Could a degree in psychology lead to...?

Could earning a degree in psychology lead to earning a psychiatry residency? It is my understanding that in order to obtain a psychiatry residency, one must have a medical degree. It also appears that a psychologist, once graduated from graduates school, would hold a medical degree if they were to have taken the appropriate courses. So, my question is, after completing a doctoral degree in psychology, would one be able to apply for a psychiatry residency? Or is said residency only applicable to those who have obtained a sort of basic medical degree?