Answer
In the free upper limbs the flexor muscles are in the anterior compartment. By contrast in the free lower limbs the flexor muscles are located in the posterior component
Work Step by Step
The lower limbs are designed for stability and weight bearing. The muscles in these members are larger and stronger than corresponding muscles in the free upper limbs.
The muscles in the anterior compartment of the free upper limbs contract to flex the fore arm around the elbow joint. These muscles are the brachialis, the brachioradialis and the biceps brachii. In the free forelimbs, the extensors muscles are in the posterior compartment ; these are the triceps femoris and the Aconeus.
In the free lower limbs locations are reversed: flexors ( biceps femoris, semitendinosus, semimembranosus) are in the posterior component . However, extensors--rectus femoris, vastus lateralis, vastus medialis, vastus intermedius, and sartorius-- are in the anterior compartment.
