Dendrites are typically (= not always) branched cytoplasmic processes that attach to one side of the cell body. They basically contain the same type of cytoplasmic organelles as found in the cell body and perform the same metabolic functions. Dendrites make up most of the receptive zone of a neuron. Embedded in their plasma membranes are receptor molecules that can detect specific types of stimuli (= environmental changes). Most neurons in the CNS have receptors for neurotransmitter molecules released by other neurons. When a stimulus is detected, ions diffuse in and out of the dendritic membranes. This causes weak electro-chemical signals to develop and move towards the cell body.