The simulation visually demonstrates viscero-somatic convergence by showing visceral afferent fibers from a selected organ and somatic afferent fibers from a body-surface dermatome both synapsing onto the same dorsal horn projection neuron, then tracing how the ambiguous signal ascends to the brain and gets interpreted as skin-based pain.
Select an organ, such as the heart, gallbladder, kidney, or appendix, to see its visceral afferent pathway highlighted alongside the somatic dermatome it converges with in the spinal cord. Adjust the intensity of visceral signaling to observe how stronger organ input can overcome the brain's default somatic interpretation, and toggle a stage slider on the appendicitis model to watch pain migrate from periumbilical to right lower quadrant as parietal peritoneal irritation begins.
Organ selector (heart, gallbladder, kidney, appendix), visceral signal intensity slider, dermatome highlight toggle, and an appendicitis progression stage slider showing periumbilical-to-right-lower-quadrant pain migration.
Did you know that referred shoulder-tip pain from diaphragmatic irritation, sometimes from internal bleeding after trauma, is called Kehr's sign, and that recognizing it can reveal a life-threatening abdominal emergency even when the abdomen itself feels unremarkable on examination?
The simulation visually demonstrates viscero-somatic convergence by showing visceral afferent fibers from a selected organ and somatic afferent fibers from a body-surface dermatome both synapsing onto the same dorsal horn projection neuron, then tracing how the ambiguous signal ascends to the brain and gets interpreted as skin-based pain.
The simulation visually demonstrates viscero-somatic convergence by showing visceral afferent fibers from a selected organ and somatic afferent fibers from a body-surface dermatome both synapsing onto the same dorsal horn projection neuron, then tracing how the ambiguous signal ascends to the brain and gets interpreted as skin-based pain.
Select an organ, such as the heart, gallbladder, kidney, or appendix, to see its visceral afferent pathway highlighted alongside the somatic dermatome it converges with in the spinal cord. Adjust the intensity of visceral signaling to observe how stronger organ input can overcome the brain's default somatic interpretation, and toggle a stage slider on the appendicitis model to watch pain migrate from periumbilical to right lower quadrant as parietal peritoneal irritation begins.
Did you know that referred shoulder-tip pain from diaphragmatic irritation, sometimes from internal bleeding after trauma, is called Kehr's sign, and that recognizing it can reveal a life-threatening abdominal emergency even when the abdomen itself feels unremarkable on examination?