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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.
Sophia Learning
Sophia: Central and Peripheral Nervous System
Describes the organization and function of the nervous system.
University of Oxford (UK)
Oxford University: The Structure of the Brain
This report is entitled "The Structure of the Brain." Scroll down to section 3.2.3 for more on brain anatomy.