Which one of the following muscles is found in the anterior compartment of the forearm?

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Starting with the question, we’re asked to identify which muscle sits in the anterior compartment of the forearm. The anatomy of the forearm is classically divided into an anterior (flexor) compartment and a posterior (extensor) compartment, with the anterior group mainly responsible for flexion and pronation.
Option a: Palmaris longus. This muscle is a classic member of the superficial layer of the anterior forearm muscles. It originates from the medial epicondyle of the humerus and inserts into the palmar aponeurosis, contributing to wrist flexion and tensioning the palmar fascia. Its location and function align perfectly with the anterior compartment.
Option b: Anconeus. The anconeus is a small muscle located near the elbow and is considered part of the posterior compartment; it assists in elbow extension rather than wrist flexion, so it does not belong to the anterior compartment.
Option c: Brachioradialis. This muscle is actually situated on the lateral aspect of the forearm and is typically described as part of the radial (lateral) muscular group, often associated with the flexion of the elbow. Its position and primary action place it outside the anterior forearm compartment.
Option d: Abductor pollicis longus. This muscle resides in the posterior/dorsal compartment of the forearm and functions to abduct the thumb and extend at the carpometacarpal joint; it is not an anterior forearm muscle.
Option e: Supinator. The supinator wraps around the upper third of the radius and is a deep muscle of the posterior compartment, responsible for supination of the forearm. It is not located in the anterior compartment.
In summary, among the listed options, the one that matches an anterior forearm muscle with the described course and role is the muscle within the flexor group and toward the palm side, consistent with the anterior compartment.

Which one of the following muscles is found in the anterior compartment of the forearm?

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