ANAT: Joints of Upper Extremity Flashcards
Sternoclavicular (SC) joint attachment
medial clavicle, sternal manubrium, and 1st costal cartilage
-Articular disc which attaches inferiorly to the 1st costal cartilage and superiorly to the medial clavicle. Anterior/posterior edges attach to fibrous joint capsule (resists superior and medial clavicular dislocation)
Intrinsic ligaments of the SC joint
thickening of the anterior, posterior and superior capsule
Extrinsic ligaments of the SC joint
Costoclavicular ligament, Interclavicular ligament
Costoclavicular ligament
Saddle-joint
attaches the inferomedial clavical to the 1st costocartilage and rib
*Resists superior dislocation of the clavicle
Interclavicular ligament
Spans the superior manubrium (adjacent clavicles)
*Resists lateral dislocation of the clavicle
SC joint motion
Multiaxial; elevation/depression of pectoral girdle, protraction/retraction of PG, rotary motion of above movements
Acromioclavicular (AC) joint attachments
Plane-type joint
Between the lateral clavicle and acromion process of the scapula
Acromioclavicular ligament
Intrinsic ligament of the AC joint, thickening of superior joint capsule
Resists superior dislocation
Coracoclavicular ligament
Extrinsic ligament of the AC joint, main supporting ligament.
Runs from inferolateral clavicle to the coracoid process of the scapula
Two portions: conoid ligament - Medial, vertically oriented, extends from root of the coracoid process
Trapezoid ligament - lateral, horizonitally oriented extending from body of coracoid process
*Resists superior dislocation of the clavicle - suspends scapula, and weight of the upper extremity
Acromioclavicular joint motion
gliding movement of the AC joint enable rotation of the scapula
Glenohumeral joint attachment
Ball-and-socket synovial joint, between glenoid fossa of scapula and head of humerus
Glenoid labrum
fibrocartilaginous ring around the glenoid fossa; slightly deepens fossa
Fibrous joint capsule of the glenohumeral joint
Attaches to margins of the glenoid fossa and the anatomical neck of the humerus, this and loose except at extremes of motion
Pierced by biceps brachii tendon
Intrinsic ligaments of the glenohumeral joint
superior, middle, and inferior glenohumeral ligaments
-reinforce the anterior capsule
Coracohumeral ligament
Coracohumeral ligament
-Intrinsic ligament of GH joint
attaches to base of the coracoid process and greater tubercle of the humerus
free at anterior margin but fuses with joint capsule posteriorly
*Reinforces the superior capsule and resists inferior dislocation
Coracoacromial ligament
Extrinsic ligament of GH joint
Attaches at coracoid process and acromion to form the coracoacromial arch
*Prevents superior dislocation of the humerus
Transverse humeral ligament
Extrinsic GH joint ligament
bridges the intertubercular groove - creates a canal for the tendon of the long head of biceps brachii m.