rigidities,cogwheel 《英文msh詞典》Rigidities,Cogwheel ; [入口詞] Rigidities,Cogwheel ; [主題詞] Muscle Rigidity ; [英文釋義] Continuous involuntary sustained muscle contraction which is often a manifestation of BASAL GANGLIA DISEASES. When an affected muscle is passively stretched,the degree of resistance remains constant regardless of the rate at which the muscle is stretched. This feature helps to distinguish rigidity from MUSCLE SPASTICITY. (From Adams et al.,Principles of Neurology,6th ed,p73)
rigidities,decorticate 《英文msh詞典》Rigidities,Decorticate ; [入口詞] Rigidities,Decorticate ; [主題詞] Decerebrate State ; [英文釋義] A condition characterized by abnormal posturing of the limbs that is associated with injury to the brainstem. This may occur as a clinical manifestation or induced experimentally in animals. The extensor reflexes are exaggerated leading to rigid extension of the limbs accompanied by hyperreflexia and opisthotonus. This condition is usually caused by lesions which occur in the region of the brainstem that lies between the red nuclei and the vestibular nuclei. In contrast,decorticate rigidity is characterized by flexion of the elbows and wrists with extension of the legs and feet. The causative lesion for this condition is located above the red nuclei and usually consists of diffuse cerebral damage. (From Adams et al.,Principles of Neurology,6th ed,p358)