The …………………………………………………..

The …………………………………………………. is a large, C-shaped nerve fiber bundle found beneath the cerebral cortex. It stretches across the midline of the brain, connecting the left and right cerebral hemispheres. It makes up the largest collection of white matter tissue found in the brain. What is the name of the structure indicated by the letter E?  

…………………………….  are the fundamental unit…

…………………………….  are the fundamental units of the brain and nervous system, the cells responsible for receiving sensory input from the external world, for sending motor commands to our muscles, and for transforming and relaying the electrical signals at every step in between. (Labeled with letter A)