There are five forms of prāṇa, all having different names according to the bodily functions with which they correspond. These forms of prāṇa are: udāna-vāyu, corresponding to the throat region and the function of speech prāṇa-vāyu, corresponding to the chest region samāna-vāyu, corresponding to the central region of the body and the function of digestion apāna-vāyu, corresponding to the region of the lower abdomen and the function of elimination vyāna-vāyu, corresponding to the distribution of energy into all areas of the body
