Ācāra-vidhi (Rules of Conduct) — Yudhiṣṭhira’s Inquiry and Bhīṣma’s Normative Catalogue
संधिष्वपि च सर्वेषु संनिविष्टस्तथानिल: । शरीरेषु मनुष्याणां व्यान इत्युपदिश्यते,जो मनुष्योंके शरीरोंमें और उनकी समस्त संधियोंमें भी व्याप्त है, उस वायुको “व्यान' कहते हैं
sandhiṣv api ca sarveṣu sanniviṣṭas tathānilaḥ | śarīreṣu manuṣyāṇāṃ vyāna ity upadiśyate ||
Bharadvāja said: The vital wind that is present throughout all the joints and pervades the bodies of human beings is taught to be called Vyāna. In this teaching on the inner constitution of life, the name ‘Vyāna’ marks the all-pervading force that circulates and sustains bodily integration, showing how dharma also rests on understanding the ordered functioning of one’s own being.
भरद्वाज उवाच
The verse defines Vyāna as the vital wind that pervades the entire human body, including all the joints, emphasizing an all-spreading life-force that supports bodily cohesion and circulation.
In Śānti Parva’s instructional discourse, Bharadvāja is explaining the functions and names of the internal vital airs (vāyus/prāṇas), identifying which one is called Vyāna by its characteristic pervasion through the body and joints.