Quick Answer. The function of motor neurons is to release the neurotransmitter acetylcholine, which are released at a junction known as the neuromuscular junction, that bind to postsynaptic receptors, causing the muscle fiber to respond and result into a muscle movement.
The critical element that culturally sets humans apart from other species is the functional superiority of the human brain. That existing human culture has three axial components, namely politics, religion, and technology, which influence the affairs of mankind, must be obvious to all with a passing interest in human behaviour.
A Discovery Health answered. The cerebral cortex is what separates human beings from other species. It regulates language and intelligence and gives us the ability to form ideas and express them. This gives us an advantage over other species that may have larger brains than we have.