1. Mrs. J is in a car accident and her right leg is pinnedunder the crushed dashboard of her car. She is very scared andalthough she is in pain her endogenous pain suppression system iskeeping it manageable. She is finally extracted from her car byemergency services and although she is relieved to be free from hercar, the pain from her leg intensifies. The emergency personnelstart her on a morphine drip (an exogenous pain medication) and sheis transported to the nearest hospital. Unfortunately, her leg istoo damaged to save and has to be amputated. Even though thedamaged leg is removed, Mrs. J still swears that it is therebecause she can feel the pain and tingling coming from her toes.(10 points total)

1. What is the name given to the primary sensory receptorsthat transduce pain? (1)

1. Where does this primary sensory neuron synapse? (Bespecific) (1)

1. What pathway carries pain sensation to the cortex to beperceived? (1)

1. In addition to synapsing at the thalamus before beingrelayed to the cortex a collateral branch from this pathway is alsosent to the reticular formation. What role does the reticularformation play in pain perception? (1)

1. Name and briefly explain the mechanisms associated withtwo different endogenous pain suppression mechanisms that couldhave been activated while Mrs. J was trapped in her car.(4)

1. What name can be given to the phenomenon that makesMrs. J believe her limb is still there? (1)

1. Briefly describe how this occurs. (1)