Neuromuscular junctions

The neuromuscular junction (NMJ) is the synapse between a motor neuron axon terminal and a skeletal muscle fiber. It is not a cell type but a structure. The axon terminal releases acetylcholine (ACh), which binds to nicotinic ACh receptors on the muscle cell's motor end plate, triggering an action potential and muscle contraction. Schwann cells (terminal/perisynaptic) cover the axon terminal.