Muscles of the Upper Limb - Posterior Shoulder and Rotator Cuff

Question 1

Name nerve A

Answer 1

A - Dorsal scapular nerve

Question 2

What is the function of muscle A?

Answer 2

1. Abductor of arm (beyond initial 15º achieved by supraspinatus)
2. Flexion of arm (clavicular fibres)
3. Extension of arm (posterior fibres)

A - Deltoid

Question 3

What is the function of muscle A?

Answer 3

Lateral rotation of arm (at glenohumeral joint)

A - Teres minor

N.b the teres minor is a rotator cuff muscle

Question 4

Name muscle A

Answer 4

A - Infraspinatus

Question 5

Name muscle A

Answer 5

A - Trapezius

Question 6

Name muscle A

Answer 6

A - Teres major

Question 7

Name muscle A

Answer 7

A - Levator scapulae

Question 8

What is the function of muscle A?

Answer 8

1. Medial rotation of arm (at glenohumeral joint)
2. Extension of arm (at glenohumeral joint)

A - Teres major

Question 9

What is the innervation of muscle A?

Answer 9

Axillary nerve (C5 and C6)

A - Deltoid

Question 10

What is the function of muscle A?

Answer 10

1. Extension of forearm (at elbow joint)
2. Adduction of arm (at glenohumeral joint)
3. Extension of arm (at glenohumeral joint)

A - Long head of triceps brachii

Question 11

What is the innervation of muscles A and B?

Answer 11

Dorsal scapular nerve (C5 and C6)

A - Rhomboid minor

B - Rhomboid major

Question 12

What are the spaces A, B and C?

Answer 12

A - Triangular space

B - Quadrangular space

C - Trianglular interval

Question 13

Name nerve A

Answer 13

A - Accessory nerve (XI)

Question 14

What is the innervation of muscle A?

Answer 14

Accessory nerve (XI) - Motor

Anterior rami of C3 and C4 - Sensory

A - Trapezius

Question 15

Name nerve A

Answer 15

A - Axillary nerve

Question 16

What is the function of muscle A?

Answer 16

Initiation of abduction of arm to 15º (at glenohumeral joint)

A - Supraspinatus

N.b the supraspinatus is a rotator cuff muscle

Question 17

What is the function of muscle A?

Answer 17

Elevation of scapula

A - Levator scapulae

Question 18

Name muscles A to D

Answer 18

A - Infraspinatus

B - Supraspinatus

C - Subscapularis

D - Teres minor

Question 19

Name muscle A

Answer 19

A - Teres minor

Question 20

What is the innervation of muscle A?

Answer 20

Inferior subscapular nerve (C5, C6 and C7)

A - Teres major

Question 21

What is the function of muscle A?

Answer 21

1. Elevation scapula
2. Retraction of scapula

A - Rhomboid minor

Question 22

What is the innervation of muscle A?

Answer 22

Axillary nerve

A - Teres minor

Question 23

What is the function of muscle A?

Answer 23

1. Elevation of scapula
2. Retraction of scapula

A - Rhomboid major

Question 24

What is the function of muscle A?

Answer 24

1. Elevator of scapula
2. Rotator of scapula (during abduction of humerus above horizontal)
3. Retraction of scapula (middle fibres)
4. Depress scapula (lower fibres)

A - Trapezius

Question 25

Name muscles A and B

Answer 25

A - Rhomboid minor

B - Rhomboid major

Question 26

Name muscles A and B

Answer 26

A - Levator scapulae

B - Trapezius

Question 27

What is the innervation of muscle A?

Answer 27

Radial nerve (C6, C7 and C8)

A - Long head of triceps brachii

Question 28

What is the function of muscle A?

Answer 28

Lateral rotation of arm (at glenohumeral joint)

A - Infraspinatus

N.b the infraspinatus is a rotator cuff muscle

Question 29

What is the innervation of muscle A?

Answer 29

Suprascapular nerve (C5 and C6)

A - Supraspinatus

Question 30

Name muscle A

Answer 30

A - Deltoid

Question 31

What is the innervation of muscle A?

Answer 31

Suprascapular nerve (C5 and C6)

A - Infraspinatus

Question 32

What is the innervation of muscle A?

Answer 32

Anterior rami of C3 and C4

Braches of dorsal scapular nerve

A - Levator scapulae

Question 33

Name muscle A

Answer 33

A - Supraspinatus