axon, 5.5 um, 150 um (one-end close, 2615) soma, 20 um, 45 um (cylinder, both ends open, 2827) microvilli, 20 um, 20 um (cylinder, one-end close), neck, 10 um, 10 um (serial conductance only) terminal, 10 um, 30 um conductances Dr 0.95 Ia 2 Ikca 0.05 Ir 0 / 0.68 Na 10 Ca 0.005 Cat 0.001 leak 0.0005