Scapular Region and Shoulder Joint

Question 1

Origin of deltoid

Answer 1

spine and acromion of scapula, lateral third of clavicle

Question 2

what are the true rotator cuff muscles?

Answer 2

supraspinatus, infraspinatus, subscapularis, teres minor

Question 3

insertion of deltoid

Answer 3

deltoid tuberosity of humerus

Question 4

action of anterior, middle and posterior deltoid

Answer 4

anterior: flexion, medial rotation middle: abduction from 15-90 degrees posterior: extension and lateral rotation

Question 5

innervation of deltoid

Answer 5

axillary nerve (C5-6)

Question 6

origin of teres major

Answer 6

inferior angle of scapula

Question 7

insertion of teres major

Answer 7

medial lip of the intertubercular sulcus of humerus

Question 8

action of teres major

Answer 8

adduction, medial rotation of humerus

Question 9

innervation of teres major

Answer 9

lower subscapular nerve (c5-C6)

Question 10

origin of subscapularis

Answer 10

subscapular fossa

Question 11

insertion of subscapularis

Answer 11

lesser tubercle of humerus **is the only muscle attached to this)

Question 12

action of subscapularis

Answer 12

medial rotation of humerus

Question 13

innervation of subscapularis

Answer 13

upper and lower subscapularis nerves (c5, C6, c7)

Question 14

what is another name for the middle subscapular nerve?

Answer 14

thoracodorsal nerve

Question 15

origin of teres minor?

Answer 15

lateral border of scapula

Question 16

insertion of teres minor

Answer 16

inferior facet of greater tubercle

Question 17

action of teres minor

Answer 17

lateral rotation, adduction, extension of humerus

Question 18

innervation of teres minor

Answer 18

axillary nerve (C5, c6)

Question 19

origin of infraspinatus

Answer 19

infraspinous fossa of scapula

Question 20

insertion of infraspinatus

Answer 20

middle facet of greater tubercle

Question 21

action of infraspinatus

Answer 21

lateral rotation of humerus

Question 22

innervation of infraspinatus

Answer 22

suprascapular nerve (C5, c6)

Question 23

origin of supraspinatus

Answer 23

supraspinous fossa of scapula

Question 24

insertion of supraspinatus

Answer 24

upper facet of greater tubercle

Question 25

action of supraspinatus

Answer 25

abduction of humerus from 0-15degrees

Question 26

innervation of supraspinatus

Answer 26

suprascapular nerve (c4, C5, c6)

Question 27

what are the positions of the suprascapular artery and nerve relative to the superior transverse scapular ligament?

Answer 27

suprascapular artery goes above the ligament, suprascapular nerve goes below the ligament

Question 28

type of joints between sternoclavicular, acromioclavicular and glenohumeral joints?

Answer 28

synovial

Question 29

what kind of joint is the scapulothoracic joint?

Answer 29

physiologic joint (non synovial joint)

Question 30

Answer 30

Question 31

Answer 31

Question 32

what ligaments are associated with the acromioclavicular joint?

Answer 32

acromioclavicular liagment, coracoacromial ligament, coracoclavicular ligament consisting of the trapezoid ligament and the conoid ligament

Question 33

what joint is commonly associated with a “shoulder separation”?

Answer 33

acromioclavicular joint

Question 34

what is the joint that usually is fractured if there is a “clavicular fracture”

Answer 34

the sternoclavicular, because there is no where else for the stress to go

Question 35

what comprises the glenohumeral joint?

Answer 35

the head of the humerus and the glenoid cavity of the scapula

Question 36

Answer 36

Question 37

Answer 37

Question 38

Answer 38

Question 39

Answer 39

Question 40

Answer 40

Question 41

Answer 41

Question 42

what is the most common bursitis in the shoulder?

Answer 42

subacromial bursa gets impinged between acromion and supraspinatus tendon

dx: US or MRI
tx: corticosteroid injections

Question 43

what damage can the dislocation of the glenohumeral joint cause?

Answer 43

damage to the glenoid labrum, ligaments supporting the GH joint, nerves crossing the GH joint (axillary, radial), tendons crossing the GH joint (supraspinatus)

*most likely will damage the supraspinatus*

Question 44

Answer 44

Question 45

what is the difference between a shoulder dislocation and shoulder separation?

Answer 45

a dislocation is the disarticulation of the glenohumeral joint

a separation is when the acromioclavicular joint is disarticulated

Question 46

what muscle abducts the arm from 0-15degrees?

Answer 46

supraspinatus

Question 47

what muscle abducts the arm from 15-90 degrees?

Answer 47

deltoid

Question 48

what muscle abducts the arm more than 90 degrees?

Answer 48

serratus anterior, via superior rotation of the glenous fossa