Inverted Reflexes clinical significance

Invertion of Radial Reflex

• On eliciting the supinator jerk, the following response is observed
• There is absence of flexion of  elbow, 
• Instead there is brisk finger flexion,
• Biceps jerk is absent and the triceps jerk is exaggerated. The presence of this lesion suggest this the
• Lesion at  C5>C6 segment.

Invertion of Biceps Reflex

• On eliciting bicep reflex the following are noticed 
• There is no flexion at the elbow
• But instead there is extension at the elbow' due contraction of the triceps muscle.
• Presence of this  reflex indicates that the lesion is at the level of C5 segment

Invertion of Knee Reflex

• On eliciting the knee jerk you can observe the following
• There is no extension of the knee joint 
• But instead there is flexion of the knee due to contraction of the hamstring muscles. 
• Presence of this indicates that the lesion is at the level of L3, 4