Related by context. Frequent words. (Click for all words.) 60 cilia 59 nerve cells 58 cortex 57 electrical impulses 57 nerve fibers 57 ear canal 57 nerve impulses 56 neurons 56 brainstem 56 cerebellum 55 visual cortex 53 photoreceptors 53 neurones 53 electrodes 53 nasal cavity 53 nerve endings 52 inner ear 52 neuron 52 cerebral cortex 52 Neurons 52 auditory 52 motor neurons 52 hair follicles 52 axons 51 resonator 51 gastrointestinal tract 51 epithelial cells 51 hypothalamus 50 circuitry 50 synapses 50 hair follicle 50 ion channels 50 synapse 50 optic nerve 50 fibroblasts 50 temporal lobe 50 waveguide 50 thalamus 49 vasculature 49 cortical 49 dendrites 49 blood vessels 49 testes 49 epithelium 48 vagus nerve 48 eardrum 48 diaphragm 48 sweat glands 48 electrical pulses 48 hippocampus 48 intestinal tract 48 axon 48 germ cells 48 testis 47 electrode 47 brain circuitry 47 vocalizations 47 digestive tract 47 brain 47 salivary glands 47 nanotube 47 fatty tissue 47 GI tract 47 signaling molecules 46 adrenal gland 46 nanowire 46 retina 46 electrical currents 46 dermis 46 neural 46 tinnitus 46 striatum 46 ventricles 46 synaptic 46 cells 46 neurotransmitter 46 magnetic fields 46 mitochondria 46 melanocytes 46 signaling pathway 46 neurotransmitters 46 frontal lobes 46 small intestine 45 cell membrane 45 photons 45 receptors 45 molecules 45 microtubules 45 modulate 45 frontal lobe 45 electromagnetic waves 45 muscle tissue 45 capillaries 45 skeletal muscle 45 pancreas 45 follicles 45 membranes 45 nanowires 45 membrane 45 neuronal 45 mammalian