Final answer:
A neurologist should consult with a systemic physiologist to understand how a brain injury affects other body systems, as they specialize in how different systems interact and function together.
Step-by-step explanation:
A neurologist seeking to understand how a brain injury affects the interactions of the organs in other body systems should consult with a systemic physiologist. Systemic physiologists specialize in how different body systems work and interact with each other, often at the organ level. In this case, the systemic physiologist could provide valuable insights into how the patient's brain injury is influencing other organ systems and overall body function. They can draw from knowledge of neurophysiology, which explores how the brain, spinal cord, and nerves work together to perform complex functions. Additionally, they understand the neurological exams used to diagnose problems in the nervous system, such as the use of reflex, sensory, and motor control tests, which can help localize the site of the brain injury's impact on body functions.