Astanga Hrudaya
तलहृन्नाम रुजया तत्र विद्धस्य पञ्चता। अङ्गुष्ठाङ्गुलिमध्यस्थं क्षिप्रमाक्षेपमारणम्॥३॥
talahrdaya, injury to this will lead to death from (severe) pain. In between the big toe and the first toe, is a vital spot known as ksipra, injury to this causes convulsions leading to death.
english translation
talahRnnAma rujayA tatra viddhasya paJcatA। aGguSThAGgulimadhyasthaM kSipramAkSepamAraNam॥3॥
hk transliteration by Sanscript