When a joint is passively flexed, the resisting force comes from the stretch reflex (or sometimes called tendon reflex) resulting from the extensor muscle being stretched. In upper motor neuron lesions, muscle tonus may increase and resistance of muscle to stretch increases. However, if sufficient force is applied, limb resistance suddenly decreases, presumably mediated by the Golgi tendon reflex (also call autogenic inhibition).
Clasp-knife response
Lymphovascular invasion
Functional symptom
Colonial morphology
Astereognosis
Endaural phenomena
Referred pain
Baricity