Related by context. Frequent words. (Click for all words.) 70 sensory neurons 69 nerve impulses 69 trigeminal nerve 66 nerve endings 65 vagus nerve 64 nerve fibers 64 peripheral nerves 64 electrical impulses 64 nerve cells 63 cannabinoid receptors 62 skeletal muscles 62 autonomic nervous system 62 thalamus 62 cortex 62 neurones 61 spinal nerves 61 limbic system 60 excitatory 60 midbrain 60 chemical messengers 60 muscle contractions 60 serotonin receptors 60 TRPA1 60 cerebellum 60 signaling molecules 60 sweat glands 60 auditory nerve 60 electrical pulses 60 NMDA receptors 60 neurons 60 lymphatic vessels 59 TRPV1 59 brainstem 59 tubules 59 sebaceous glands 59 salivary glands 59 sensory input 59 cochlea 59 neuron 58 olfactory bulb 58 limbic 58 receptors 58 Neurons 58 neural pathways 58 forebrain 58 hypothalamic 57 neurotransmitters 57 dopamine receptors 57 temporal lobes 57 myocardium 57 astrocyte 57 endocannabinoids 57 hypothalamus 57 neurotransmitter dopamine 57 external stimuli 57 plasma membrane 57 biochemical pathway 57 visual cortex 56 temporal lobe 56 GI tract 56 NKT cells 56 dopamine neurons 56 biochemical pathways 56 capillaries 56 motor neurons 56 basal ganglia 56 neurotransmitter 56 cellular metabolism 56 bronchi 56 dendritic spines 56 glutamate 56 glands 56 brain 56 neural circuits 56 neural 56 inhibitory 56 pulmonary arteries 56 striatum 56 nasal cavity 56 homeostatic 56 optic nerve 56 integrins 56 bronchial tubes 56 skeletal muscle 55 pineal gland 55 auditory cortex 55 brain circuitry 55 neuronal activity 55 axons 55 neural circuitry 55 dentate gyrus 55 epithelium 55 vestibular 55 cortical 55 optic nerves 55 ion channels 55 blood vessels 55 diseased tissues 55 cilia 55 gastrointestinal tract 55 noradrenaline