This paper intends to clarify a concept with multiple meanings and a complex reality. It starts providing varied histological and embryological examples apt to contribute the stimulation of teacher and student imaginations in favor of a crucial skill, as thematic integration is, into the present and changing curricula in Medicine in particular and Health Sciences in general. In this sense, it offers linear and branched sequences as well as consolidation graphics which focusing in both disciplines may also include other basic ones, key for clinic diagnosis, among the competences to be developed. After registering some preliminary results revealing the need of its continuous and progressive training along the complete medical career, its own integrative value and the integrative one for their teachers due to its natural link with other basic ones is outlined, its relevance for undergraduate is reaffirmed and possible future variations for them are previewed, considering the present exponential growth of science and technology.