27th June 2023

A 40-year-old builder presents with history of increasing difficulty doing his job as he is unable to hold bricks and mix cement

A 40-year-old builder presents with history of increasing difficulty doing his job as he is unable to hold bricks and mix cement like he used to. He also reports chronic neck pain. On examination of his hand, there is wasting and paralysis of the intrinsic hand muscles in that he is unable to hold out his fingers straight. He also has sensory loss to the medial one and half fingers.

Select the SINGLE most likely site of damage from the list below. Select ONE option only.