Shoulder extensors

Question 1

Latissimus dorsi

Answer 1

O: spinous processes of lower six thoracic and all lumbar and sacral vertebra, intervening supra- and interspinous ligaments, outer lip of iliac crest, outer surface of lower three or four ribs, inferior angle of scapula

I: intertubercular sculus of humerus

D:

A: extends, adducts and medially rotates shoulder

N: thoracodorsal nerve (C6-8)

Question 2

teres major

Answer 2

O: dorsal surface of inferior scapular angle

I: medial lip of intertubercular sulcus of humerus

D:

A: extends, adducts Nd medially rotates shoulder

N: lower scapular nerve (C5-7)

Question 3

pectoralis major

Answer 3

O: Clavicular attachment - sternal half of anterior surface of clavicle
Sternal attachment - anterior surface of manubrium, body of sternum, upper six costal cartilages, sixth rib, aponeurosis of external oblique muscle

I: lateral lip of intertubercular sulcus of humerus

D:

A: adducts, medially rotates, flexes and extends shoulder

N: medial and lateral pectoral nerves (C5-T1)

Question 4

deltoid (posterior fibres)

Answer 4

O: lower edge of crest of spine of scapula

I: deltoid tuberosity of humerus

D:

A: extends and laterally rotates shoulder

N: auxillary nerve (C5,6)

Question 5

triceps (long head)

Answer 5

O: infraglenoid tubercle of scapula, shoulder capsule

I: upper surface of olecranon, deep fascia of forearm

D:

A: extends elbow and shoulder

N: radial nerve (C6,8)