Pectoral and Intrisic Muscles of the Shoulder

Question 1

Pectoralis major: origin

Answer 1

-clavicle -sternum -costal cartilages of superior ribs

Question 2

Pectoralis major: insertion

Answer 2

anteromedial aspect of proximal humerus

Question 3

Pectoralis major: innervation

Answer 3

-Medial pectoral nerve (C8, T1) -Lateral pectoral nerve (C5,C6, C7)

Question 4

Pectoralis major: action

Answer 4

Glenohumeral joint: -Adduction -Flexion -Medial rotation

Question 5

Pectoralis minor: origin

Answer 5

ribs 3-5

Question 6

Pectoralis minor: insertion

Answer 6

Coracoid process of scapula

Question 7

Pectoralis minor: innvervation

Answer 7

Medial pectoral nerve (C8, T1)

Question 8

Pectoralis minor: action

Answer 8

Scapula: -Protraction -Depression -stabilization

Question 9

Serratus Anterior: origin

Answer 9

lateral aspect of ribs 1-8

Question 10

Serratus Anterior: insertion

Answer 10

Anterior surface of scapula medial border

Question 11

Serratus Anterior: innervation

Answer 11

Long thoracic nerve (C5, C6, C7)

Question 12

Serratus Anterior: action

Answer 12

Scapula: -protraction -Upward rotation -Fixes scapula to thoracic wall

Question 13

Deltoid: origin

Answer 13

-clavicle -acromion -spine of the scapula

Question 14

Deltoid: insertion

Answer 14

Deltoid tuberosity of humerus

Question 15

Deltoid: innervation

Answer 15

axillary nerve (C5, C6)

Question 16

Deltoid: action

Answer 16

anterior: flexion and medial rotation of Glenohumeral joint middle: abduction of glenohumeral joint after 15 degrees posterior: extension and lateral rotation of the glenohumeral joint

Question 17

Teres major: origin

Answer 17

inferior angle of the scapula

Question 18

Teres major: insertion

Answer 18

anteromedial aspect of proximal humerus

Question 19

Teres major: innervation

Answer 19

Lower subscapular (C5, C6)

Question 20

Teres major: action

Answer 20

Glenohumeral joint: -medial rotation -adduction

Question 21

Teres minor: origin

Answer 21

lateral border of scapula

Question 22

Teres minor: insertion

Answer 22

greater tubercle of humerus

Question 23

Teres minor: innervation

Answer 23

Axillary (C5, C6)

Question 24

Teres minor: action

Answer 24

Glenohumeral joint: -lateral rotation -stabilize the glenohumeral joint

Question 25

Supraspinatus: origin

Answer 25

supraspinous fossa of scapula

Question 26

Supraspinatus: insertion

Answer 26

greater tubercle of humerus

Question 27

Supraspinatus: innervation

Answer 27

suprascapular (C5, C6)

Question 28

Supraspinatus: action

Answer 28

Glenohumeral joint: -abduction (initial 15 degrees) -stabilize

Question 29

Infraspinatus: origin

Answer 29

infraspinous fossa of scapula

Question 30

Infraspinatus: insertion

Answer 30

Greater tubercle of humerus

Question 31

Infraspinatus: innervation

Answer 31

suprascapular (C5, C6)

Question 32

Infraspinatus: action

Answer 32

Glenohumeral joint: -lateral rotation -stabilize

Question 33

Subscapularis: origin

Answer 33

subscapular fossa of scapula

Question 34

Subscapularis: insertion

Answer 34

lesser tubercle of humerus

Question 35

Subscapularis: innervation

Answer 35

-Upper subscapular (C5, C6) -Lower subscapular (C5, C6)

Question 36

Subscapularis: action

Answer 36

Glenohumeral joint: -medial rotation -adduction -stabilize