Editing Cerebral cortex (section)

===Connections===
The cerebral cortex is connected to various subcortical structures such as the [[thalamus]] and the [[basal ganglia]], sending information to them along [[efferent nerve fiber|efferent connections]] and receiving information from them via [[afferent nerve fiber|afferent connections]]. Most sensory information is routed to the cerebral cortex via the thalamus. Olfactory information, however, passes through the [[olfactory bulb]] to the olfactory cortex ([[piriform cortex]]). The majority of connections are from one area of the cortex to another, rather than from subcortical areas; [[Valentino Braitenberg|Braitenberg]] and Schüz (1998) claim that in primary sensory areas, at the cortical level where the input fibers terminate, up to 20% of the synapses are supplied by extracortical afferents but that in other areas and other layers the percentage is likely to be much lower.<ref>{{cite book | vauthors = Braitenberg V, Schüz A | title = Cortex: Statistics and Geometry of Neuronal Connectivity. | location = New York | publisher = Springer Science & Business Media | date = 1998 | isbn = 978-3-540-63816-2 }}</ref>