Motor neurons transmit signals to muscles and glands throughout the body. There are two major types: the somatic motor neurons that control voluntary muscle movements and the autonomic motor neurons that control involunt... More » Science Human Anatomy Nerves

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 respo... More » Science Chemistry Atoms & Molecules

A motor neuron stimulates a muscle fiber by firing a nerve impulse, which causes the muscle fiber to contract. Cardiac and smooth muscles contract without nervous stimulation, while skeletal muscles require excitation by... More » Science Human Anatomy
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Afferent neurons carry signals to the brain and spinal cord as sensory data, and efferent neurons send signals from the brain to the muscles, glands and organs of the body in response to sensory input. More » Science Human Anatomy Nerves

Though there are over 10,000 specific types of neurons, the three general classifications are sensory neurons, motor neurons and interneurons. Sensory neurons send signals from outside the body into the central nervous s... More » Science Human Anatomy Nerves

The peripheral nervous system consists of the sensory and motor neurons. Sensory neurons are nerve cells that run from receptor cells in the body to the spinal cord; motor neurons travel from the spinal cord to the effec... More » Science Human Anatomy Nerves

A fluid flows around the vestibular system, the section of the inner ear involved with balance, impinging on specialized sensory cells and generating signals that are used by the brain to determine the body's orientation... More » Science Human Anatomy Nerves