Peripheral Nerve Anatomy
A 45-year-old right-hand-dominant office worker presents with progressive numbness in the little finger and medial half of the ring finger over 3 months. She reports awakening with elbow flexed and symptoms worse in the morning. Examination reveals weakness of finger abduction/adduction and positive Froment's sign. You review the anatomy of the ulnar nerve with the trainee. Regarding the anatomical course and clinical features of the ulnar nerve:
Mark each as TRUE or FALSE
The ulnar nerve originates from the medial cord of the brachial plexus (C8-T1 roots), passes posteri...
The ulnar nerve supplies all interossei (3 palmar, 4 dorsal), the medial two lumbricals (3rd and 4th...
The ulnar nerve passes anterior to the medial epicondyle through the cubital tunnel; Osborne's ligam...
The Ulnar Paradox describes why high lesions cause LESS clawing than low lesions: in high lesions (e...
Froment's sign tests adductor pollicis function: when asked to hold paper between thumb and index fi...
Answer the questions to see explanations
Click T (True) or F (False) for each option