Pas 407 Shoulder Girdle: Questions & Accurate Answers

Where does axioappendicular muscles originate off and attach to? {Ans: originate off thorax to attach to scapula, clavicle, humerus}sternal head/clavicular head of pectoralis major image {Ans: }scapulothoracic joint {Ans: Theoretical physiological combination of sternoclavicular and acromioclavicular joints Synergistic movements permit greater range of motion of upper limb - e.g. scapulohumeral rhythm Arm abduction - 60 deg scapulothoracic + 120 deg glenohumeral = 180 deg arm abduction (First 30 deg of abduction movement is exclusively in the glenohumeral joint, beyond this however every two degrees of glenohumeral abduction is accompanied by one degree of upward rotation of scapula If it were not for the movement of scapula, shoulder abduction would be limited to about 120 degrees)}What is the shoulder subdivided into? {Ans: pectoral region - anterior deltoid region - lateral scapular region - posterior}clavicular fractures {Ans: structural weak point 2/3 along the mid shaft of the clavicle. arguably the most commonly broken bone in the body. fx causes prominent deformity due to elevation of medial fragment (due to muscle pull) and sag of lateral aspect (due to limb sag)}Pectoralis minor muscles {Ans: deeper part of pectorial region broad origin off ribs 3-5 fibers converge upon