Which of the following muscles is part of the posterior compartment of the forearm?

Question

BlackTom AI · Accepted Answer

To tackle this question, I’ll examine each listed muscle and assign it to the correct forearm compartment based on standard anatomy.
Option 1: Palmaris longus m. — This muscle is a flexor located in the anterior (flexor) compartment of the forearm. It assists with wrist flexion and is absent in some people, but it is not a posterior forearm muscle.
Option 2: Flexor carpi ulnaris m. — Also a flexor in the anterior compartment, innervated by the ulnar nerve, and not part of the posterior compartment that contains extensor muscles.
Option 3: Flexor pollicis brevis m. — This muscle belongs to the thenar group of the hand, acting as a short flexor of the thumb, and is innervated from the intrinsic hand muscles rather than the forearm posterior compartment; it is not a posterior forearm muscle.
Option 4: Extensor digitorum m. — This is a classic posterior compartment muscle of the forearm. It extends the fingers at the metacarpophalangeal joints and is one of the primary extensors belonging to the superficial layer of the posterior compartment.
Option 5: Flexor pollicis longus m. — This is a deep flexor located in the anterior compartment of the forearm, responsible for flexing the thumb, and clearly not part of the posterior compartment.

Thus, after evaluating each option, the muscle that correctly fits the posterior compartment designation is Extensor digitorum m., while all other options belong to the anterior (flexor) compartment or are not forearm extensors. The reasoning hinges on understanding the functional groupings: posterior forearm muscles are mainly extensors, whereas the listed alternatives are flexors or intrinsic hand muscles and not part of the posterior forearm compartment.

Which of the following muscles is part of the posterior compartment of the forearm?

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