Bones of the Shoulder Girdle

Question 1

What are the bones of the shoulder girdle?

Answer 1

1. Clavicle
2. Scapula
3. Humerus

Question 2

What are some basic features of the Clavicle?

Answer 2

1. It’s a long bone
2. The only bone to connect the upper limb to the axial skeleton
3. It acts as a strut to hold the upper limb away from the trunk for max range of motion
4. It articulates at the acromioclavicular (AC) and sternoclavicular (SC) joints

Question 3

Identify in the following image, where the bone concaves and convex.

Answer 3

The medial (sternal end) convex anteriorly - the medial ⅔ of the bone.

The lateral (acromial end) concaves anteriorly, lateral third of the bone

Question 4

Label the anterior components of the scapulae and cross-check with the image. Start from the top and rock clockwise.

Answer 4

1. Suprascapular Notch
2. Superior Border
3. Superior Angle
4. Medial Border
5. Inferior Angle
6. Lateral border
7. Lateral Angle
8. Glenoid Cavity
9. Acromion
10. Coracoid Process
11. Subscapular fossa

Question 5

Now, identify the additional posterior components in the Scapula

Answer 5

1. Spine
2. Supraspinous Fossa
3. Infraspinous fossa

Question 6

Where does the clavicle articulate?

Answer 6

It articulates at the acromioclavicular (AC) and sternoclavicular (SC) joints

Question 7

Identify the following bone and the view of the bone. How can you tell?

Answer 7

This is the superior view of the Clavicle. You can tell by the smooth surface of the bone.

Question 8

Label the components of the clavicle and check with the image below.

Answer 8

1. The sternal and acromial ends of the clavicle
2. At the sternal end is the Sternal Articulating Surface
3. At the acromial end is the acromial articulating surface
4. Along the body is the shaft of the clavicle
5. There is the groove where the subclavius muscle attaches (inferior side)
6. Conoid tubercle (small protrusion)
7. Impression for the costoclavicular ligament

Question 9

Consider the image and identify the two processes and what they are for.

Answer 9

1. The is the acromial process which participates in the acromioclavicular joint
   
   1. There is the coracoid process which is for ligament and muscle attachment.