Answer
The cross-section shown in Part C was taken too high up on the arm to include the extensor pollicis longus and the extensor indicis
Work Step by Step
The extensor pollicis longus extends from the ulna to the distal phalanx of digit #1 (thumb). The extensor indicis runs from the posterior surface of the ulna to the middle and distal phalanges of the index finger.
