<prompt> Gall stone pain referred to Shoulder pain Nerve root valuesC3-C5C2-C8T8-T9T4-T6  <response>: Ans. a C3- C5Ref: Long Cases in Surgery by RRMBoas Sign: In Cholecystitis, there is irritation of nociceptors present in Diaphragm which send afferent signals via C3C4C5 to the dorsal horn of spinal cord. C4 dermatome covers the shoulder and converges on same area of spinal cord and hence interpreted as pain coming from shoulder in Gallbladder pain. 