The term "mātikā" (summary, list) seems to have been used first to refer to the bare list of rules in the bhikkhu-pātimokkha and bhikkhuni-pātimokkha. There appear to have been monks and nuns who specialized in memorizing and reciting them. Then there were the detailed explanations and elaborations of those lists, called the sutta-vibhanga ("sutta" also had a somewhat different meaning than what we understand by it today, it meant something like "rule"). Only later on, as the Abhidhamma was gradually developed along similar lines, "mātikā" also refers to the various lists of dhammas enumerated therein.
Bhikkhu GavesakoKiṃkusalagavesī anuttaraṃ santivarapadaṃ pariyesamāno... (MN 26)ajahnchah.org
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