Who was the first to discover the human brain

Rufus of Ephesus

Explanation:

By the first century A. D., Alexandrian anatomists such as Rufus of Ephesus had provided a general physical description of the brain.  Basic structures such as the pia mater and dura mater (the soft and hard layers encasing the brain) were identified in addition to the basic divisions of the brain itself. Building upon this research in the next century, the Roman physician Galen concluded that mental actively occurred in the brain rather than the heart, as Aristotle had suggested.  His observations of the effects of brain injuries on mental activity formed an important practical basis for his conclusions.  Galen concluded that the brain was the seat of the animal soul -- one of three "souls" found in the body, each associated with a principal organ.

explanation:

the fossil record extends back to a dog-like ancestor some 55 million years ago, which gave rise to the first horse-like species 55 to 42 million years ago in the genus eohippus.

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