Scapular and Pectoral Region

Question 1

What are the three joints of the shoulder complex?

Answer 1

Sternoclavicular, acromioclavicular, and glenohumeral

Question 2

What is the action of the deltoid muscle?

Answer 2

Abducts humerus (1°), flexes, extends and rotates humerus (2°)

Question 3

What supplies the deltoid muscle?

Answer 3

Axillary nerve and posterior circumflex humeral vessels

Question 4

What is the action of the teres major muscle?

Answer 4

Medially rotates and extends humerus

Question 5

What supplies teres major muscle?

Answer 5

Lower subscapular nerve and subscapular vessels

Question 6

What is the action of the supraspinatus muscle?

Answer 6

Abducts humerus the first 15 degrees

Question 7

What supplies the supraspinatus muscle?

Answer 7

Suprascapular nerve, and vessels and dorsal scapular vessels

Question 8

What is the action of the infraspinatus muscle?

Answer 8

Laterally rotates humerus

Question 9

What supplies the infraspinatus muscle?

Answer 9

Suprascapular nerve, and vessels and subscapular vessels

Question 10

What is the action of the teres minor muscle?

Answer 10

Lateral rotation of humerus

Question 11

What supplies teres minor muscle?

Answer 11

Axillary nerve, and suprascapular and subscapular vessels

Question 12

What is the action of the suprascapular muscle?

Answer 12

Medial rotation of the humerus

Question 13

What supplies the suprascapular muscle?

Answer 13

Upper and lower subscapular nn., and subscapular vessels

Question 14

What are the muscles of the rotator cuff?

Answer 14

SITS, Supraspinatus, infraspinatus, teres minor, and subscapularis

Question 15

What is the subacromial (subdeltoid) bursa?

Answer 15

Membranous sac containing lubricating synovial fluid

Question 16

Where is the subacromial (subdeltoid) bursa located?

Answer 16

Inferior to acromion and deltoid but superior to supraspinatus muscle

Question 17

What is the result of attrition to the spuraspinatus tendon?

Answer 17

The capsule becomes continuous with bursa and is painful and limits shoulder movement

Question 18

What are the three spaces of the shoulder region?

Answer 18

Quadrangular space, triangular space, and triangular interval

Question 19

What passes through the quadrangular space?

Answer 19

Axillary nerve and posterior circumflex humeral artery

Question 20

What passes through the triangular space?

Answer 20

Circumflex scapular artery

Question 21

What passes through the triangular interval?

Answer 21

Radial nerve and profunda brachii artery

Question 22

What is the superior border of the quadrangular space?

Answer 22

Teres minor muscle

Question 23

What is the inferior border of the quadrangular space?

Answer 23

Teres major muscle

Question 24

What is the medial border of the quadrangular space?

Answer 24

Long head of triceps brachii muscle

Question 25

What is the lateral border of the quadrangular space?

Answer 25

Surgical neck of the humerus

Question 26

What is the superior border of the triangular space?

Answer 26

Teres minor muscle

Question 27

What is the inferior border of the triangular space?

Answer 27

Teres major muscle

Question 28

What is the lateral border of the triangular space?

Answer 28

Long head of the triceps brachii muscle

Question 29

What is the superior border of the triangular interval?

Answer 29

Teres major muscle

Question 30

What is the medial border of the triangular interval?

Answer 30

Long head of triceps brachii muscle

Question 31

What is the lateral border of the triangular interval?

Answer 31

Lateral head of the triceps brachii muscle

Question 32

What is the action of pectoralis major muscle?

Answer 32

Adducts and medially rotates humerus

Question 33

What supplies pectoralis major muscle?

Answer 33

Medial and lateral pectoral nn., and thoracoacromial vessels

Question 34

What is the action of pectoralis minor muscle?

Answer 34

Protracts scapular

Question 35

What supplies pectoralis minor muscle?

Answer 35

Medial pectoral nerve and thoracoacromial vessles

Question 36

What are the three main arterial supplies of the pectoral region?

Answer 36

Lateral thoracic (mammary), internal thoracic (mammary), and thoracoacromial arteries

Question 37

The lateral thoracic (mammary) artery supplies what?

Answer 37

Lateral thorax, lateral pectoral region, and lateral breast

Question 38

The internal thoracic (mammary) artery supplies what?

Answer 38

Anterior thorax, median pectoral region, and median breast

Question 39

The thoracoacromial artery sends off what four branches?

Answer 39

Pectoral, clavicular, acromial, and deltoid arteries

Question 40

The pectoral region is innervated by what four nerves?

Answer 40

Cutaneous, median pectoral, lateral pectoral, and long thoracic nerves