<Tr> <Th> FMA </Th> <Td> 76745 </Td> </Tr> <Tr> <Td_colspan="2"> Anatomical terms of neuroanatomy (edit on Wikidata) </Td> </Tr> <P> The projection fibers consist of efferent and afferent fibers uniting the cortex with the lower parts of the brain and with the spinal cord . In human neuroanatomy, bundles of axons (nerve fibres) called tracts, within the brain, can be categorized by their function into association fibers, projection fibers, and commissural fibers . </P> <P> The principal efferent strands are: </P>

Projection fibers in the brain mainly connect what