vagus nerve, parasympathetic, meditation, woman, medically

vagus nerve parasympathetic meditation woman medically illustration brain yoga autonomic nervous system ganglion stress relaxation spinal cord stem stomach pain digestive human organs heart lungs liver tract colon kidney spleen pneumogastric digestion anatomy anatomical biology body braches plexus neurology neural health care relax 3d diagram longest blue black cranial ans glow vector showing meditaion