1. Medial 1/3 of the superior nuchal line of the occipital bone

2. External occipital protuberance

3. Ligamentum nuchae

4. 7th cervical and all the thoracic vertebral spinous processes and the corresponding supraspinous ligaments

1. Lateral 1/3 of the clavicle (superior fibers)

2. Acromion process, spine of the scapula (middle fibers)

3. Base of scapular spine (inferior fibers)

1. Spinal part of accessory nerve (C.N. 11)

2. Ventral rami of 3rd and 4th cervical nerves

1. Lower trapezius draws the scapula down

2. Middle trapezius adducts the scapula

3. Upper trapezius draws the scapular upward

4. Rotation of scapula; upper and lower fibers work together in force couple to upwardly rotate the scapula