Pectoral Girdle Flashcards
Which 2 bones contribute to the pectoral girdle?
Clavicle (2)
Scapula (2)
What type of joint is the shoulder?
Ball and Socket Synovial
The sternal end of the clavicle forms which joint?
Sternoclavicular
Why is the clavicle the most frequently fractured bone in the body?
Because it is very superficial and just beneath the skin.
The Acromioclavicular (AC) joint is formed by which articulation?
Acromial end of the clavicle and the acromion process of the scapula
Describe the shape of the clavicle.
Medially convex anteriorly ,
Laterally concave anteriorly,
smooth superiorly
On which portion of the clavicle does fracture generally occur?
Occurs in the middle third at the junction of the medial and lateral curves. (medially very stable)
What are some functions of the clavicle?
- Passage way between the neck and arm
- Shock absorber from upper limb to the axial skeleton
- Allows scapular to move on the thoracic wall (scapulothoracic joint)
What is the function of the articular disc of the Sternoclavicular joint?
Cushion impact and improve the fit of the articulation
What type of joint is the sternoclavicular joint?
Saddle Joint (biaxial)
Which 2 structure allow for movement of the later clavicle?
Subclavis muscle and the costoclavicular ligament
Which ribs does the scapula overlie?
2-7
How is the scapula held in place?
Strictly by muscles, no bony articulation.
What type of joint is the Acromioclavicular joint? Which ligament supports this joint?
synovial gliding joint,
Acromioclavicular ligament
What is the anatomical name of a separated shoulder?
Acromioclavicular separation
