Which muscle originates from ribs 1-8?

Which muscle originates from ribs 1-8?

• A. Serratus Anterior
• B. Pectoralis Minor
• C. External Intercostals
• D. Latissimus Dorsi

Answer: (A)

The statement tests where a muscle attaches to the rib cage to understand its role in moving the shoulder girdle. Serratus Anterior arises from the outer surfaces of the first eight ribs along the lateral chest wall, and it inserts on the medial border of the scapula. This rib-origin pattern is characteristic of Serratus Anterior, and it lets the muscle protract and stabilize the scapula against the thorax. Pectoralis Minor, for comparison, originates from ribs 3–5 and attaches to the coracoid process, which is a different rib range. External intercostals run between the ribs and originate from the rib above, not from the chest wall ribs in the same way, and Latissimus Dorsi has origins on the back and lower ribs (9–12), not the 1–8 region.

The statement tests where a muscle attaches to the rib cage to understand its role in moving the shoulder girdle. Serratus Anterior arises from the outer surfaces of the first eight ribs along the lateral chest wall, and it inserts on the medial border of the scapula. This rib-origin pattern is characteristic of Serratus Anterior, and it lets the muscle protract and stabilize the scapula against the thorax.

Pectoralis Minor, for comparison, originates from ribs 3–5 and attaches to the coracoid process, which is a different rib range. External intercostals run between the ribs and originate from the rib above, not from the chest wall ribs in the same way, and Latissimus Dorsi has origins on the back and lower ribs (9–12), not the 1–8 region.