Ayurveda describes the human body as an integrated structural and functional entity governed by Dosha, Dhatu, and Mala. Among the anatomical structures, Sira play a vital role in the sustenance of life by facilitating circulation and nourishment of tissues. Marma are vital points of the body where multiple structures such as Mamsa, Sira, Snayu, Asthi, and Sandhi converge, making them critically important from both anatomical and clinical perspectives. Ashtanga Hridaya elaborately explains the intimate relationship between Sira and Marma, emphasizing that most Marma are Sira-ashrita, and injury to these sites leads to severe consequences. The present article aims to critically review the concept of Sira in relation to Marma-Vastu based on classical references from Ashtanga Hridaya, highlighting their anatomical significance, functional relevance, and clinical implications.