<P> There are numerous models available from various commercial sources . </P> <P> The strength of a reflex is used to gauge central and peripheral nervous system disorders, with the former resulting in hyperreflexia, or exaggerated reflexes, and the latter resulting in hyporeflexia or diminished reflexes . However, the strength of the stimulus used to extract the reflex also affects the magnitude of the reflex . Attempts have been made to determine the force required to elicit a reflex, but vary depending on the hammer used, and are difficult to quantify . </P> <P> The Taylor hammer is usually held at the end by the physician, and the entire device is swung in an arc - like motion onto the tendon in question . The Queen Square and Babinski hammers are usually held perpendicular to the tendon in question, and are passively swung with gravity assistance onto the tendon . </P> <P> The Jendrassik maneuver, which entails interlocking of flexed fingers to distract a patient and prime the reflex response, can also be used to accentuate reflexes . In cases of hyperreflexia, the physician may place his finger on top of the tendon, and tap the finger with the hammer . Sometimes a reflex hammer may not be necessary to elicit hyperreflexia, with finger tapping over the tendon being sufficient as a stimulus . </P>

Where do you hit to test your reflexes