Plural of muscle, fleshy body composed of fibers that stretch and contract to allow the different body movements of humans and animals. Some allow voluntary movement in the relationship of the living being with their environment and other involuntary movement of vegetative life as the beating of the heart. The muscles obey orders of the nervous system, the cerebral cortex or the neurovegetative system. The word derives from the latin: mus muris ( 41 mouse; and this from the Greek mys myos with the same meaning and the Latin suffix - culus which means small. The English word mouse ( 41 mouse; It has the same origin.
