The Pectoral Girdle Flashcards
What does the pectoral girdle consist of?
- Clavicle
- Acromion
- Scapula
Another word for Arm/Forearm/Hand
Brachium/Antebrachium/Manus
Characteristics of a conceptual joint
- Not attached to anything
- No cartilage involved (hydrated)
- Allows sliding
What is the superior part of the sternum?
Manubrium
Movement of scapula (protract/retract)
When the scapula protracts, it abducts. When it retracts, it adducts.
What is the clavicle?
A sinuous, long bone largely subcutaneous, forming a strut (holds scapula outwards) between the manubrium and acromial process of the scapula
What is the scapula?
A triangular, flatbone covering the postero-lateral surface of ribs 2-7
What does the spine of the scapula separate?
It separates the suprasinous fossa and the infraspinous fossa. The lateral end of the spine forms the acromial process.
Where is the coracoid process?
It is found under the lateral part of the clavicle
What are the characteristics of glenoid fossa?
It articulates with the head of the humerus at the glenohumeral joint. (Forms the ball and socket joint)
What is the Sternoclavicular (SC) joint and what are its components?
- A saddle-shaped synovial joint between the medial end of the clavicle and the manubrium.
- It has two cavities that are split by fibrocartilaginous intra-articular discs (Meniscus) - maintains stability
- The four components are the Anterior/Posterior sternoclavicular ligament (allows movement distally and the pos is stronger than ant), The interclavicular ligament (stops separation of joints) and the costoclavicular ligament.
What is the Acromioclavicular joint (AC) joint and what are its components?
- A synovial joint between the distal end of the clavicle and the medial border of the acromion.
- It has a wedged-shaped fibrocartilaginous intra-articular disc.
- It is strengthened by the coracoclavicular ligaments (Conoid and trapezoid) - strong
- It has an acromioclavicular ligament
