Extrinsic Muscles of the Back

Question 1

What are the actions of the descending part of the trapezius?

Answer 1

Cervical spine extension/hyperextension
Shoulder retraction (scapula adduction)
Head and cervical spine lateral flexion
Shoulder elevation

Question 2

What are the actions of the transverse part of the trapezius?

Answer 2

Cervical spine extension/hyperextension
Shoulder retraction (scapula adduction)
Head and cervical spine lateral flexion
Shoulder elevation

Question 3

What are the actions of the ascending part of the trapezius?

Answer 3

Cervical spine extension/hyperextension
Shoulder retraction (scapula adduction)
Head and cervical spine lateral flexion
Shoulder depression

Question 4

What are the actions of the latissimus dorsi?

Answer 4

Shoulder retraction (scapula adduction)
Shoulder depression
Arm medial rotation (isolated)
Shoulder adduction
Shoulder extension/hyperextension

Question 5

What are the actions of the serratus posterior ingerior?

Answer 5

Depresses the ribs at their costovertebral joints.

Question 6

What are the actions of the rhomboid major?

Answer 6

Shoulder retraction (scapula adduction)

Question 7

What are the actions of the rhomboid minor?

Answer 7

Shoulder retraction (scapula adduction)

Question 8

What are the actions of the serratus posterior superior?

Answer 8

Elevates the ribs at their costovertebral joints.

Question 9

What are the actions of the levator scapulae?

Answer 9

Cervical spine lateral flexion

Shoulder elevation