Where does the serratus posterior superior originate?

The origin of the serratus posterior superior muscle is indeed found at the spinous processes (SPs) of the cervical and upper thoracic vertebrae, specifically from C7 to T3, and it also has contributions from the nuchal ligament at the back of the neck.

This dual origin allows the serratus posterior superior to effectively assist in elevating the ribs during inspiration and enhancing the movement of the upper thoracic region. The nuchal ligament provides an anchor point for the muscle, facilitating its role in movements of the neck and upper back. Thus, recognizing that both C7 to T3 and the nuchal ligament are involved is essential for understanding the full anatomical context and function of this muscle in respiratory mechanics and postural alignment.