4) (10 pts) An injured patient comes into a clinic with abnormal movement in the

Question

4) (10 pts) An injured patient comes into a clinic with abnormal movement in their right leg. Patient A can feel pain normally but is unable to quickly withdraw their leg from a pain stimulus. Patient A responds normally to pain in their left leg. You test the stretch reflex on their right legs using the type ofrubber mallet used in the doctor's office and find that Patient A has no reflexive responses. Patient A has a normal stretch reflex in their left leg. What potential part(s) are of the nervous system were probably damaged in this patient? Explain your reasoning.

Explanation / Answer

Here the patient A has damage in the motor neuron ,more specifically the LOWER MOTOR NEURON LESION of the right leg.

Points to be understood :-THE REFLEX ARC

The reflex arc is a neural pathway which controls the reflex .

It is formed by -1.Receptor 2 .sensory neuron 3.relay neuron 4.the motor neuron

The petellar reflex is effected if any level of the reflex arc is damaged .

The patient A perceives the pain sensation properly this indicates that the receptors ,the sensory system,the Relay center of the patient is intact, this eliminates the probability of receptor, sensory system,relay center damage in nervous system.

The patient A is having difficulty to elicit the knee reflex /patellar reflex, or he is not able to elicit the reflex that is the reflexs are absent ,this concludes that the damage must be in the motor system .

The root value of the nerves supplying the patellar tendon is L2,L3,L4.

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