An excellent overview of brains, covering history (with a bit too much history), invertebrate brains, vertebrate brains, and finally, the human brain. The human brain is analyzed as a system of 4 functional parts: perception (input), cognition (interneuron processing), motor (output), and physiological state (circadian rhythm, homeostatic moods, hunger, depression, anxiety, etc).
Some of the diagrams are hard-going due to their somewhat archaic style (from the 1880s to 1930s), with quite a few diagrams from Cajal's books! But careful reading of them shows that they are quite clear -- if in a different style, like an archaic accent, and make their own kind of sense.