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The correct choice is the dendrites, which play a crucial role in the functioning of neurons. Dendrites are the branch-like structures that extend from the neuron cell body (soma) and are primarily responsible for receiving incoming signals from other neurons or sensory receptors. They contain numerous receptors that respond to neurotransmitters released by presynaptic neurons, allowing the integration of signals and the transmission of information toward the soma.

This structure is essential for the communication between neurons, as it facilitates the reception of various types of signals, including excitatory and inhibitory inputs. The signals gathered by the dendrites influence the neuron's overall activity and can lead to the generation of an action potential if the cumulative signal exceeds a certain threshold.

In contrast, the axon transmits electrical impulses away from the neuron, while the myelin sheath insulates the axon to enhance signal conduction speed. The soma is the main body of the neuron that contains the nucleus and organelles, but it does not play a direct role in signal reception. The unique morphology and function of dendrites, therefore, make them the primary structures responsible for receiving incoming signals in the neuronal network.