Middle trapezius
Back
- Origin
- Spinous processes of the upper thoracic vertebrae (about C7 to T3)
- Insertion
- Acromion and spine of the scapula
- Action
- Retracts the scapula (pulls the shoulder blades together)
The horizontal band of the trapezius. Rows, face pulls and rear-delt work all rely on it to pull the shoulder blades back.