(a) Corpus callosum
Corpus callosum is present in the brain. The main function is transferring information from one hemisphere to the other.
(b) Central canal
The central canal is located in the center of the spinal cord that runs the entire length and is continuous with the cavities of the brain. It is filled with a fluid called cerebrospinal fluid which acts as a shockproof cushion and works as a medium for the exchange of food materials, waste products, and respiratory gases with neurons.