Bartleby
Bartleby.com: The Fore Brain or Prosencephalon
This site from Bartleby.com contains an intense, in-depth article from Henry Gray's Anatomy of the Human Body on the fore-brain or prosencephalon. The article discusses the thalamus throughout and touches on its functions as a whole.
OpenStax
Open Stax: Anatomy & Physiology: The Central Nervous System
Students study the adult brain, and learn the connections between the cerebrum and brain stem through the diencephalon, and from those regions into the spinal cord.