chapter 12 shoulder girdle Flashcards
Scapula
Attaches indirectly to the rib cage
Anteriorly concave and glides over the convex rib cage posteriorly
Located between T2 or T3 and T7 or T9
Resting position of the scapula?
Vertebral border 2 – 3” lateral to the spinous processes
Scapulothoracic is it a joint and what’s its function?
NO,
Scapula moves over the rib cage of the thorax
Not directly attached
Connected indirectly via the clavicle and several muscles
Provides motion and flexibility to the body
the functions of sternoclavicular joint
Shock absorber
Contributes to joint motions , Clavicle & disk, Sternum & disk
↑size of articular surface
Blocks medial movement of clavicle on to sternum
the functions of sternoclavicular ligament
Anterior and posterior
Reinforces joint capsule
the functions of Costoclavicular ligament
Rhomboid-shaped ligament
Limits clavicular elevation
the function of Interclavicular ligament
Connects sternal ends of clavicles
Limits clavicular depression
the function of acromionclavicular
Connects acromion process with lateral clavicle
Plane-shaped synovial joint
Gliding motion occurs in all planes
the function of acromioclavicular ligament
Reinforces the capsule
Hold the acromion process to the clavicle and prevent dislocation of the clavicle
The sternoclavicular (SC) and acromioclavicular (AC) joints allow shoulder girdle motion
Elevation and depression
Protraction and retraction
Upward and downward rotation
the function of Coracoclavicular ligament
Not directly located at the acromioclavicular joint
Trapezoid portion – lateral
Conoid portion – medial
Prevent backward motion of the scapula & limit rotation
the function of Coracoacromial ligament
Connects coracoid process to acromial process
Roof over head of the humerus, serves as a protective arch
the upward rotation muscle in what direction are they pulling?
upper traps - pull ups
Lower traps- pulls down
serrates anterior- pulls out and anterior
the downward rotation muscles in what direction is pulling?
elevator scapula - pull ups
rhomboids- pull in
pectorals minor- pulls down
what nerves are the trapezius
cranial c3-c4
