In humans, the pulivnar refers to the posterior portion of the thalamus. The pulvinar is the largest structure of the thalamus (Watson & Breedlove, 2018), and has been shown to have a crucial role in the direction of attention and visual processing.
Watson, N., & Breedlove, M. (2018). The Mind’s Machine—Foundations of Brain and Behavior. Oxford, England: Oxford University Press.