[Details about purusha] Purusha comprises of six dhatu (elements), viz. five mahabhuta (in their subtle form) and consciousness. The element of consciousness alone could also be considered purusha.
According to another classification, Purusha comprises of twenty four dhatu, i.e. mana (mind), ten indriya (sensory and motor organs), five objects of sense organs and prakriti (consisting of eight dhatu, viz. five mahabhuta (in their subtle form), ahamkara (ego), mahat (intellect) and avyakta (primordial element)
[Description of Manas (mind)] Sometimes one understands a thing and sometimes one does not. This proves the existence of the mind as a separate sense organ. That is why, when there is no contact of the mind with sense organs and their objects, no understanding of things can occur.
It is only when the required mental contact is there that one can understand things. Atomicity and oneness are considered to be the two characteristic qualities of the mind.