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Westphal's sign is the clinical correlate of the absence or decrease of patellar reflex or knee jerk. Patellar reflex or knee jerk is a kind of deep or stretch reflex where an application of a stimulus to the patellar tendon such as strike by a solid object or hammer caused the leg to extend due to such stimulus causes the quadriceps femoris muscle to contract. It is named for Karl Friedrich Otto Westphal (1833-1890).〔C. F. O. Westphal. Über einige durch mechanische Einwirkung auf Sehnen und Muskeln hervorgebrachte Bewegungs-Erscheinungen. Archiv für Psychiatrie und Nervenkrankheiten, Berlin, 1875, 5: 803-834.〕 ==Associated conditions== Westphal's sign has a clinical significance used in determining neurodisorders or diseases such as: * receptor damage, peripheral nerve disease, involving the dorsal(sensory) columns of the spinal cord and cerebellar lesions * lesions present within the motor cortex of the brain or the pyramidal tracts which it combined with muscular spasms * complete interruption of sensory and/or motor impulse transmission in the femoral nerve 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Westphal's sign」の詳細全文を読む スポンサード リンク
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