Patient recieved damage to e ollactor 5 Kevin presents to your office after a mo
ID: 3482834 • Letter: P
Question
Patient recieved damage to e ollactor 5 Kevin presents to your office after a mountain biking accident last weekend during which he fell on his left elbow. He says that since the accident, his forearm alternates between periods of numbness and feeling "like he has hit his funny bone." You test the two-point discrimination on Kevin's left fifth digit and find that it is 6 mm. On his right fifth digit, however, it is less than 1 mm. You also find that his forearm muscles that flex his hand on the left side are very weak, as are most of the intrinsic muscles of his left hand. What has likely happened? How does this explain the results of the two-point discrimination test? (Hint: You may want to refer to Unit 14 pp. 359-388, for help.) mdial nerve natnmy& Physiology in the LaboratoryExplanation / Answer
8. From the above incident we could found the injury is happen to the ulmar nerve while he falling on the elbow. The ulnar nerve runs behind the ulnar nerve and it supplies the flexors of hand and small intrinsic muscles of hand. It also carries sensory supply from the medial half of skin of hand and forearm. So there is weakness of lumbricals and flexors of hand. Also there is lack of sensation of the skin supplied to it. It can be examined by two point discrimination test.
Two point discrimination test is done by testing two points at few centimeters interval by applying pinch, pressure, pain, touch etc. The patient closes the eyes and recognize the two different stimulus at same time. The tests can be repeated by increasing or reducing the distance of the stimulus. In this test we identify the nerve injury, nerve blocks etc.