movements

Question 1

Shoulder joint & shoulder girdle work together in carrying out upper extremity activities

Answer 1

Shoulder girdle movement is not dependent upon the shoulder joint & its muscles

Question 2

Shoulder girdle muscles

Answer 2

1. Stabilize scapula so the shoulder joint muscles will have a stable base from which to exert force for moving the humerus
2. Contract to maintain scapula in a relatively static position during shoulder joint actions
3. Contract to move shoulder girdle & to enhance movement of upper extremity when shoulder goes through extreme ranges of motion

Question 3

Lateral tilt or internal rotation (outward tilt)

of scapula

Answer 3

during abduction (Protraction)
scapula rotates about its vertical axis resulting in medial border moving away from the vertebral column

Question 4

Medial tilt or external rotation (return from lateral tilt, inward tilt)

of scapula

Answer 4

during extreme adduction (retraction)
scapula rotates about its vertical axis resulting in medial border moving back toward the vertebral column

Question 5

Anterior tilt (upward tilt)

of scapula

Answer 5

rotational movement of scapula about frontal axis occurring during glenohumeral hyperextension
superior border moving anteroinferiorly & inferior angle moving posterosuperiorly

Question 6

Posterior tilt (downward tilt)

of scapula

Answer 6

rotational movement of scapula about frontal axis occurring during glenohumeral hyperflexion
superior border moving posteroinferiorly & inferior angle moving anterosuperiorly

Question 7

Synergy with muscles of glenohumeral joint

Answer 7

1. Without the accompanying scapula movement humerus can only be raised into approximately 60 degrees of total shoulder abduction & flexion
2. First 60 degrees of shoulder abduction & flexion: Humerus moves independently of scapula in the sagittal and frontal plane
3. After that, for every 2 degrees of humeral motion, 1 degree of scapular motion must accompany it

Question 8

appropriate muscles of both joints working in synergy to accomplish the desired action of entire upper extremity

Answer 8

Ex. to raise our hand out to side laterally as high as possible, the serratus anterior & trapezius (middle & lower fibers) muscles upwardly rotate scapula as supraspinatus & deltoid initiate glenohumeral abduction

Question 9

“I want to put my hand in front of my face”
What is happening at Scapula and Clavicle?

Answer 9

upward rotation of scapula
elevation of scapula
protraction of scapula
posterior rotation of clavicle [lateral border rotates back]
lateral border elevation of clavicle
lateral border of clavicle comes forward
clavicle comes forward up and posterior rotating

Question 10

“I want to reach behind in back pocket”
What is happening at Scapula and Clavicle?

Answer 10

downward rotation of scapula
depression of scapula
retraction of scapula [pulling it into vertebral column]
depression of clavicle
anterior rotation of clavicle [lateral side rolling forward]
[clavicle might move back a little bit but other two are main motions]