Astanga Hrudaya
अवेध्यास्तत्र कार्त्स्नेन देहेऽष्टानवतिस्तथा। सङ्ह्कीर्णा ग्रथिताः क्षुद्रा वक्राः सन्धिषु चाश्रिताः॥३४॥
have been described among these siras (veins) in the body, in total, ninety-eight veins (which should not be cut have been specified) also, (apart from these the siras) which are fused together, formed into lumps, very minute, curved and located inside joints also should not be cut (for bloodletting)
english translation
avedhyAstatra kArtsnena dehe'STAnavatistathA। saGhkIrNA grathitAH kSudrA vakrAH sandhiSu cAzritAH॥34॥
hk transliteration by Sanscript