Which muscle structures attach to the coracoid process and the radial tuberosity?

Which muscle structures attach to the coracoid process and the radial tuberosity?

• A. Triceps brachii
• B. Biceps brachii
• C. Deltoid
• D. Subscapularis

Answer: (B)

The biceps brachii is the correct choice because this muscle attaches at two significant sites: the coracoid process of the scapula and the radial tuberosity of the radius. The short head of the biceps brachii originates from the coracoid process, and both heads of the muscle converge to insert at the radial tuberosity. This attachment plays a crucial role in the muscle's function in elbow flexion and supination of the forearm. The triceps brachii, while an important muscle in the upper arm, does not have attachments to the coracoid process; instead, it originates from the humerus and the scapula. The deltoid primarily attaches to the lateral aspect of the clavicle, acromion, and spine of the scapula, contributing to shoulder movements but not to the specified sites. The subscapularis, a muscle of the rotator cuff, primarily attaches to the subscapular fossa of the scapula and the lesser tubercle of the humerus, which also does not include the coracoid process or radial tuberosity. Thus, the biceps brachii's specific attachments are key to its role in movements of the arm

The biceps brachii is the correct choice because this muscle attaches at two significant sites: the coracoid process of the scapula and the radial tuberosity of the radius. The short head of the biceps brachii originates from the coracoid process, and both heads of the muscle converge to insert at the radial tuberosity. This attachment plays a crucial role in the muscle's function in elbow flexion and supination of the forearm.

The triceps brachii, while an important muscle in the upper arm, does not have attachments to the coracoid process; instead, it originates from the humerus and the scapula. The deltoid primarily attaches to the lateral aspect of the clavicle, acromion, and spine of the scapula, contributing to shoulder movements but not to the specified sites. The subscapularis, a muscle of the rotator cuff, primarily attaches to the subscapular fossa of the scapula and the lesser tubercle of the humerus, which also does not include the coracoid process or radial tuberosity.

Thus, the biceps brachii's specific attachments are key to its role in movements of the arm