Where does the consciousness (cittas) originate inside the body? I have heard that all consciousness arise in hadaya vatthu rupa (blood inside the heart) except the five doors perceiving consciousness (Cakku vinnana, Sota vinnana, Ghana vinnana, Jeevha vinnana, Kaya vinnana).

There are some research articles on the internet about the impact on the heart due to brain damage. So one can argue that the brain is merely an organ which supports the functionality of other organs and hadaya vatthu rupa is the place where consciousness originate. Another one can argue the other way around.

So my questions are:    


Where does the consciousness (cittas) originate inside the body? Is it in the brain or hadaya vatthu rupa?
Consciousness is nāma (not material/formless). Then how can we talk about a place of origination of it?
Space is a derived quality of matter, so consciousness cannot be said to take up or exist in space. To say that the mind arises here or there is not really proper in an ultimate sense. Consciousness can arise based on physical entities, and hadaya vatthu is the base for both the mind element and mind consciousness element. This doesn't mean that consciousness arises in the hadaya vatthu.


  According to the Pali commentators, the heart serves as the physical support for all cittas other than the two sets of fivefold sense consciousness, which take their respective sensitivities
  as their bases. In the canonical Abhidhamma the heart-base is not expressly mentioned. The Patthāna, the last book of the Abhidhamma Pitaka, simply speaks of “that matter in dependence on which the mind element and mind-consciousness element occur”. The Commentaries, however, subsequently specify “that matter” to be the heart-base, a cavity situated within the physical heart. (Comprehensive Manual of Abhidhamma 144–5 , Bodhi et al)