Which structure in the nervous system deteriorates in an individual with multiple sclerosis, leading to muscle weakness and uncoordinated movements?

Synaptic vesicles are responsible for storing neurotransmitters that facilitate communication between neurons at synapses. While they play a critical role in neurotransmission, their function is not directly affected in multiple sclerosis. The primary issue in MS lies within the myelin sheath, not the vesicles involved in synaptic transmission.

Axon terminals are the endings of axons where neurotransmitters are released to propagate signals to other neurons. Although they are vital for neuron communication, they do not deteriorate in multiple sclerosis. The disease primarily affects the myelin sheath, not the structural integrity of axon terminals themselves.

Dendrites are the branched extensions of neurons that receive signals from other cells. They remain intact in multiple sclerosis, as the disease primarily targets the myelin sheath rather than the dendritic structure. Thus, while they are essential for receiving signals, their condition does not deteriorate in this context.