Images of books of four Vedas and a page of veda. Physiological concepts of Tridosha, five divisions of Vayu, or its twin forms are also mentioned in the Vedas, as "Ye Tri-saptah' (in Atharvaveda), "Prnaya Swana apanaya Swaha" etc. (in Yajurveda). Various body organs like Shroni (pelvis), Asthi (spine), Kikasa (vertebra), and "Sushumna" (spinal cord), which is 101 nadis helping Udana Vayu moves from feet to the head has been referred. The holistic view of this medical system i.e. prayers offered to God or samarpana to God along with Karma Kanda, Yagga Anusthans for recovery was well described. Atharveda is supposed to be an encyclopedia of medicine for various aspects and specialty, where more clear references of Vata-vyadhi disorders, use of medicinal herbs, and therapies for treatment in a systematic and detailed manner, have been found. The description of Vata kopa and their nidan or shaman has been described in Garuda Purana and Agni Purana. [C] Samhita Period : (400 BC -5th century AD) Samhita period is assumed to be the golden period of Ayurveda. The perfect development of Ayurveda was seen during this period. Two popular Samhitas namely, Charak Samhita, Sushruta Samhita along with other Samhitas namely Sharngadhara Samhita, Bhava Prakasha, Madhava Nidanam, Ashtanga Hridayam, and Ashtanga Sangraha were originated from three sampradayas of Ayurveda i.e. Atreya, Dhanwantari, and Kashyapa Sampraday respectively, during this period. In this kala, several Acharya's contributed a special role in the development of Ayurveda. The Sushruta Samhita, written by the "father of surgery" Sushruta deals with the field of Ayurvedic