Glenohumeral joint: Structure and actions

The video tutorial provides an in-depth look at the glenohumeral joint, a synovial ball and socket joint with the greatest range of motion in the body. It covers the joint's components, including the humerus and glenoid cavity, and discusses its flexibility and stability. The tutorial explains the stabilizing structures like the glenoid labrum, joint capsule, and ligaments, and describes the joint's actions such as flexion, extension, abduction, adduction, and rotation.

What type of joint is the glenohumeral joint?

• Saddle joint

• Hinge joint

• Pivot joint

• Ball and socket joint

Which part of the humerus forms the ball in the glenohumeral joint?

• Tubercle

• Head

• Neck

• Shaft

What analogy is used to describe the glenoid labrum's function?

• A door hinge

• A golf ball on a tee

• A rubber band

• A pulley system

How does the glenoid labrum increase the stability of the glenohumeral joint?

• By reducing the joint's range of motion

• By increasing the depth of the glenoid cavity

• By attaching to the clavicle

• By thickening the joint capsule

What is the primary function of the joint capsule in the glenohumeral joint?

• To prevent bone contact

• To provide a suction effect

• To connect the humerus to the scapula

• To produce synovial fluid

What risk is increased by the axillary fold in the joint capsule?

• Fracture

• Dislocation

• Arthritis

• Inflammation

Which ligament connects the coracoid process to the humerus?

• Coracoclavicular ligament

• Coracoacromial ligament

• Acromioclavicular ligament

• Coracohumeral ligament

What is the role of the coracoacromial ligament?

• To increase joint flexibility

• To attach the biceps tendon

• To stabilize the humeral head within the joint

• To connect the clavicle to the scapula

Which movement involves moving the humerus away from the midline?

• Adduction

• Abduction

• Extension

• Flexion

What is the difference between medial and lateral rotation of the humerus?

• Medial rotation moves the humerus forward, lateral moves it backward

• Medial rotation moves the humerus upward, lateral moves it downward

• Medial rotation moves the humerus across the body, lateral moves it away

• Medial rotation moves the humerus inward, lateral moves it outward