Muscles

Question 1

Origin of the deltoid

Answer 1

Lateral third of the clavicle, the acromion and the spine of the scapula.

Question 2

Insertion of the deltoid

Answer 2

Deltoid tuberosity

Question 3

Actions of the deltoid

Answer 3

All fibers abduct the shoulder, anterior fibers also flex, medially rotate and horizontally adduct while posterior fibers also extend, laterally rotate and horizontally abduct the shoulder.

Question 4

Innervation of the deltoid

Answer 4

Axillary nerve

Question 5

Origin of the latissimus dorsi

Answer 5

Inferior angle of the scapula, spinous process of the last 6 thoracic vertebrae, the last 3 or 4 ribs, the thoracolumbar fascia and the posterior surface of the iliac crest.

Question 6

Insertion of the latissimus dorsi

Answer 6

Intertubercular groove of the humerus

Question 7

Actions of latissimus dorsi

Answer 7

Medial rotation, adduction and extension of the shoulder at the glenohumeral joint.

Question 8

Innervation of latissimus dorsi

Answer 8

Thoracodorsal nerve

Question 9

Anatomical name for the shoulder joint

Answer 9

Glenohumeral joint

Question 10

Handcuff muscles

Answer 10

Latissimus dorsi and teres major.

Question 11

Origin of teres major

Answer 11

Inferior angle and lower third of the lateral border of the scapula.

Question 12

Insertion of teres major

Answer 12

Crest of the lesser tubercle of the humerus

Question 13

Actions of teres major

Answer 13

Medially rotates, adducts and extends the shoulder at the glenohumeral joint.

Question 14

Innervation of teres major

Answer 14

Lower subscapular nerve

Question 15

What do rotator cuff muscles have in common?

Answer 15

They all stabilize the head of the humerus in the glenoid cavity.

Question 16

Rotator cuff muscles

Answer 16

Supraspinatus, infraspinatus, teres minor, subscapularis

Question 17

Origin of supraspinatus

Answer 17

Supraspinous fossa of the scapula

Question 18

Insertion of supraspinatus

Answer 18

Greater tubercle of the humerus

Question 19

Actions of supraspinatus

Answer 19

Abduct the shoulder and stabilize the head of the humerus in the glenoid cavity.

Question 20

Innervation of supraspinatus

Answer 20

Suprascapular nerve

Question 21

Origin of infraspinatus

Answer 21

Infraspinous fossa of the scapula

Question 22

Insertion of infraspinatus

Answer 22

Greater tubercle of the humerus

Question 23

Actions of infraspinatus

Answer 23

Laterally rotate the shoulder and stabilize the head of the humerus in the glenoid cavity.

Question 24

Innervation of infraspinatus

Answer 24

Suprascapular nerve

Question 25

Origin of teres minor

Answer 25

Upper two thirds of the lateral border of the scapula.

Question 26

Insertion of teres minor

Answer 26

Greater tubercle of the humerus

Question 27

Actions of teres minor

Answer 27

Laterally rotate and adduct the shoulder, stabilize the head of the humerus in the glenoid cavity.

Question 28

Innervation of teres minor

Answer 28

Axillary nerve

Question 29

Origin of subscapularis

Answer 29

Subscapular fossa

Question 30

Insertion of subscapularis

Answer 30

Lesser tubercle of the humerus

Question 31

Actions of subscapularis

Answer 31

Medially rotate the shoulder, stabilize the head of the humerus in the glenoid cavity.

Question 32

Innervation of subscapularis

Answer 32

Upper and lower subscapular nerves.

Question 33

Origin of biceps brachii

Answer 33

Long head is the suplaglenoid tubercle, short head is the coracoid process of the scapula

Question 34

Insertion of biceps brachii

Answer 34

Tuberosity of the radius and aponeurosis of biceps brachii.

Question 35

Actions of biceps brachii

Answer 35

Flexes the elbow, supinates the forearm and flexes the shoulder.

Question 36

Anatomical name for the elbow

Answer 36

Humeroulnar joint

Question 37

The forearm is pronated and supinated at which joint?

Answer 37

Radioulnar joints

Question 38

Innervation of biceps brachii

Answer 38

Musculocutaneous nerve

Question 39

Origin of triceps brachii

Answer 39

Long head is the infraglenoid tubercle of the scapula, lateral and medial heads are the posterior surface of humerus.

Question 40

Insertion of triceps brachii

Answer 40

Olecranon process of the ulna.

Question 41

Actions of triceps brachii

Answer 41

All heads extend the elbow, the long head also adducts and extends the shoulder.

Question 42

Innervation of triceps brachii

Answer 42

Radial nerve

Question 43

Origin of brachioradialis

Answer 43

Proximal two thirds of the lateral supracondylar ridge of the humerus.

Question 44

Insertion of brachioradialis

Answer 44

Styloid process of the radius

Question 45

Actions of brachioradialis

Answer 45

Flexes the elbow, assists to pronate and supinate the forearm when resisted.

Question 46

Innervation of brachioradialis

Answer 46

Radial nerve

Question 47

Palpation key of biceps brachii

Answer 47

Resist forearm flexion and flexion of the arm for the upper fibers.

Question 48

Palpation key of triceps brachii

Answer 48

Have the client try to extend their arm against their own knee.

Question 49

Palpation key of brachioradialis

Answer 49

Place arm in hitchhiking position and resist flexion at the elbow.

Question 50

Palpation key of teres major

Answer 50

Prone with arm hanging off the side of the table; resist medial rotation.

Question 51

Palpation key of supraspinatus

Answer 51

Resist abduction of the shoulder.

Question 52

Palpation key of infraspinatus

Answer 52

Prone with arm off the side of the table; resist lateral rotation.

Question 53

Palpation key of teres minor

Answer 53

Prone with arm off the side of the table; resist lateral rotation.

Question 54

Palpation key of subscapularis

Answer 54

Supine - client to medially rotate arm (over chest) go in axillary fold (use other hand to protract the scapula)

Question 55

Palpation key of latissimus dorsi

Answer 55

Resist extension of the shoulder; begin at the axilla.

Question 56

Palpation key of deltoid

Answer 56

Resist abduction of the shoulder; add horizontal abduction or adduction for anterior and posterior fibers.