Joints of the Pectoral Girdle and Upper Limb Flashcards
what is the sternoclavicular joint?
saddle joint between saddle-shaped clavicular facet of manubrium and superior surface of first costal cartilage with the medial surface of the clavicle
what does the sternoclavicular joint allow for?
complex movement
what divides the cavity of the sternoclavicular joint?
articular disc
what are the 4 strong ligaments contained in the sternoclavicular joint?
anterior sternoclavicular ligament
posterior sternoclavicular ligament
interclavicular ligament
costoclavicular ligament
what is the acromioclavicular joint?
synovial plane joint between acromion and clavicle
what supports the acromioclavicular joint?
directly by the acromioclavicular ligament
indirectly by coracoclavicular ligament (conoid and trapezoid portions)
what is the glenohumeral joint?
shoulder joint: ball and socket joint
what deepens the glenoid cavity? why is this necessary? what does this do?
glenoid labrum
the glenoid cavity is very shallow
reduces joint stability but increased range of motion
the loose and thin articular capsule of the glenohumeral joint extends from what to what?
glenoid cavity to the anatomical neck of the humerus
what is the only strong thickening of the glenohumeral joint capsule? why?
inferoposterior border of coracohumeral ligament
supports the weight of the upper limb
what thickens the anterior capsule of the glenohumeral joint?
3 weak glenohumeral ligaments
what mostly contributes to the stability of the glenohumeral joint?
muscle tendons crossing the joint
The long head of the biceps brachii tendon travels __________ the glenohumeral joint cavity and attaches to the _____________. What is the function of this?
into, supraglenoid tubercle
secures head of the humerus to the glenoid cavity
what muscles encircle the glenohumeral joint? what do the tendons do?
rotator cuff muscles, tendons merge with capsule
What is the elbow joint?
hinge joint through the trochlear notch of the ulna
