23 Joints (Sternoclavicular and Acromioclavicular) Flashcards
Describe the SC joint
The sternoclavicular joint is the articulation of the sternum, first rib and the medial end of the clavicle.
The sternoclavicular joint links the appendicular skeleton with the axial skeleton at the upper limb
It is a saddle joint that functions like a ball and socket joint.
What are the articulating surfaces of the SC joint?
The sternal / medial end of the clavicle articulates with the superior surface of the sternum, and the anterior surface of the first rib.
What are the 3 ligaments of the sternoclavicular joint?
Sternoclavicular joints (anterior and posterior) connect the sternum to the clavicle. (relatively weak)
Interclavicular joint spans the jugular notch and connects left and right clavicles (relatively weak)
Costoclavicular ligament connects clavicle to costocartilage of first rib (extremely strong)
What are the movements of the SC joint?
AP movement of the clavicle
elevation and depression of medial clavicle
rotation of medial clavicle
What is the nerve supply of the SC joint?
medial supraclavicular nerve, and nerve to the subclavius
Describe the AC joint
the acromioclavicular joint is the articulation of the lateral end of the clavicle and the acromion process of the scapula
the AC joint is a plane type of synovial joint
What are the ligaments of the AC joint?
Acromioclavicular ligament (superior and inferior) - weak
Coracoclavicular ligament (trapezoid laterally and conoid medially) - one of the strongest in the shoulder
Coracoacrominal ligament (between coracoid process and acromion process
What is the nerve supply to the AC joint?
Supraclavicular nerve, lateral pectoral nerve, and axillary nerve