Biomechanics Exam 1: Shoulder Girdle

What are the major muscles involved in the downward rotation of the shoulder girdle?

Levator scapulae, pectoralis minor, rhomboid major, and rhomboid minor.

What are the two articulations that occur with the shoulder girdle?

Manubrium/clavicle and scapula/torso.

What are the major muscles involved in the retraction or adduction of the shoulder girdle?

Middle trapezius, levator scapulae, rhomboid major, and rhomboid minor.

What is the function of the clavicle?

Acts as a spring for shock absorption in the shoulder girdle and can alleviate greater impact and pressure.

What two bones make up the shoulder girdle?

Clavicle and scapula.

What sort of joint movement classification is found in the shoulder girdle?

Diarthrotic joints.

What is a structural component of the sternoclavicular joint (articulation between that manubrium and the clavicle) that serves shock absorption purposes?

Fibrocartilage disk (meniscus) between manubrium/costal cartilage and clavicle.

What are the major muscles involved in the protraction or abduction of the shoulder girdle?

Pectoralis minor and serratus anterior.

What are the major muscles involved in shoulder girdle depression?

Pectoralis minor and lower trapezius.

What sort of impact does the shoulder girdle protect against, particularly?

Side impact for shock absorption.

What three joints make up the shoulder girdle?

Sternoclavicular, acromioclavicular, and coracoclavicular.

What are the major muscles involved in shoulder girdle elevation?

Upper trapezius, levator scapulae, rhomboid major, and rhomboid minor.

What are the major muscles involved in the upward rotation of the shoulder girdle?

Upper trapezius, lower trapezius, and serratus anterior.