Upper MSK Anatomy

Question 1

How is glenohumeral joint formed?

Answer 1

articulation between glenoid fossa of scapula + humerus

Question 2

What are the 2 main articulations of the scapula?

Answer 2

glenohumeral joint

acromioclavicular joint

Question 3

What are the 4 rotator cuff muscles?

Answer 3

subscapularis
supraspinatus
infraspinatus
teres minor

Question 4

Where does the subscapularis muscle insert from and end?

Answer 4

originates: subscapular fossa

insertion: lesser humeral tuberosity

Question 5

Where does the supraspinatus muscle insert from and end?

Answer 5

originates: supraspinous fossa of the scapula

insertion: greater tubercle of the humerus

Question 6

Where does the infraspinatus muscle insert from and end?

Answer 6

originates: infraspinous fossa of the scapula

insertion: greater tubercle of the humerus

Question 7

Where does teres minor muscle insert from and end?

Answer 7

originates: posterior surface of the scapula, adjacent to its lateral border. It attaches to the greater tubercle of the humerus.

Question 8

Which rotator cuff muscles laterally rotate the arm?

Answer 8

Teres minor
Infraspinatus

Question 9

Which rotator cuff muscle medially rotates the arm?

Answer 9

Subscapularis

Question 10

Which rotator cuff muscle abducts the upper limb at the shoulder?

Answer 10

Supraspinatus

Question 11

What rotator cuff muscles are innervated by the suprascapular nerve?

Answer 11

Supraspinatus
Infraspinatus

Question 12

What rotator cuff muscle is innervated by the subscapular nerves?

Answer 12

Subscapularis

Question 13

What rotator cuff muscle is innervated by the axillary nerve?

Answer 13

Teres minor

Question 14

What are the 3 deep extrinsic shoulder muscles?

Answer 14

Levator scapulae
Rhomboid major and minor

Question 15

What are the 2 superficial extrinsic shoulder muscles?

Answer 15

Trapezius
Latissimus dorsi

Question 16

What innervates the trapezius and where does it arise from?

Answer 16

C7-T12
originate: skull
insert: clavicle, acromion, scapular spine
innervation: accessory nerve

Question 17

What innervates the latissimus dorsi?

Answer 17

thoracodorsal nerve

Question 18

What innervates levator scapulae?

Answer 18

dorsal scapular nerve

Question 19

What innervates rhomboids?

Answer 19

dorsal scapular nerve

Question 20

What specific action is performed by the middle fibers of the trapezius muscle at the shoulder girdle?

Answer 20

Scapula retraction

upper fibres - elevate the scapula and rotates it during abduction of the arm
middle fibres - retract the scapula
lower fibres - pull the scapula inferiorly.

Question 21

A amateur shotput thrower is seen in ED with shoulder pain and weakness. Torn anterior deltoid fibres are seen on ultrasound imaging.

What movement would be most affected?

Question 22

What are the 6 intrinsic shoulder muscles?

Answer 22

deltoid
Teres major
4 rotator cuff muscles - supraspinatus, infraspinatus, teres minor, subscapularis

Question 23

Whata re the 3 muscles of anterior compartment>

Answer 23

Biceps brachii
Brachialis
Coracobrachialis