Shoulder 1

Question 1

Muscles in rotator cuff

SITS

Answer 1

• subscapularis
• infraspinatus
• Teres minor
• Supraspinatus

Question 2

Subscapularis

1) origin
2) insertion
3) action

Answer 2

1) anterior portion of scapula within the subscapularis fossa
2) lesser tubercle
3) medial rotation, prevents hikers head sliding upwards

Question 3

Supraspinatus

1) origin
2) insertion
3) action

Answer 3

1) posterior surface of scapula within supraspinous fossa
2) superior great tubercle
3) abducts humerous, prevents downwards dislocation

Question 4

Infraspinatus

1) origin
2) insertion
3) action

Answer 4

1) posterior surface of scapula within infraspinous fossa
2) greater tubercle
3) laterally humerous, prevents humeral head sliding upwards

Question 5

Teres minor

1) origin
2) insertion
3) action

Answer 5

1) lateral border of scapula
2) greater tubercle
3) lateral rotates humerous, prevents huneral head sliding upwards

Question 6

Levator scapula

1) origin
2) insertion
3) action

Answer 6

1) transverse process of vertebra C1-C3
2) superior medial border of scapula
3) elevation and medial rotation of scapula

Question 7

Trapezius

1) origin
2) insertion
3) action

Answer 7

1) external occipital protuberance, ligamentum nuchae, medial 1/3 of superior Nuchal line, spinous processes C7-T12 and supraspinous ligament
2) lateral 3rd of clavicle, acromion, spine of scapula
3) lateral rotation, elevation, retraction and depression

Question 8

Biceps brachii

1) origin
2) insertion
3) action

Answer 8

1) LH supraglenoid tubercle, SH - coracoid process
2) radial tuberosity, bicipital groove
3) flexes and shipmates forearm

Question 9

Triceps brachii

1) origin
2) insertion
3) action

Answer 9

1) LH - infraglenoid process
Lat H - posterior upper 3rd of humerous
Med H - posterior lower 3rd of humerous

2) olecranon process
3) extends forearm