The law of agency is an area of commercial law dealing with a contractual or quasi-contractual, or non-contractual set of relationships when an agent is authorized to act on behalf of another (called the Principal) to create a legal relationship with a Third Party.
Upper Motor Neurones (UMN), Lower Motor Neurone (LMN) and their Lesions. All the neurons contributing to the pyramidal and extrapyramidal systems should be called upper motor neurons (UMN). The anterior horn cells and the related neurons in the motor nuclei of some cranial nerves are called lower motor neurons (LMN). Axons of these cells give rise to the peripheral motor nerves.
Upper motor neurons release a neurotransmitter, acetylcholine, from their axon terminal knobs, which are received by nicotinic receptors of the alpha motor neurons. In turn, alpha motor neurons relay the stimulus. From there, acetylcholine is released from the axon terminal knobs of alpha motor neurons and received by postsynaptic receptors (Nicotinic acetylcholine receptors) of muscles, thereby relaying the stimulus to contract muscle fibers.