Shoulder

Question 1

Pectoralis major attachments

Answer 1

Sternal half of clavicle, sternum to 7th rib, cartilages of true ribs, aponeurosis of external oblique muscle
Lateral lip of intertubercular sulcus

Question 2

Pectoralis major innervation

Answer 2

Medial and lateral pectoral nerves

Question 3

Pectoralis major blood supply

Answer 3

Pectoral branch of thoraco-acromial artery

Perforating branches of internal thoracic artery

Question 4

Pectoralis major action

Answer 4

Flexes and adducts arm

Rotates arm medially

Question 5

Pectoralis minor attachments

Answer 5

Outer surface of upper margin of ribs 3-5

Coracoid process of scapula

Question 6

Pectoralis minor innervation

Answer 6

Medial pectoral nerve

Question 7

Pectoralis minor blood supply

Answer 7

Pectoral branch of thoraco-acromial artery and intercostal lateral thoracic artery

Question 8

Pectoralis minor action

Answer 8

Lowers lateral angle of scapula and protracts scapula

Question 9

Deltoid attachments

Answer 9

Lateral third of anterior clavicle, lateral acromion, inferior edge of spine of scapula
Deltoid tuberosity of humerus

Question 10

Deltoid innervation

Answer 10

Axillary nerve

Question 11

Deltoid blood supply

Answer 11

Posterior circumflex humeral artery, deltoid branch of thoraco-acromial artery

Question 12

Deltoid action

Answer 12

Clavicular part: flexes and medially rotates arm
Acromial part: abducts arm beyond initial 15 degrees
Spinal part: extends and laterally rotates arm

Question 13

Infraspinatus attachments

Answer 13

Infraspinous fossa of scapula and deep fascia

Middle facet of greater tubercle of humerus

Question 14

Infraspinatus innervation

Answer 14

axillary nerve

Question 15

Infraspinatus blood supply

Answer 15

Suprascapular artery

Question 16

Infraspinatus action

Answer 16

Lateral rotation of arm (with teres minor)

Question 17

Serratus anterior attachments

Answer 17

Lateral surfaces of upper 8-9 ribs

Costal surface of medial border of scapula

Question 18

Serratus anterior innervation

Answer 18

Long thoracic nerve

Question 19

Serratus anterior blood supply

Answer 19

Lateral thoracic artery

Question 20

Serratus anterior action

Answer 20

Protracts and rotates scapula and holds against thoracic wall

Question 21

Subscapularis attachment

Answer 21

Subscapular fossa

Lesser tubercle of humerus

Question 22

Subscapularis innervation

Answer 22

Upper and lower subscapular nerves

Question 23

Subscapularis blood supply

Answer 23

Subscapular artery, lateral thoracic artery

Question 24

Subscapularis action

Answer 24

Medially rotates arm at shoulder and adducts it

Question 25

Supraspinatus attachments

Answer 25

Supraspinous fossa of scapula and deep fascia

Superior facet of greater tubercle of humerus

Question 26

Supraspinatus innervation

Answer 26

Suprascapular nerve

Question 27

Supraspinatus blood supply

Answer 27

Suprascapular artery

Question 28

Supraspinatus action

Answer 28

Initiates arm abduction, acts with rotator cuff muscles

Question 29

Teres major attachments

Answer 29

Posterior surface of inferior angle of scapula

Medial lip of intertubercular sulcus of humerus

Question 30

Teres major innervation

Answer 30

Lower subscapular nerve

Question 31

Teres major blood supply

Answer 31

Circumflex scapular artery

Question 32

Teres major action

Answer 32

Adducts and medially rotates arm

Question 33

Teres minor attachments

Answer 33

Upper 2/3 of posterior surface of lateral border of scapula

Question 34

Teres minor innervation

Answer 34

Axillary nerve

Question 35

Teres minor blood supply

Answer 35

Circumflex scapular artery

Question 36

Teres minor action

Answer 36

Laterally rotates arm