KIN 100 - Bones and Joints of the Pectoral Girdle (lecture 4)

Question 1

What does the pectoral girdle refer to

Answer 1

the scapula and clavicle and is part of the appendicular skeleton

Question 2

What does the clavicle connect

Answer 2

the upper limb to the trunk

Question 3

What does the clavicle articulate with medially and laterally

Answer 3

articulates with the manubrium of the sternum medially

also articulates with the acromion of the scapula laterally

Question 4

Describe the concavity of the medial and lateral half of the clavicle

Answer 4

Medial half of the bone is convex anteriorly

Lateral half of the bone is concave anteriorly

Question 5

Describe the surface of the superior and inferior surface of the clavicle

Answer 5

Superior surface is smooth
Inferior surface is rough

Question 6

What does the acromion of the scapula articulate with

Answer 6

the lateral end of the clavicle

Question 7

What does the head of the humerus articulate with

Answer 7

the glenoid fossa of the scapula

Question 8

Describe intrinsic ligaments

Answer 8

thickenings of portions of the joint capsule

Question 9

Describe extrinsic ligaments

Answer 9

provide support to a joint but are located some distance away from the joint capsule

Question 10

Describe the attachment of the sternoclavicular joint

Answer 10

sternal end of the clavicle articulates with the manubrium of the sternum

Question 11

Structurally the sternoclavicular joint is classified as what

Answer 11

as a saddle joint

Question 12

Functionally the sternoclavicular joint is classified as what,

Answer 12

Functionally ball and socket joint

Question 13

Intrinsic ligaments of the sternoclavicular joint (2)

Answer 13

1. Anterior sternoclavicular ligament
2. Posterior sternoclavicular ligament

Question 14

Extrinsic ligaments of the sternoclavicular joint (2)

Answer 14

1. Interclavicular ligament
2. Costoclavicular ligament

Question 15

What does the acromioclavicular joint attach

Answer 15

Acromion f the scapula articulates with the acromial end of the clavicle

Question 16

What synovial joint is the acromioclavicular joint

Answer 16

plane joint

Question 17

Intrinsic ligaments of the acromioclavicular joint (1)

Answer 17

Acromioclavicular ligament

Question 18

Extrinsic ligaments of the acromioclavicular joint (2)

Answer 18

1. Coracoclavicular ligament
   - Conoid ligament
   - Trapezoid ligament

Question 19

What synovial joint is the glenohumeral joint

Answer 19

ball and socket

Question 20

What deepens the glenoid cavity of the glenohumeral joint

Answer 20

glenoid labrum

Question 21

Intrinsic ligaments of the glenohumeral joint (3)

Answer 21

1. Glenohumeral ligaments (Superior, Middle, Inferior)
2. Coracohumeral ligament
3. Transverse humeral ligament

Question 22

Extrinsic ligaments of the glenohumeral joint (1)

Answer 22

Coracoacromial ligament

Question 23

Does the scapula have any attachment to the rib cage

Answer 23

no direct attachment
- However there is scapulothoracic joint that is known as a physiological joint (functionally)

Question 24

Describe how different joints contribute to the scapulohumeral rhythm

Answer 24

For every 3 degree rotation ,
2 degree come from glenohumeral joint
1 degree comes from scapulothoracic joint

Question 25

Describe the movements of the sternoclavicular joint

Answer 25

• abduction of the arm (clavicle elevates to 60 degrees)
• Protraction/retraction of scapula (lateral end of clavicle swings anteriorly and posteriorly)
• flexion of the arm (clavicle rotates on its own axis)

Question 26

What muscles assist in maintaining shoulder joint stability

Answer 26

rotator cuff muscles

Question 27

What does the joint capsule of the glenohumeral joint allow

Answer 27

full abduction of the arm

Question 28

What is involved in shoulder separation

Answer 28

Dislocation of the glenohumoral joint

Question 29

What is involved in shoulder dislocation

Answer 29

dislocation of the glenohumeral joint