Upper Limb Joints Flashcards

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Questions and Answers

What is the Sternoclavicular (SC) Joint?

The Sternoclavicular Joint is a synovial articulation between the sternal end of the clavicle and the manubrium of the sternum and 1st costal cartilage.

What type of joint is the SC joint?

The Sternoclavicular Joint is a saddle type joint but functions as a ball-and-socket joint.

The SC Joint is divided into two compartments by what?

The Sternoclavicular Joint is divided into two compartments by an articulation disc.

What is the importance of the SC Joint?

The Sternoclavicular Joint is the only articulation between the upper limb and the axial skeleton. Signup and view all the answers

What is the SC Joint supplied by?

Blood Supply: Internal Thoracic Artery, Supra Scapular Artery; Innervation: Branches of the Medial Supraclavicular Nerve, Subclavian nerve. Signup and view all the answers

What ligaments support the SC Joint?

The Anterior and Posterior Sternoclavicular ligaments, Interclavicular ligament, and Costoclavicular ligament. Signup and view all the answers

What is the Acromioclavicular (AC) Joint?

The AC Joint is a joint formed by the articulation of the articular surfaces of the acromial end of the clavicle and the acromion. Signup and view all the answers

What type of joint is the AC Joint?

The AC Joint is a plane synovial articulation. Signup and view all the answers

What lines the internal surface of the fibrous layer of the capsule of the AC Joint?

Synovial Membrane. Signup and view all the answers

By which muscle is the AC Joint strengthened?

The joint capsule is strengthened superiorly by fibres of the Trapezius Muscle. Signup and view all the answers

What strengthens the AC Joint superiorly?

The AC Ligament. Signup and view all the answers

Which ligament supports the AC Joint the most?

The Coracoclavicular Ligament. Signup and view all the answers

What type of joint is the Glenohumeral Joint?

A synovial ball-and-socket joint that permits a wide range of movement. Signup and view all the answers

What articulates in the Glenohumeral Joint?

The Humeral Head articulates with the relatively small and shallow Glenoid Cavity of the scapula. Signup and view all the answers

What are both articular surfaces of the Glenohumeral Joint covered by?

Both articular surfaces are covered with hyaline cartilage. Signup and view all the answers

Which ligament is formed between the Coracoid Process and the Acromion?

Coraco-acromial Ligament. Signup and view all the answers

What forms the Coracoacromial Arch?

Coracoid Process + Coraco-acromial ligament + Acromion. Signup and view all the answers

Which ligament covers the tendon of the Long Head of Biceps?

Transverse Humeral Ligament. Signup and view all the answers

What is the ligament formed by the Coracoid Process and the Humerus?

Coraco-humeral Ligament. Signup and view all the answers

What does the Fibrous Layer in the Glenohumeral Joint enclose superiorly?

The Fibrous Layer encloses the proximal attachment of the long head of biceps brachii muscle to the supraglenoid tubercle. Signup and view all the answers

Which part of the Glenohumeral Joint is the weakest?

The inferior part, as it is the only part not reinforced by the rotator cuff muscles. Signup and view all the answers

Study Notes

Sternoclavicular Joint (SC Joint)

A synovial joint between the sternal end of the clavicle, manubrium of the sternum, and the 1st costal cartilage.
Functions as a saddle-type joint while behaving like a ball-and-socket joint.
Divided into two compartments by an Articulation Disc, attached to anterior/posterior SC ligaments and the interclavicular ligament.
The sole connection between the upper limb and the axial skeleton, playing a crucial role in upper limb mobility.
Blood supply from Internal Thoracic and Supra Scapular arteries; innervated by the medial supraclavicular and subclavian nerves.
Supported by several ligaments: Anterior and Posterior Sternoclavicular ligaments, Interclavicular ligament, and Costoclavicular ligament, enhancing strength and mobility.

Acromioclavicular Joint (AC Joint)

Formed by the acromial end of the clavicle and the acromion; classified as a plane synovial articulation.
Internal surface of the fibrous capsule lined with synovial membrane.
Relatively weak but strengthened by the Trapezius muscle's fibers superiorly.
Reinforced by the AC ligament, extending from acromion to clavicle.
Supported by the Coracoclavicular ligament, composed of the Conoid and Trapezoid ligaments, which maintain integrity and prevent displacement of the acromion.

Glenohumeral Joint

A synovial ball-and-socket joint that allows a wide range of motion but has relative instability due to its mobility.
The humeral head articulates with the shallow glenoid cavity of the scapula, slightly deepened by the fibrocartilaginous Glenoid Labrum.
Articular surfaces covered with Hyaline Cartilage for smooth movement.
Coracoacromial ligament connects the Coracoid Process and Acromion, forming the Coracoacromial Arch.
Transverse Humeral ligament covers the tendon of the Long Head of Biceps.
Coraco-humeral ligament extends from the Coracoid Process to the Humerus, strengthening the joint.
The fibrous layer encloses the proximal attachment of the long head of biceps brachii muscle at the supraglenoid tubercle.
The weakest point of the Glenohumeral Joint is the inferior part, lacking reinforcement from the rotator cuff muscles.

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Description

Test your knowledge of the upper limb joints with these informative flashcards. This quiz focuses on the Sternoclavicular Joint, including its structure and function. Perfect for students learning anatomy!