Shoulder/ Upper Arm Muscles

Front 1

Origin of Deltoid

Back 1

Inferior edge of the crest of the spine of the scapula, lateral margin of the acromion, anterior border of lateral one-third of clavicle

Front 2

Insertion of Deltoid

Back 2

Deltoid tuberosity of humerus

Front 3

Innervation of Deltoid

Back 3

Axillary nerve [C5, C6]

Front 4

Action of Deltoid

Back 4

Major abductor of arm (abducts arm beyond initial 15° done by supraspinatus); clavicular fibers assist in flexing the arm; posterior fibers assist in extending the arm

Front 5

Blood supply of Deltoid

Back 5

Deltoid branch of thoracoacromial artery

Posterior humeral circumflex artery

Front 6

Origin of Supraspinatus

Back 6

Medial two-thirds of the supraspinous fossa of the scapula and the deep fascia that covers the muscle

Front 7

Insertion of Supraspinatus

Back 7

Most superior facet on the greater tubercle of the humerus

Front 8

Innervation of Supraspinatus

Back 8

Suprascapular nerve [C5, C6]

Front 9

Action of Supraspinatus

Back 9

Rotator cuff muscle; initiation of abduction of arm to 15° at glenohumeral joint

Front 10

Blood supply of Supraspinatus

Back 10

Suprascapular artery

Front 11

Origin of Infraspinatus

Back 11

Medial two-thirds of the infraspinous fossa of the scapula and the deep fascia that covers the muscle

Front 12

Inserion Infraspinatus

Back 12

Middle facet on posterior surface of the greater tubercle of the humerus

Front 13

Innervation of Infraspinatus

Back 13

Suprascapular nerve [C5, C6]

Front 14

Action of Infraspinatus

Back 14

Rotator cuff muscle; lateral rotation of arm at the glenohumeral joint

Front 15

Blood supply of Infraspinatus

Back 15

Suprascapular artery & scapular circumflex artery

Front 16

Origin of Teres minor

Back 16

Upper two-thirds of a flattened strip of bone on the posterior surface of the scapula immediately adjacent to the lateral border of the scapula

Front 17

Insertion of Teres minor

Back 17

Inferior facet on the posterior surface of the greater tubercle of the humerus

Front 18

Innervation of Teres minor

Back 18

Axillary nerve [C5, C6]

Front 19

Action of Teres minor

Back 19

Rotator cuff muscle; lateral rotation of arm at the glenohumeral joint

Front 20

Blood supply of Teres minor

Back 20

Scapular circumflex

Front 21

Origin of Teres major

Back 21

Elongate oval area on the posterior surface of the inferiorangle of the scapula

Front 22

Insertion of Teres major

Back 22

Medial lip of the intertubercular sulcus on the anterior surface of the humerus

Front 23

Innervation of Teres major

Back 23

Inferior subscapular nerve [C5, C6, C7]

Front 24

Action of Teres major

Back 24

Medial rotation and extension of the arm at the glenohumeral joint

Front 25

Blood supply of Teres major

Back 25

Circumflex scapular artery

Front 26

Origin of Long head of triceps brachii

Back 26

Infraglenoid tubercle on scapula

Front 27

Insertion of Long head of triceps brachii

Back 27

Common tendon of insertion with medial and lateral heads on the olecranon process of ulna

Front 28

Innervation of Long head of triceps brachii

Back 28

Radial nerve [C6, C7, C8]

Front 29

Action of Long head of triceps brachii

Back 29

Extension of the forearm at the elbow joint; accessory adductor and extensor of the arm at the glenohumeral joint

Front 30

origin of Subscapularis

Back 30

Medial two-thirds of subscapular fossa

Front 31

Insertion of Subscapularis

Back 31

Lesser tubercle of humerus

Front 32

Innervation of Subscapularis

Back 32

Upper and lower subscapular nerves [C5, C6, (C7)]

Front 33

Action of Subscapularis

Back 33

Rotator cuff muscle; medial rotation of the arm at the glenohumeral joint

Front 34

Blood supply of Subscapularis

Back 34

Subscapular artery