projection fibers in the brain mainly connect what
Projection fiber 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.
Spinal cord The spinal cord is the main pathway for information connecting the brain and peripheral nervous system.[2][3] Much shorter than its protecting spinal column, the human spinal cord originates in the brainstem, passes through the foramen magnum, and continues through to the conus medullaris near the second lumbar vertebra before terminating in a fibrous extension known as the filum terminale.