Muscle Innervation Skeletal muscles are acted upon by somatic motor neurons (neurons that take thought) Motor unit: axon terminal branches of the neuron.

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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

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

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