any of several elongated, threadlike cells (especially a muscle fiber or a nerve fiber)

a slender and greatly elongated substance capable of being spun into yarn

thin membranous sheath around a nerve fiber

any bundle of nerve fibers running to various organs and tissues of the body

a nerve fiber encased in a sheath of myelin

a nerve fiber that terminates on a muscle or gland and stimulates contraction or secretion

long nerve fiber that conducts away from the cell body of the neuron

short fiber that conducts toward the cell body of the neuron

a nerve fiber that carries impulses toward the muscles or glands

thin membranous sheath around a nerve fiber

any bundle of nerve fibers running to various organs and tissues of the body