This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Special Senses, Subject name: Physiology
A man when touches a hot object, the sensation of heat is not perceived. Signal reaches the thalamus but is not transmitted to postcentral gyrus. Which of the following is responsible for this? 
Select and explain. 
A. Second order neuron, B. First order neuron, C. Third order neuron, D. Receptor
C: Third order neuron
Answer: C: Third order neuron 
Explanation: Third order neuron (teiary neuron) does not transmit the signal from thalamus to the cerebral coex (Postcentral gyrus) in this case. Teiary neuron acts as a pathway between thalamus and the postcentral gyrus. Second-order neurons project to the thalamus and teiary neuron project to postcentral gyrus.