(a) Corpus callosum

Solution:-

Corpus callosum is present in the brain. The main function is   transferring information from one hemisphere to the other.

(b) Central canal

Solution:-

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.