Extensor Carpi Radialis Longus originates from which location?

Extensor Carpi Radialis Longus originates from which location?

• A. Lateral Epicondyle of Humerus
• B. Medial Supracondylar Ridge
• C. Intertubercular Groove
• D. Lateral Supracondylar Ridge of Humerus

Answer: (D)

Muscle origins are the anchor points that set the muscle’s line of pull. Extensor Carpi Radialis Longus attaches proximally to the lateral supracondylar ridge of the humerus, just above the lateral epicondyle. From there its tendon runs to the base of the second metacarpal, enabling it to extend and abduct the wrist. This ridge is the specific landmark for this muscle's origin, distinguishing it from other nearby landmarks. The lateral epicondyle is the origin for other forearm extensors, the intertubercular groove houses the tendon of the long head of the biceps brachii, and the medial supracondylar ridge isn’t the origin for this muscle. So the lateral supracondylar ridge of the humerus is the correct origin.

Muscle origins are the anchor points that set the muscle’s line of pull. Extensor Carpi Radialis Longus attaches proximally to the lateral supracondylar ridge of the humerus, just above the lateral epicondyle. From there its tendon runs to the base of the second metacarpal, enabling it to extend and abduct the wrist. This ridge is the specific landmark for this muscle's origin, distinguishing it from other nearby landmarks. The lateral epicondyle is the origin for other forearm extensors, the intertubercular groove houses the tendon of the long head of the biceps brachii, and the medial supracondylar ridge isn’t the origin for this muscle. So the lateral supracondylar ridge of the humerus is the correct origin.