Shoulder Joint Lab

Task: Write a report

Select three joints.

Shoulder Joint (Ball and Socket)
Elbow Joint (Hinge)
Wrist Joint (Condyloid)

Discuss the description of the movement at each joint action for the ideal performance of the over hand volleyball serve.

Ball and Socket:
When preparing for a volleyball serve, the right shoulder joint is primarily used. The shoulder joint is a third class lever operating on the humorous bone, which is held in place by the clavicle bone and scapula. These three bones make up the Ball and Socket joint which consists of a globular head (humerus) that articulates with the cup-shaped cavity of another bone (the scapula). This joint allows a wider range of movement therefore permitting movements in all directions
The movements at the shoulder joint are flexion, extension, abduction, adduction, internal and external rotation and circumduction. After the ball is thrown in the air via my left arm, my the right arm above my head involving extension of the shoulder joint. When the ball begins to fall, I further extend my arm to maximise the motion to therefore apply maximum force to the volleyball. This is then closely followed by a quick flexion of the shoulder joint once my shoulder has reached its full extension in order to smack the volley ball over the net (serve the volleyball). As my shoulder flexes the pectoral’s major contracts. The deltoid is also vital to shoulder movement, during my flexion the anterior deltoid will contract, pulling the humorous and therefore my arm towards my chest. These two
The elbow joint only allows flexion and extension as the movement is possible in one plane only. Also within the elbow joint capsule, the radius articulates with the ulna to form a pivot joint. The radioulnar joint allows pronation and supination of the lower arm which is most useful when performing an over arm volleyball serve. The elbow is again a 3rd class lever in the arm. Operating in conjunction with the shoulder to maximise the force generated in the arm. As the ball is tossed, like the shoulder joint, my elbow moves into a fixed-ready position, moving my elbow into total flexion. As my elbow flexes the biceps contract, pulling the ulna into extension. Although the biceps are only pulling on the ulna, this doesn’t mean the radius isn’t at all involved. The antagonist to the biceps are the triceps which relax during flexion of the elbow joint, allowing my arm to to gain maximum flexion to in turn follow through with extension when my palm comes in contact with the volleyball. As my elbow flexes, my forearm also pivots via the radioulnar joint, allowing my palm to face down (pronation) so that its my palm in contact with the ball rather than the top in my hand. As my palm pronates, the pronator trees contract thus the supinatior muscle relaxes. Because of this, I am able hit the ball with maximum force allowing the ball to fly over the