20. Ajjhatta Tika:
(i) (1050). What are the dhamma which are internal?
There are: Corporeality, Sensation, Perception, Volitional Activities and Consciousness which arise in various beings by attachment to one's own self, which arise by attachment to each individual self, which arise in one's own body, which are the property of each individual, and which arise by attachment to one's own body.
~These are the dhamma which are internal.
Leaving aside Corporeality which does not have any faculties and Nibbana, all the remaining dhamma are the dhamma which sometimes arise internally, which sometimes arise externally and which sometimes arise both internally and externally.
Corporeality which does not have any faculties and Nibbana are the dhamma which arise externally