Physiology

Which of the following is the basis for referred pain?

Visceral pain signals and pain signals from the skin synapse with separate populations of neurons in the dorsal horn

Visceral pain transmission and pain transmission from the skin are received by a common set of neurons in the thalamus

Visceral pain signals are rarely of sufficient magnitude to exceed the threshold of activation of dorsal horn neurons

Some visceral pain signals and pain signals from the skin provide convergent input to a common set of neurons in the dorsal horn