Final answer:
Seaman uses the term "neurodystrophic" for the abnormal afferent input related to joint complex dysfunctions that can impact both the somatic and autonomic nervous systems.
Step-by-step explanation:
Seaman proposes the term "neurodystrophic" to describe the abnormal afferent input associated with joint complex dysfunctions. This term relates to the changes in neural input that can result from functional aberrations within the joint complex, which consist of the articulations and surrounding tissues including muscles, tendons, and ligaments. The somatic and the autonomic nervous systems can both be affected by these dysfunctions, leading to a variety of symptoms including pain, dysfunction, and altered reflexes.