Ulnar Nerve — Course and Lesions

Regarding the course and anatomical relationships of the ulnar nerve in the upper limb, all of the following statements are correct EXCEPT:

A 52-year-old male carpenter from Delhi presents with a 3-month history of progressive weakness and wasting of the intrinsic muscles of his right hand. On examination, he has a positive Froment's sign and Wartenberg's sign. He reports that the symptoms began after he sustained a fall on his outstretched right hand 4 months ago, with initial severe swelling at the medial aspect of the elbow. Sensation is intact over the dorsal aspect of the hand. Which nerve is most likely compressed, and at what anatomical site?

A 42-year-old woman with a history of repetitive gripping work presents with weakness of thumb adduction and sensory loss in the medial 1.5 fingers. Wrist flexion is normal. Which clinical sign best distinguishes a deep branch (motor) lesion in Guyon's canal from a superficial branch (sensory) lesion at the same site?

Which of the following clinical findings is characteristic of a HIGH ulnar nerve lesion (at or above the elbow)?

A 35-year-old male labourer presents with weakness of finger flexion and loss of sensation over the medial 1.5 fingers. On examination, claw hand deformity is noted. Which is the most common site of ulnar nerve compression in this patient?