 For example, layer four would receive messages about external temperature changes.The Internal Granular Layer acts as a medium which receives, processes and the sends signals to other parts of the brain, allowing the body to respond in such a way to combat the change in environment.The final section is composed of layers five and six and is known as the infragranular layers; it connects the cerebral cortex with the subcortical regions of the brain, these regions are responsible for long-term memory, motor control and behavioural and emotional responses.