Pnb 2xb3 Review 230 Correctly Answered Questions Latest Update

What is referred pain? Why does it occur? {Ans: - Referred pain is when pain/damage to an internal organ is felt as pain on the skin - Referred pain is caused by convergence of visceral and cutaneous afferents onto a single dorsal horn neuron, and inference by the brain - The patch of skin where pain is perceived and the injured organ have A delta or C axons that synapses onto the same second order neuron in the STT}Describe the topographic arrangements of the DCML and STT pathways. {Ans: In both pathways, axons that come in most caudally travel laterally the furthest. Another way of thinking about this is that the more rostrally you come in, the sooner you turn and ascend. In the DCML the most caudal axons are closest to the midline. Arrangement is as such: C T L S | S L T C In the STT, because of early decussation, the most caudal axons are furthest from the midline. Arrangement is as such: S L T C | C L T S}What is anencephaly? What is a risk factor? {Ans: Anencephaly occurs when the neural tube fails to fully close rostrally. Much of