1. Muscle Innervation
Skeletal muscles are acted upon by somatic motor neurons (neurons that take thought)
Motor unit: axon terminal branches of the neuron and the muscle fibers that they act on
Motor units can be small or large depending on type of movement, gross, fine

2. Neuromuscular Junction
Synapse: the connection between nerve and target cell (neuromuscular junction)
Synaptic knob: end of neuron that rests next to muscle fiber
Synaptic cleft: the gap between the knob and muscle fiber
Acetylcholine (ACh): A chemical produced by neuron, acts as neurotransmitter

3. Neuromuscular Junction
Synaptic vesicles: organelle sacks that store ACh
ACh receptors: bind to ACh
Basal lamina: a thin layer of collagen and proteins at cover fiber and fills synaptic cleft
Acetylcholinesterase (AChE): produced by lamina in cleft. Brakes down ACh so muscles can relax