When bronchitis results in thoracic spine muscle spasms, this is a:

When bronchitis results in thoracic spine muscle spasms, this is a:

• A. Somatosomatic reflex
• B. Somatovisceral reflex
• C. Viscerosomatic reflex
• D. Viscerovisceral reflex

Answer: (C)

A viscerosomatic reflex is at work when a problem in an internal organ provokes a reflex response in the musculoskeletal system. Here, bronchitis irritates visceral afferents that enter the thoracic spinal levels. The spinal cord can then reflexively increase tone and cause spasm in the thoracic paraspinal muscles at those same levels. The organism’s reflex circuitry links the organ (visceral) signals to somatic muscle responses, so the skeletal muscles spasm as a protective or reflexive reaction to the visceral irritation. This direction—visceral input leading to somatic output—is what distinguishes viscerosomatic from the other reflex types. If the stimulus were somatic causing visceral change, or if both sides were visceral-to-visceral or somatic-to-somatic, the classification would be different. But with visceral bronchitis producing a somatic muscle response in the thoracic spine, viscerosomatic is the fitting label.

A viscerosomatic reflex is at work when a problem in an internal organ provokes a reflex response in the musculoskeletal system. Here, bronchitis irritates visceral afferents that enter the thoracic spinal levels. The spinal cord can then reflexively increase tone and cause spasm in the thoracic paraspinal muscles at those same levels. The organism’s reflex circuitry links the organ (visceral) signals to somatic muscle responses, so the skeletal muscles spasm as a protective or reflexive reaction to the visceral irritation.

This direction—visceral input leading to somatic output—is what distinguishes viscerosomatic from the other reflex types. If the stimulus were somatic causing visceral change, or if both sides were visceral-to-visceral or somatic-to-somatic, the classification would be different. But with visceral bronchitis producing a somatic muscle response in the thoracic spine, viscerosomatic is the fitting label.