PTH 151 - Unit 5 Lab #1A - UE Joints

The ball-and-socket joint connecting the humerus (arm bone) to the scapula (shoulder blade).

A thick band of tissue that strengthens the front of the shoulder joint, helping to prevent upward dislocation.

A thickened portion of the joint capsule, also located on the front of the shoulder joint.

A ligament that reinforces the front and bottom of the shoulder joint, preventing downward dislocation.

Connects the coracoid process (a bony projection on the scapula) to the greater tubercle (a bump on the humerus).

A ring of cartilage that deepens the glenoid fossa (the socket of the shoulder joint), providing greater stability.

A fluid-filled sac located between the acromion process (a bony projection on the scapula) and the supraspinatus tendon.

Connects the coracoid process to the acromion process, forming a protective arch over the shoulder joint.

The bony protective structure formed by the coracoid process and the acromion process, covered by the coracoacromial ligament.

The shoulder joint allows for a wide range of movements: Flexion/Extension, Abduction/Adduction, Internal/External Rotation.

The only joint that connects the upper extremity to the axial skeleton. Formed between the medial end of the clavicle and the manubrium of the sternum.

A ligament that reinforces the front portion of the sternoclavicular joint capsule.

A ligament that reinforces the back portion of the sternoclavicular joint capsule.

A ligament that connects the medial ends of both clavicles, helping to stabilize the joint.

A ligament that runs from the first rib to the inferior portion of the clavicle, providing support for the joint.

The joint formed between the acromion process of the scapula and the lateral end of the clavicle. Provides mobility for the scapula.

A ligament that reinforces the AC joint, attaching the acromium to the clavicle.

A ligament that connects the coracoid process of the scapula to the clavicle, providing crucial stability for the joint.

One part of the Coracoclavicular ligament located slightly anterior and lateral. Helps to support the shoulder joint.

One part of the Coracoclavicular ligament located slightly posterior and medial. Helps to support the shoulder joint.

The articulation between the posterior aspect of the rib cage and the anterior aspect of the scapula. It's a pseudojoint, meaning it lacks the features of a true synovial joint.

The ST joint allows for several movements including: elevation/depression, upward/downward rotation, anterior/posterior tipping, internal/external rotation, and adduction/abduction (protraction/retraction).

The coordinated movement between the GH joint and the ST joint during shoulder elevation. For every 2 degrees of GH joint elevation, there's 1 degree of upward rotation at the ST joint.

The 2:1 ratio of GH to ST movement is not strictly followed in the initial stages of shoulder elevation (0-30 degrees).

After 30-60 degrees of shoulder elevation, the scapula stabilizes, and the 2:1 ratio is more consistently maintained.

The articulation between the clavicle and the sternum. It plays a vital role in shoulder movement, acting as a stable base for the clavicle.

The SC joint helps regulate the overall movement of the scapula, contributing to its position and stability during scapulohumeral rhythm.

The articulation between the acromion process of the scapula and the clavicle. It helps control the upward and downward rotation of the scapula.

The AC joint contributes to the smooth flow of the scapulohumeral rhythm by regulating the upward and downward rotation of the scapula.

The ST joint's motion is crucial for achieving full range of motion at the GH joint. If the ST joint doesn't move, the GH joint won't be able to reach its full potential.