Anatomy of Shoulder Complex & Upper Arm

Question 1

slender bone about 6 inches long and shaped like the letter S.

Answer 1

clavicle

Question 2

How long is the clavicle

Answer 2

6 inches long

Question 3

Point of weakness & large # of fractures occur in the clavicle

Answer 3

point at which the clavicle changes shape

Question 4

flat, triangular bone

Answer 4

Scapula

Question 5

2 major projections of scapula

Answer 5

1. spine (hook-like projection)
2. coracoid process

Question 6

above the spine of the scapula

Answer 6

supraspinous fossa

Question 7

below the spine of the scapula

Answer 7

infraspinous fossa

Question 8

made up of the head, anatomical neck, greater and lesser tuberosities with a bicipital groove in between
(retains the long tendon of the biceps brachii muscle)

Answer 8

Humerus

Question 9

3 bones that make up the shoulder complex & upper arm

Answer 9

1. clavicle
2. scapula
3. Humerus

Question 10

4 articulations of the shoulder complex & upper arm

Answer 10

1. Sternoclavicular Joint (SC)
2. Acromioclavicular Joint (AC)
3. Coracoclavicular Joint (CC)
4. Glenohumeral Joint (GH)

Question 11

proximal end of clavicle with the manubrium of the sternum.

A fibrocartilaginous disk is interposed between the two surfaces.

The SC joint is very weak in bony arrangement but has very strong ligamentous stability
- anterior sternoclavicular
- posterior sternoclavicular
- interclavicular
- costoclavicular

Answer 11

Sternoclavicular Joint (SC)

Question 12

interposed between proximal end of clavicle w/ the manubrium of the sternum

Answer 12

fibrocartilaginous disk

Question 13

4 ligaments of the Sternoclavicular Joint (SC)

Answer 13

1. Anterior Sternoclavicular
2. Posterior Sternoclavicular
3. Interclavicular
4. costoclavicular

Question 14

prevents upward displacement of clavicle

Answer 14

anterior sternoclavicular

Question 15

prevents upward displacement of clavicle

Answer 15

anterior sternoclavicular ligament
posterior sternoclavicular ligament

Question 16

prevents lateral displacement of clavicle

Answer 16

interclavicular

Question 17

prevents lateral and upward displacement of clavicle

Answer 17

costoclavicular

Question 18

gliding articulation of the lateral end of the clavicle with the acromion process.

A weak joint surrounded by a thin, fibrous sleeve and
3 ligaments:
superior and inferior acromioclavicular
the coracoclavicular ligaments

Answer 18

Acromioclavicular Joint (AC)

Question 19

3 ligaments of the Acromioclavicular Joint (AC)

Answer 19

1. superior acromioclavicular
2. inferior acromioclavicular
3. coracoclavicular

Question 20

the coracoid process with the clavicle joined by the coracoclavicular ligament (divided into the conoid and the trapezoid parts)

Answer 20

coracoclavicular joint (CC)

Question 21

the true shoulder joint. Ball and socket joint made up of the round head of the humerus and the glenoid cavity of the scapula.

A fibrocartilagenous rim known as the glenoid labrum deepens the cavity.

Surrounding the articulation is a loose, articular capsule.

Ligamentous reinforcement comes from the superior, middle, and inferior glenohumeral ligaments and the coracohumeral ligament.

Answer 21

Glenohumeral Joint (GH)

Question 22

Ligamentous reinforcement of the Glenohumeral Joint (GH)

Answer 22

1. Superior glenohumeral ligment
2. middle glenohumeral ligament
3. inferior glenohumeral ligament
4. coracohumeral ligament

Question 23

fibrocartilagenous rim deepens the cavity of the glenohumeral joint (GH)

Answer 23

glenoid labrum

Question 24

True shoulder joint / Ball & socket joint of the glenohumeral joint is made of

Answer 24

1. round head of the humerus
2. glenoid cavity of the scapula

Question 25

5 anterior nerve rami subdivisions create a nerve network known as

Answer 25

Brachial Plexis

Question 26

Brachial Plexis is made of what spinal nerve segments

Answer 26

C5 - T1

Question 27

Does the scapula contribute the first 45 degrees of GH motion

Answer 27

NO

Question 28

Beyond 45 degrees, scapula starts to move in what ratio?

Answer 28

1:2 ratio
1 degree of scapula movement for every 2 degrees of humeral movement

Question 29

Rotator cuff is made of what muscles

Answer 29

1. supraspinatus
2. infraspinatus
3. subscapular
4. teres minor