Neurologic Exam-Adult | Motor Exam | Anatomy | Traps

Motor Exam - Anatomy 12 - Traps: Hypertonia can be either spasticity or rigidity. Spasticity is from a UMN lesion. It is rate dependent resistance on range of motion with collapse of the resistance at the end of the range of motion. This is called the clasp-knife phenomena. Rigidity is from basal ganglia disease. The resistance to range of motion is not rate or force dependent and is constant throughout the range of motion. This is often referred to as lead pipe or plastic-like rigidity.