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The Jendrassik maneuver to reinforce knee-jerk. The Jendrassik maneuver is a medical maneuver wherein the patient clenches the teeth, flexes both sets of fingers into a hook-like form, and interlocks those sets of fingers together.
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The responses from these pathways are often termed medium or long latency stretch reflexes, because the time course is longer due to distance it needs to travel. [7] The central nervous system can influence the stretch reflex via the gamma motoneurons, which as described above control the sensitivity of the reflex.
Abdominal reflex is noted as either present or absent. An absent response can be physiological. Physiological absent response can be due to obesity, frailty, or muscle laxity after multiple pregnancies or abdominal surgery. [1]
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Also, some reflexes in vivo are polysynaptic, with entire muscle groups responding to noxious stimuli. As the body ages, the control of voluntary inhibition decreases in conjunction with the torque of the synapse as joints stiffen and their motor output is reduced. However, this reduction in ability tends to be insignificant. [4]
In medicine, reflexes are often used to assess the health of the nervous system. Doctors will typically grade the activity of a reflex on a scale from 0 to 4. While 2+ is considered normal, some healthy individuals are hypo-reflexive and register all reflexes at 1+, while others are hyper-reflexive and register all reflexes at 3+.