Shoulder

Question 1

Compartments

Answer 1

Extrinsic - superficial + deep
Intrinsic - rotator cuff + other

Extrinsic = originate from torso and attach to bones of the shoulder
Intrinsic = originate from scapula/clavicle and attach to humerus

Question 2

Extrinsic superficial muscles

Answer 2

Trapezius

Latissimus dorsi

Question 3

Trapezius

Origin

Answer 3

Skull, nuchal ligament + spinal processes of C3-4

Question 4

Trapezius

Insertion

Answer 4

Clavicle, acromion and scapula spine

Question 5

Trapezius

Innervation

Answer 5

Motor = accessory nerve
Sensory = C3/4 spinal nerves

Question 6

Trapezius

Function

Answer 6

Upper fibres = elevate/rotate scapula during abduction
Middle fibres = retract scapula
Lower fibres = pull scapula inferiorally

Question 7

Latissimus dorsi

Origin

Answer 7

Spinous processes T6-12 and inferior 3 ribs

Question 8

Latissimus dorsi

Insertion

Answer 8

Intertubercular sulcus of humerus

Question 9

Latissimus dorsi

Innervation

Answer 9

Thoracodorsal nerve

Question 10

Latissimus dorsi

Function

Answer 10

Extends, adducts and medially rotates upper limb

Question 11

Extrinsic deep muscles

Answer 11

Levator scapulae
Rhomboid major
Rhomboid minor

All innervates by dorsal scapular nerve
All insert on the medial border of the scapula

Question 12

Levator scapulae

Origin

Answer 12

Transverse processes of C1-4 vertebrae

Question 13

Levator scapulae

Insertion

Answer 13

Medial border of scapula

Question 14

Levator scapulae

Innervation

Answer 14

Dorsal scapular nerve

Question 15

Levator scapulae

Function

Answer 15

Elevates scapula

Question 16

Rhomboid major

Origin

Answer 16

Spinous processes of T2-5

Question 17

Rhomboid major

Insertion

Answer 17

Medial border of scapula

Question 18

Rhomboid major

Innervation

Answer 18

Dorsal scapular nerve

Question 19

Rhomboid major

Function

Answer 19

Retracts and rotates the scapula

Question 20

Rhomboid minor

Origin

Answer 20

Spinous processes of C7-T1 vertebrae

Question 21

Rhomboid minor

Insertion

Answer 21

Medial border of scapula

Question 22

Rhomboid minor

Innervation

Answer 22

Dorsal scapular nerve

Question 23

Rhomboid minor

Function

Answer 23

Retracts and rotates scapula

Question 24

Intrinsic muscles (non-rotator cuff)

Answer 24

Deltoid

Teres major

Question 25

Deltoid | Origin

Answer 25

Scapula + clavicle

Question 26

Deltoid | Insertion

Answer 26

Deltoid tuberosity on lateral surface of humerus

Question 27

Deltoid | Innervation

Answer 27

Axillary nerve

Question 28

Deltoid | Function

Answer 28

``` Anterior = flex Middle = abductor (0-15 degrees) Posterior = extend ```

Question 29

Teres major | Origin

Answer 29

Posterior surface of inferior angle of scapula

Question 30

Teres major | Insertion

Answer 30

Intertubercular groove of humerus

Question 31

Teres major | Innervation

Answer 31

Lower subscapular nerve

Question 32

Teres major | Function

Answer 32

Adducts | Medially rotates

Question 33

Intrinsic rotator cuff muscles

Answer 33

Supraspinatus Infraspinatus Subscapularis Teres minor Originate from the scapula and attach to humeral head Act to pull the humeral head into the glenoid fossa

Question 34

Supraspinatus | Origin

Answer 34

Supraspinous fossa of the scapula

Question 35

Supraspinatus | Insertion

Answer 35

Greater tubercle of the humerus

Question 36

Supraspinatus | Innervation

Answer 36

Suprascapular nerve

Question 37

Supraspinatus | Function

Answer 37

Abducts the arm 0-15 degrees

Question 38

Infraspinatus | Origin

Answer 38

Infraspinatous fossa of scapula

Question 39

Infraspinatus | Insertion

Answer 39

Less tubercule of the humerus

Question 40

Infraspinatus | Innervation

Answer 40

Suprascapular nerve

Question 41

Infraspinatus | Function

Answer 41

Laterally rotates

Question 42

Subscapularis | Origin

Answer 42

Subscapular fossa of scapula

Question 43

Subscapularis | Insertion

Answer 43

Greater tubercle of the humerus

Question 44

Subscapularis | Innervation

Answer 44

Upper/lower subscapular nerves

Question 45

Subscapularis | Function

Answer 45

Medially rotates

Question 46

Teres minor | Origin

Answer 46

Posterior surface of scapula

Question 47

Teres minor | Insertion

Answer 47

Greater tubercle of the humerus

Question 48

Teres minor | Innervation

Answer 48

Axillary nerve

Question 49

Teres minor | Function

Answer 49

Laterally rotates