Sterno – Clavicular Joint
Between the sterna end of the clavical, clavicular notch on the STERNUM and the costal cartilage of the 1st rib. To help compensate for sterna end of the clavical being larger than the clavicular notch the joint has a fibrous articular disc which completely subdivides the joint cavity into two. This articular disc whis is attached above to the superior aspect of the clavical, below to the costal cartilage of the 1st rib and it’s periphery which attaches to the capsule.
Type of Joint
Synovial double plane or gliding joint.
1.Joint – Capsule:
Attached to articular margins. The capsule is lined with synovial fluid membrane, this is reflected onto both surfaces of articular discs.
2. Anterior Sterno – clavicular Ligaments:
Strenghtens the joint anteriorly. Fibres pass down and medially from the anterior surface of the clavical to the anterior surface of the manubrium.
3.Posterior Sterno – clavicular Ligament:
Strenghtens the joint posteriorly. The fibres pass downward and medially from the posterior surface of the clavical to the posterior surface of the manubrium.
4.Inter – clavicular Ligament:
Strenghtens the joint superiorly which run between both clavicles on their superior aspects (attachments), some of the fibres are attached to the superior part of the manubrium.
This will be discussed with the Acromio – clavicular Joint