Shoulder Joint OIA
The OIA for levator scapulae muscle
origin: traverse processed of C1 to C4
insertion: medial border of scapula
action: elevation
The OIA for Teres Major
origin: lateral border of scapula
insertion: intertubercular groove of humerus
action: adduction and extension
the shoulder joint range of motion for internal/external rotation
70-90 degrees
the two major bones of the shoulder girdle
scapula and clavicle
These are the primary functions of a bursa
1. reduced friction 2. provide protection
The OIA for serratus anterior muscle
origin: upper 9 ribs at side of the chest
insertion: whole length of medial border of scapula
action: abduction
The OIA for Deltoid
origin: anterior lateral clavicle and acromion process
insertion: deltoid tuberosity (on lateral humerus)
action: anterior is flexion, middle is abduction, posterior is extension
The shoulder joint range of motion for abduction
180 degrees
The 2 primary shoulder joint bones
scapula and humerus
The reason the scapulothoracic joint is special
its not a true diarthrodial joint because it does not have a joint capsule/synovial fluid
-- joint moves based on dynamic stabilizers (muscles)
The OIA for trapezius muscle
origin: base of skull and occipital protuberance
insertion: clavicle and acromion process
action: upper trap is elevation, middle trap is adduction, lower trap is depression
The OIA for Pec Major
origin: clavicle and sternum
insertion: intertubercular groove of humerus
action: horizontal adduction
the shoulder joint range of motion for flexion
180 degrees
the shoulder joint/glenohumeral joint ligaments
1. superior glenohumeral ligament
2. middle glenohumeral ligament
3. inferior glenohumeral ligament
The three phases of shoulder flexion/abduction
1. shoulder joint movement
2. add shoulder girdle movement
3. add spinal column movement
The OIA for rhomboid muscle
origin: spinous processes of C7 to T5
insertion: medial border of scapula
action: adduction
The OIA for latissimus dorsi
origin: posterior ilium, sacrum, spinous process of T7 - L5
insertion: intertubercular groove of humerus
action: adduction and extension
The shoulder joint range of motion for extension
60 degrees
The three shoulder girdle ligaments
1. acromioclavicular ligament
2. sternoclavicular ligament
3. coracoclavicular ligament (made up of 2)
-- trapezoid ligament and conoid ligament
Abduction correlates to _________ and adduction correlates to _________ when discussing the shoulder girdle
protraction ; retraction
The OIA for Pec. Minor
origin: ribs 3-5
insertion: coracoid process of scapula
action: abduction
The OIA for Rotator Cuff Muscles
subscapularis muscle:
origin: subscapular fossa
insertion: lesser tubercle of humerus
action: internal rotation
supraspinatus muscle:
origin: supraspinous fossa
insertion: greater tubercle of humerus
action: abduction
infraspinatus muscle:
origin: infraspinous fossa
insertion: greater tubercle of humerus
action: external rotation
teres minor muscle:
origin: lateral border of scapula
insertion: greater tubercle of humerus
action: external rotation
the shoulder joint range of motion for horizontal abduction and adduction
45 degrees ; 135 degrees
This shoulder joint ligament is under the MOST stress
inferior glenohumeral ligament
The important function of the rotator cuffs
vital in maintaining humeral head in correct approximation within glenoid fossa