FCEM2-1260

FCEM2-1260

A 45-year-old patient has sustained an injury to their left upper limb, resulting in a peripheral neuropathy. Upon examination, the patient presents with clawing of their hand, with hyperextension of the metacarpophalangeal joints and flexion of the distal and proximal interphalangeal joints of the little and ring fingers. However, their wrist flexion remains normal. Sensory loss is observed over the palmar surface of the medial one and a half fingers, while sensation in the rest of the hand and forearm, including the palm and dorsal aspect of all fingers, is normal. Additionally, Froment’s sign is positive.

Which specific nerve has been affected in this case?