Know that there are ten principle canals. These help the functions of the five senses. From those ten issue out thousands of other passages that are minuter in form.
दश विद्याद् धमन्योऽत्र पञ्चेन्द्रियगुणावहाः। याभिः सूक्ष्माः प्रतायन्ते धमन्योऽन्याः सहस्रशः॥