Vaishnava Dharmashastra 96.89

96.89

nābhirājo gudaṃ śukraṃ śoṇitaṃ śaṅkhakau mūrdhā kaṇṭho hṛdayaṃ ceti prāṇāyatanāṇi ||

Of (atoms of) hairs (of the body), there are fifty-four Kotis (or five hundred and forty millions) and sixty-seven Lakshas (making in all five hundred and forty-six millions and seven hundred thousand).
89. The navel, the principle of vital action (which dwells in the heart), the anus, semen, blood, the temples, the head, the throat, and the heart are the seats of the vital airs.