Astanga Hrudaya
आशयच्चादनौ तौ तु नितम्बौ तरुणास्थिगौ। अधःशरीरे शोफोऽत्र दौर्बल्यं मरणं ततः॥२१॥
the two areas above the ear-like projections of the pelvis (outside the buttocks), concealing the visceral organs and composed of delicate cartilages are two nitamba (marmas); injury to these leads to swelling and debility in the lower portion of the body and death.
english translation
AzayaccAdanau tau tu nitambau taruNAsthigau। adhaHzarIre zopho'tra daurbalyaM maraNaM tataH॥21॥
hk transliteration by Sanscript