Vṛṣṇivaṃśa–Anukīrtana (Enumeration of the Vṛṣṇi Lineage) — Questions on Viṣṇu’s Human Descent
मांसात्त मेदसो जन्म मेदसो ऽस्थि निरुच्यते / अस्य्नो मज्जा समभवन्मज्जातः शुक्रसंभवः
māṃsātta medaso janma medaso 'sthi nirucyate / asyno majjā samabhavanmajjātaḥ śukrasaṃbhavaḥ
From māṃsa (flesh) is born medas (fat), and from medas is declared asthi (bone). From bone arises majjā (marrow), and from marrow comes śukra (seed).