This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Physiology
All are true regarding coicospinal tract except? 
Select and explain. 
A. Also called pyramidal tract, B. Maximum fibers arise from primary motor coex, C. Forms pyramids in medulla, D. 80% fibers are crossed
B: Maximum fibers arise from primary motor coex
Answer: B: Maximum fibers arise from primary motor coex 
Explanation: Ans. is 'b' I,e,, Maximum fibers arise from primary motor coex[Ref Principles of medical physiology p.238-239Coicospinal tract is the most impoant tract through which the motor coex controls the activity of the ventral horn cells (alpha-motor neurons) in the spinal cord.It is also called pyramidal tract because they form the pyramid of the medulla.