This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nervous System, Subject name: Physiology
The reticular formation is a diffuse collection of 
Select and explain. 
A. Only motor neurons, B. Only sensory neurons, C. Only autonomic centres, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: (D) All of the above # Reticular formation, the phylogenetically old reticular core of the brain, occupies the midventral portion of the medulla and midbrain.> It is primarily an anatomic area made up of various neural clusters and fibers with discrete functions.> It contains the cell bodies and fibers of many of the serotonergic, noradrenergic, and adrenergic systems.> It also contains many of the areas concerned with regulation of heart rate, blood pressure and respiration> The RAS is a complex polysynaptic pathway.