cheek, face, steel, brass, spunk, heart, boldness, mettle, effrontery, nervus, more...

timidity, cowardice, fearfulness, hesitation, meekness

sensory nerve, motor nerve, mixed nerve, cranial nerve, spinal nerve, autonomic nerve, peripheral nerve, somatic nerve, sympathetic nerve, more...

optic, facial, sciatic, median, cranial, vagus, trigeminal, auditory, peripheral, laryngeal, radial

have the guts,   impulse transmitter,   the gall,   utter gall,   the audacity,   has the gaul,   had the guts,   had the gall,   have the gall,   gall to ask