UE

Question 1

What is the origin of the upper fibers of the trapezius?

Answer 1

External occipital protuberance, medial third of superior nuchal line, ligamentum nuchae, spine of C7

The upper fibers originate from specific anatomical landmarks of the skull and cervical spine.

Question 2

What is the origin of the middle fibers of the trapezius?

Answer 2

Spines of T1-T5

The middle fibers originate from the thoracic spine.

Question 3

What is the origin of the lower fibers of the trapezius?

Answer 3

Spines of T6-T12

The lower fibers originate from the lower thoracic spine.

Question 4

Where do the upper fibers of the trapezius insert?

Answer 4

Lateral third of clavicle

This insertion allows the upper fibers to influence shoulder movement.

Question 5

Where do the middle fibers of the trapezius insert?

Answer 5

Acromion and crest of spine of scapula

The middle fibers play a role in scapular movement.

Question 6

Where do the lower fibers of the trapezius insert?

Answer 6

Aponeurosis at medial end of spine of scapula

This insertion supports the lower fibers’ function in scapular movement.

Question 7

What action do the upper fibers of the trapezius perform?

Answer 7

Elevate, retract, and rotate scapula upward

Additionally, with insertion fixed, they can extend, side bend to the same side, and rotate the head to the opposite side.

Question 8

What action do the middle fibers of the trapezius perform?

Answer 8

Retract scapula

The middle fibers are primarily responsible for pulling the scapula toward the spine.

Question 9

What action do the lower fibers of the trapezius perform?

Answer 9

Retract, depress, and rotate scapula upward

These actions are crucial for scapular stabilization and movement.

Question 10

What nerves innervate the trapezius?

Answer 10

Spinal accessory n. (XIth cranial n.) and ventral rami of C2, 3, 4

The spinal accessory nerve is crucial for motor function, while the ventral rami provide additional sensory and motor innervation.