Upper Limb

Question 1

Trapezius:

1. action
2. innervation

Answer 1

1. fully rotates scapula, elevates & retracts shoulder, adduction of scapula
2. accessory nerve

Question 2

latissimus dorsi:

1. action
2. innervation

Answer 2

1. extends, adducts & medially rotates humerus

2. thoracodorsal nerve (C6-8)

Question 3

deltoid:

1. origin
2. insertion
3. action
4. innervation

Answer 3

1. lateral 1/3 clavicle, acromion, scapular spine
2. deltoid tuberosity (humerus)
3. abduction
4. axillary nerve (C5-6)

Question 4

supraspinatus:

1. action
2. innervation

Answer 4

1. initiates abduction, lateral rotation

2. suprascapular nerve (C5-6)

Question 5

infraspinatus:

1. action
2. innervation

Answer 5

1. lateral rotation

3. subscapular nerve (C5-6)

Question 6

teres minor:

1. origin
2. insertion
3. action
4. innervation

Answer 6

1. lateral scapula
2. greater tubercle (humerus)
3. lateral rotation, weak adduction
4. axillary nerve (C5-6)

Question 7

teres major:

1. origin
2. insertion
3. action
4. innervation

Answer 7

1. inferior angle of scapula
2. intertubercular groove (humerus)
3. extension of arm, adducts and medially rotates shoulder
4. lower subscapular nerve (C5-6)

Question 8

subscapularis:

1. action
2. innervation

Answer 8

1. prevents anterior displacement, medially rotates and adducts
2. upper & lower subscapular nerves (C5-6)

Question 9

pectoralis major:

1. origin
2. insertion
3. action
4. innervation

Answer 9

1. clavicle, sternum, aponeurosis of EO
2. intertubercular groove (humerus)
3. adduction, medial rotation, flex shoulder
4. medial and lateral pectoral nerves (C5-T1)