How are visual areas of the brain connected to motor areas for the sensoryguidance of movement?

Visual areas of the brain must be connected to motor areas for the sensory guidance of movement. The first step in the pathway from the primary visual cortex is by way of the dorsal stream of visual areas in the parietal lobe . The fact that monkeys can still guide their limbs visually after cortico- cortical fibres have been severed suggests that there are subcortical route s that link visual and motor areas of the brain. The pathway that runs from the pens and cerebellum is the largest of these. Pontine cells that receiv e inputs from visual cortical areas or the superior colliculus respond vigo rously to appropriate visual stimuli and project widely on the cerebellar c ortex. A challenge for future research is to elucidate the role of these ce rebellar target areas in visuo-motor control.