MICROANATOMY

Detailed explanation-1: -A motor unit is made up of a motor neuron and all of the skeletal muscle fibers innervated by the neuron’s axon terminals, including the neuromuscular junctions between the neuron and the fibres. Groups of motor units often work together as a motor pool to coordinate the contractions of a single muscle.

Detailed explanation-2: -motor unit is the term applied to a single motor neuron and all of the muscle fibers that it stimulates.

Detailed explanation-3: -motor unit is a motor neuron plus all the skeletal muscle fibers it stimulates. Motor units are therefore the most basic unit of a skeletal muscle and are what causes a contraction.

Detailed explanation-4: -When a motor neuron is activated, all of the muscle fibers innervated by the motor neuron are stimulated and contract. The activation of one motor neuron will result in a weak but distributed muscle contraction.

Detailed explanation-5: -A tetanic contraction (also called tetanized state, tetanus, or physiologic tetanus, the latter to differentiate from the disease called tetanus) is a sustained muscle contraction evoked when the motor nerve that innervates a skeletal muscle emits action potentials at a very high rate.