Which muscle's insertion is identical to the deltoid's origin?

Which muscle's insertion is identical to the deltoid's origin?

• A. Trapezius
• B. Latissimus Dorsi
• C. Pectoralis Major
• D. Rhomboid Major

Answer: (A)

The main idea here is tracing where muscles attach and how those attachments relate to function. The deltoid starts (its origin) from the clavicle, the acromion, and the spine of the scapula, and it inserts onto the humerus at the deltoid tuberosity. The muscle whose insertion sits on exactly those same bony landmarks—the clavicle, acromion, and spine of the scapula—is the trapezius. That shared insertion point means it matches the deltoid’s origin location. The other muscles insert elsewhere: for example, latissimus dorsi, pectoralis major, and rhomboid major attach to different areas (usually the humerus or the medial border of the scapula), so they don’t share the same insertion as the deltoid’s origin.

The main idea here is tracing where muscles attach and how those attachments relate to function. The deltoid starts (its origin) from the clavicle, the acromion, and the spine of the scapula, and it inserts onto the humerus at the deltoid tuberosity. The muscle whose insertion sits on exactly those same bony landmarks—the clavicle, acromion, and spine of the scapula—is the trapezius. That shared insertion point means it matches the deltoid’s origin location.

The other muscles insert elsewhere: for example, latissimus dorsi, pectoralis major, and rhomboid major attach to different areas (usually the humerus or the medial border of the scapula), so they don’t share the same insertion as the deltoid’s origin.