There are four Vedas known to Hindusism, which concerned with different knowledge or known for their specialised informations regarding their subjects. They are also known as the oldest document or scripture mainly written by Acharya Veda Vyasa. Even that some of the scholars considers it as unhuman work which says that the Vedas are self generated scriptures. These are 4 in numbers i.e. Riga veda, Yajurveda, Samaveda & Atharvaveda.
It is the oldest among the other vedas, comprises of 1057 mantras which mainly informed about the deities descriptions and their prayer rituals. (Dhanurveda is the Upaveda)
It is divoided into 2 parts of Krishna Yajurveda & Shukla Yajurveda, which collectively consist of 1975 mantras about the Kriya & yajnas. (Sthapatyaveda is the Upaveda)
It formed from 1875 mantras and it deals with the knowledge of Gana (melodies) fundamentally for the upasanas of God. (Gandharvaveda is the Upaveda)
This is the last veda part constituted with the knowledge of vedic culture, customs, beliefs, marriage & cremation. With highest numbers of mantras i.e. 5977. (Ayurveda is the Upaveda)
Samhita (mantras & benedictions)
Aranayakas (rituals & sacrifices)
Brahamanas (rituals commentaries)
Upanishadas (medtation, philosophy, spiritual knowledge)
In these four vedas the knowledge of Ayurveda present in scattered form but largely present in Atharvaveda. Some of the scholars also consider Ayurveda as the Panchama veda (the fifth veda). So the knowledge of Ayurveda comes with the origin of mankind.
