What is the partial or total loss of memory called?

In Spanish, "el cerebro" is which part of the body? In Spanish, "el corazon" is which part of the body? In Freudian theory, what is the instinctive part of the psyche, alongside the ego and superego? Which philosopher, author of "A Treatise of Human Nature", was born in Edinburgh in 1711? What do you call a being in mythology who is partly divine and partly human? "A partridge in a pear tree" is a gift in which Christmas carol? A pas de trois is a dance for how many people? What is a vertical passage sunk into the ground for mining called?