A mid-anterior forearm laceration could compromise which structure?

• A. Median nerve
• B. Brachial artery
• C. Flexor digitorum superficialis
• D. Pronator teres

Answer: (A)

In the mid-anterior forearm, the median nerve runs through the anterior compartment, traveling between the flexor digitorum superficialis (FDS) and flexor digitorum profundus (FDP) after passing between the heads of pronator teres. A laceration here would directly threaten the nerve, which carries motor signals to most of the forearm flexors and provides sensation to the lateral palm and fingers. Damaging it in this region would produce weakness of many finger flexors and altered sensation, a clinically significant deficit that aligns with the nerve’s known course in the middle forearm.

The brachial artery, by contrast, is a higher, proximal vessel that bifurcates into the radial and ulnar arteries near the elbow, so a mid-forearm wound is less likely to compromise it. While a laceration could involve a muscle like flexor digitorum superficialis, the structure whose injury best matches the location and clinical consequence is the median nerve. The pronator teres is nearby and the nerve passes close to or between its heads, but the nerve itself is the structure most characteristically at risk in a mid-forearm laceration.