurons communicate with each other through specialized junctions called synapses, where electrical and chemical signals are transmitted from one neuron to another. This communication forms the basis of all nervous system functions, including sensation, movement, learning, memory, and regulation of body functions. The process involves the generation of electrical impulses, release of neurotransmitters, and activation of receptors on the receiving neuron. A neuron consists of three main parts: the cell body (soma), dendrites, and the axon. Dendrites receive incoming signals from other neurons, the cell body integrates these signals, and the axon carries the nerve impulse away from the cell body toward the synaptic terminal. The axon may be covered with a myelin sheath, which increases the speed of impulse conduction by allowing the action potential to jump from one node of Ranvier to another, a process known as saltatory conduction. Communication begins when a neuron receives sufficient excitatory input to reach a threshold potential. Once the threshold is achieved, voltage-gated sodium channels open, allowing sodium ions to enter the neuron. This causes rapid depolarization, generating an action potential. The action potential travels along the axon without losing its strength due to the all-or-none principle. After depolarization, potassium channels open, allowing potassium ions to leave the cell, restoring the resting membrane potential through repolarization. The sodium-potassium pump helps maintain the ionic balance required for future action potentials. Most neuronal communication occurs through chemical synapses. A synapse consists of the