Category: N

Neurotransmitter

Neurotransmitter

Although nerve impulses are electrical, the transmission of these impulses from one neuron (nerve cell) to another, or to a muscle cell, is achieved chemically rather than electrically. The chemical that transmits the message is a neurotransmitter. Scores of different chemicals...

Neuropathy

Neuropathy

Neuropathy: Disease, inflammation, or damage to the peripheral nerves, which connect the central nervous system, or CNS (brain and spinal cord), to the sense organs, muscles, glands, and internal organs. Symptoms caused by neuropathies include numbness, tingling, pain, or muscle weakness, depending...

neuron

Neuron

Neuron: A nerve cell. There are billions of neurons in the nervous system; they act in various combinations to do everything from writing a symphony to scratching a fleabite. The neurons are analogous to the wires in a complex electrical...

Neuroblastoma

Neuroblastoma

Neuroblastoma: A tumor of the adrenal glands or sympathetic nervous system (the part of the nervous system responsible for certain automatic body functions, notably the fight or flight response). Most neuroblastomas develop in the adrenal glands or in the sympathetic nerves...