CHĀNDOGYA UPANISHAD · 8.6.6

तद् एष श्लोकः ।
शतं चैका च हृदयस्य नाड्यस् तासां मूर्धानम् अभिनिःसृतैका ।
तयोर्ध्वम् आयन्न् अमृतत्वम् एति विष्वङ्ङ् अन्या उत्क्रमणे भवन्त्य् उत्क्रमणे भवन्ति ॥

tad eṣa ślokaḥ ।
śataṃ caikā ca hṛdayasya nāḍyas tāsāṃ mūrdhānam abhiniḥsṛtaikā ।
tayordhvam āyann amṛtatvam eti viṣvaṅṅ anyā utkramaṇe bhavanty utkramaṇe bhavanti ॥

There is this verse: 'There are a hundred and one arteries of the heart; one of them penetrates the crown of the head; moving upwards by it a man reaches the immortal; the others serve for departing in different directions, yea, in different directions.'

F. Max Müller · The Upanishads, Sacred Books of the East 1 (1879)