Madhvaon Brahma Sūtra 2.4.17

The Chief Prana being excepted, they only (the remaining twelve breaths are the organs; for the Pautra- yana Sruti says, “ Only twelve are said to be the organs, but the chief Prana is not an organ. For the Chief Prana is the absolute master and guide of the organs that run towards (their) objects.” And in the Brihat Samhita the same is said; “ The ear and other senses (five) speech and other organs (five) together with Mind and Thought, all form only twelve organs. They are called Indria (or senses,) because they pass on to the object; and the all-powerful Prana, standing on from his own place, is guiding all (the senses and organs).