Shoulder and Pectoral Region

Question 1

Proximal Attachment of deltoid

Answer 1

lateral clavicle, acromion, and spine of scapula

Question 2

Distal Attachment of deltoid

Answer 2

deltoid tuberosity of humerus

Question 3

inn. of deltoid

Answer 3

axillary n (C5-C6)

Question 4

action of deltoid

Answer 4

abduct arm
ant- flex and medial rotation of arm
mid part- abduct arm 15-90 degrees
post- extend and laterally rotate arm

Question 5

proximal attachment of teres major

Answer 5

inferior angle of scapula

Question 6

distal attachment of teres major

Answer 6

intertubercular sulcus of humerus

Question 7

inn. of teres major

Answer 7

lower subscapular n (C6)

Question 8

action of teres major

Answer 8

extend arm, assist in adduction and medial rotation of arm

Question 9

proximal attachment of supraspinatus

Answer 9

supraspinous fossa of scapula

Question 10

distal attachment of supraspinatus, infraspinatus, teres minor

Answer 10

greater tubercle of humerus

Question 11

inn of supraspinatus, infraspinatus

Answer 11

suprascapular n (C4-C6)

Question 12

action of supraspinatus

Answer 12

abduct arm 0-15 degrees, acts with rotator cuff muscles

Question 13

proximal attachment of infraspinatus

Answer 13

infraspinatus fossa of scapula

Question 14

action of infraspinatus

Answer 14

laterally rotate arm, acts with rotator cuff

Question 15

proximal attachment of the teres minor

Answer 15

lateral border of the scapula

Question 16

inn. of the teres minor

Answer 16

axillary n. (C5-C6)

Question 17

action of teres minor

Answer 17

laterally rotate and extend arm, acts with rotator cuff muscles

Question 18

proximal attachment of subscapularis

Answer 18

subscapular fossa

Question 19

distal attachment of subscapularis

Answer 19

lesser tubercle of humerus

Question 20

inn. of subscapularis

Answer 20

upper and lower subscapularis n (C5-C6)

Question 21

action of subscapularis

Answer 21

medially rotate arm, helps hold head of humerus in glenoid cavity

Question 22

proximal attachment of posterior triceps brachii

Answer 22

long- infraglenoid tubercle of scapula
lateral- posterolateral humerus proximal to radial groove
medial- posterior humerus distal to radial groove

Question 23

distal attachment of posterior triceps brachii

Answer 23

proximal olecranon process of ulna

Question 24

inn. of posterior triceps brachii

Answer 24

radial n

Question 25

action of posterior triceps brachii

Answer 25

chief forearm extensor (long head resists humoral dislocation)

Question 26

What are the glenohumeral ligaments

Answer 26

superior, middle, inferior (anterior and posterior inferior)

Question 27

purpose of the glenohumeral ligaments

Answer 27

resist excessive translation and rotation movement

Question 28

where is coracohumeral joint

Answer 28

from coracoid process base to greater tubercle of humerus

Question 29

location of transverse humeral ligament

Answer 29

create a canal for tendon of biceps brachii long head

Question 30

where is the transverse humeral ligament

Answer 30

bridges intertubercular sulcus

Question 31

what is the coracoaromial arch

Answer 31

coracoid process + acromion + coracoacromial ligament superior to humeral head, upper boundary of subacromial space

Question 32

function of coracoacromial arch

Answer 32

prevent superior displacement

Question 33

subacromial bursa

Answer 33

synovial sac to reduce friction, inferior to arch and covers tendon of supraspinatus

Question 34

function of rotator cuff muscles

Answer 34

part of dynamic stabilization around glenohumeral joint

Question 35

function of acromioclavicular ligament

Answer 35

anterior to posterior stability and axial stability

Question 36

function of coracoclavicular ligament

Answer 36

vertical stability for clavicle divided into concord and trapezoid ligaments

Question 37

only true attachment of appendicular to axial skeleton

Answer 37

sternoclavicular joint

Question 38

function of sternoclavicular ligaments (ant. and post.)

Answer 38

stabilize joint capsule there

Question 39

function of costoclavicular ligament

Answer 39

strongest ligament resists elevation of pectoral girdle

Question 40

function of interclavicular ligament

Answer 40

connects medial ends of each clavicle

Question 41

rotator cuff muscles

Answer 41

supraspinatus, infraspinatus, teres minor, subscapularis

Question 42

quadrangular space components

Answer 42

long head, triceps brachii (medial) humeral surgical neck (lateral) , teres minor (superior) , teres major (inferior)

Question 43

triceps interval

Answer 43

long head, triceps brachii (medial, humeral shaft (lateral), teres major (base/superior)

Question 44

quadrangular space contents

Answer 44

axillary n and posterior humeral circumflex a

Question 45

triceps interval contents

Answer 45

radial n and deep brachial a

Question 46

triangular space

Answer 46

long head, triceps brachii (base/lateral), teres minor (superior), teres major (inferior)

Question 47

triangular space contents

Answer 47

circumflex scapular a

Question 48

what is the labrum

Answer 48

fibrocartilage that deepens the glenoid cavity

Question 49

what is the function of the labrum

Answer 49

prevents subluxation of humerus and allows attachment of capsuloligamentous structures

Question 50

what is the function of the coracoacromial ligament

Answer 50

prevents ROM from going beyond a certain point

Question 51

60 degrees of arm abduction motion is due to

Answer 51

rotation of scapula

Question 52

120 degrees of arm abduction motion is due to

Answer 52

rotation of humerus at the shoulder joint