Which muscle originates from the nuchal ligament and C7-T3?

• A. Serratus posterior superior
• B. Levator scapulae
• C. Serratus posterior inferior
• D. Trapezius

Answer: (A)

The key idea here is recognizing the origin pattern of the serratus posterior group. Serratus posterior superior starts from the nuchal ligament and from the spinous processes of the lower cervical to upper thoracic vertebrae (C7 through T3). From there, its fibers run laterally to insert on the upper ribs (roughly ribs 2–5), where it helps lift the ribs during inspiration. This specific origin—from the nuchal ligament plus C7–T3—is a defining feature that sets it apart from the other muscles listed. For example, the levator scapulae originates from the transverse processes of C1–C4 and acts on the scapula; serratus posterior inferior originates from T11–L2 and inserts on the lower ribs; trapezius has a broad origin that includes the skull, nuchal ligament, and thoracic spinous processes but extends over a wider region. So the combination of the nuchal ligament and C7–T3 origin points to serratus posterior superior.