Which part of the neuron contains the nucleus?

The cell body, also known as the soma, is the part of the neuron that contains the nucleus. The nucleus houses the cell's genetic material and is responsible for regulating the activities of the neuron, including gene expression and the maintenance of cellular functions. The cell body integrates signals received from the dendrites and, if a sufficient signal is received, generates an action potential that travels down the axon to communicate with other neurons or muscle cells.

In contrast, the axon is primarily responsible for transmitting impulses away from the cell body, while dendrites receive incoming signals from other neurons. The myelin sheath, which is a protective covering that surrounds the axon, aids in faster signal transmission but does not contain the nucleus. Therefore, the cell body is the correct answer, as it is the only part of the neuron that contains the nucleus.