This concept groups the vertebrate brain oxytocin system as an evolutionary pathway-level topic. In the abstract it includes hypothalamic organization, release modes, and forebrain projections.
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oxytocin pathways
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The review summarizes effects of oxytocin and its homologs on pro-social reproductive behaviors across vertebrate representatives and proposes anatomically plausible release pathways contributing to these behaviors in basal vertebrates and amniots.
In basal vertebrates, magnocellular neurons producing oxytocin homologs are organized in a single hypothalamic preoptic nucleus, whereas in amniotes this organization diverged into paraventricular and supraoptic nuclei with accessory nuclei.
Evolutionary microanatomical and cytological changes in the oxytocin system were associated with a shift from ancient cerebrospinal-fluid release toward vascular release.
A major progressive transformation of the vertebrate oxytocin system was the expansion of oxytocin axonal projections to forebrain regions.