1.4 Shoulder Joints and Pectoral Girdle Anatomy

What type of joint is the sternoclavicular joint?

It is a purely functional joint.

What does the costoclavicular ligament prevent?

It prevents the medial end of the clavicle from displacing superiorly.

What is the role of the interclavicular ligament?

It runs across the superior aspect of the joint and helps improve the range of motion.

What type of joint is the acromioclavicular joint?

It is a synovial plane joint.

What is the primary movement allowed by the sternoclavicular joint?

Anterior-posterior movement of the medial end of the clavicle.

What limits the elevation of the medial end of the clavicle?

Elevation is limited by the interclavicular ligament.

What limits the depression of the medial end of the clavicle?

Depression is limited by the costoclavicular ligament.

What type of joint is the shoulder joint (glenohumeral joint)?

It is a ball and socket joint.

What is the mobility characteristic of the shoulder joint?

It is highly mobile.

What is the function of the articular disc in the acromioclavicular joint?

It reinforces the capsule and aids in joint stability.

What articulates with the medial end of the clavicle?

The manubrium of the sternum.

What articulates with the lateral end of the clavicle?

The acromion of the scapula.

Where does the glenoid fossa of the scapula articulate?

It articulates with the head of the humerus.

What creates a roof above the head of the humerus?

The acromion process of the scapula.

What type of joint is the scapulothoracic joint?

It is not a true joint but functions as a joint through movement of the scapula on the thoracic wall.

What are the main ligaments associated with the sternoclavicular joint?

Anterior sternoclavicular ligament and costoclavicular ligament.