Glenohumeral muscles

Question 1

O and I of pectoralis major

Answer 1

O = medial half of clavicle, sternum, and costal cartilages of ribs 1-6
I = Lateral lip of the intertubercular groove

Question 2

Concentric actions of the pectoralis major

Answer 2

Both heads - adduction, internal rotation and horizontal adduction
Clavicular head - flexion

Question 3

Concentric actions of the coracobrachialis

Answer 3

Flexion and adduction

Question 4

O and I of the deltoid

Answer 4

O = Anterior - Lateral 1/3 of the clavicle
Middle - Acromion process
Posterior - Spine of the scapula
I = Deltoid tuberosity of the humerus

Question 5

Concentric actions of deltoid

Answer 5

All three portions acting together = Abduction
Anterior - Flexion, Horizontal adduction
Posterior- Extension, Horizontal abduction

Question 6

O and I of the latissimus dorsi

Answer 6

O = Inferior angle of the scapula
* T7-T12 spinous processes
* Ribs 9-12
* Thoracolumbar fascia
* Posterior crest of the ilium
I = Intertubercular groove of the humerus

Question 7

Concentric actions of the latissimus dorsi

Answer 7

Extension, adduction and internal rotation

Question 8

Concentric actions of the teres major

Answer 8

SAME AS LATTISUMIS DORSI
extension, adduction and internal rotation

Question 9

4 rotator cuff muscles

Answer 9

Supraspinatus, Infraspinatus, Teres minor, Subscapularis
SITS muscles

Question 10

Concentric action of the supraspinatus

Answer 10

Abduction

Question 11

Concentric actions of the infraspinatus and teres minor

Answer 11

External rotation, Horizontal abduction

Question 12

Concentic action of the subscapularis

Answer 12

Internal rotation