Astanga Hrudaya
नाभिशङ्खाधिपापानहृच्चृङ्गाटकवस्तयः । अष्टौ च मातृकाः सद्यो निघ्नन्त्येकान्नविंशतिः ॥ ५२ ॥
Sadyo pranahara marma – vital spots which cause instant death: Nabhi (1), Sankha (2), Adhipati (1), Apana (Guda) (1), hrdaya (1), Srgataka (4), basti (1) and the eight Matrka (8); these nineteen , take away life immediately (hence these are known as sadyahpranahara)
english translation
nAbhizaGkhAdhipApAnahRccRGgATakavastayaH । aSTau ca mAtRkAH sadyo nighnantyekAnnaviMzatiH ॥ 52 ॥
hk transliteration by Sanscript