See Frontal Eye.
The Human Tectum
Midbrain tectum (Wiki)
Brief description of human tectum with undecipherable picture. This is said to be the site of the highest level of sensory-motor integration in animals that don't have a cortex.
Neuroanatomy Tutorial from MIT 9.97
Click on 'tectum of midbrain', and a red arrow will point to it.
Another tutorial from MIT 9.97
Scroll down to 'Midbrain' in the box in the upper left-hand corner and click on the links to see the slides.
SC = superior colliculus
IC = inferior colliculus
Note: there are eight more brain imaging links plus another subindex in Human Neuroanatomy.