With reference to the spread and growth of Buddhism, the role of the given heads is explained ahead:
The Buddhist Sangha: Buddha established the Buddhist Sangha to spread his teachings far and wide. The male members were called Bhikshus. Even, women were allowed to join the Sangha as Bhikshunis or nuns. They lived in monasteries, known as Viharas, specially constructed for them. They led a highly disciplined life renouncing all pleasures of the world and engaged in preaching the doctrines of Buddha.