Shoulders and Arms Flashcards
Deltoid Action: All fibers
Abduct the shoulder
Deltoid Action: Anterior fibers
Shoulder:
Flex
Medially Rotate
Horizontally Adduct
Deltoid Action: Posterior fibers
Extend the shoulder
Laterally Rotate the shoulder
Horizontally abduct the shoulder
Deltoid Origin
Lateral one third of clavicle, acromion and spine of scapula
Deltoid Insertion
Deltoid tuberosity
Trapezius Actions: Upper Fibers
Bilaterally: Extend the head and neck
Unilaterally:
Laterally flex the head and neck to the same side
Rotate the head and neck to the opposite sides
Elevate the scapula
Upwardly rotate the scapula
Trapezius Actions: Middle Fibers
Adduct the scapula
Stabilize the scapula
Trapezius Actions: Lower Fibers
Depress the scapula
Upwardly rotate the scapula
Trapezius Origin
External occipital protuberance,
medial portion of the superior nuchal line of the occiput,
ligamentum nuchae and spinous process of C-7- T-12
Trapezius Insertion
Lateral one-third of clavicle, acromion, and spine of scapula
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Latissimus Dorsi Actions
Shoulder:
Extend
Adduct
Medially rotate
Latissimus Dorsi Origin
Inferior angle of scapula,
spinous process of last six thoracic vertebrae,
last three or four ribs,
thoracolumbar aponeurosis,
and posterior iliac crest
Latissimus Dorsi Insertion
Intertubercular groove of the humerus
Teres Major action
Extend shoulder
Adduct shoulder
Medially rotate shoulder
Teres Major Origin
Inferior angle and lower one third of the lateral border of the scapula
Teres Major Insertion
Crest of the lesser tubercle of the humerus
Rotator Cuff Muscle “SITS”
S: Supraspinatus
I: Infraspinatus
T: Teres Minor
S: Subscapularis
Supraspinatus Action:
Abduct shoulder
Stabilize head of the humerus in the glenoid cavity
Supraspinatus Origin
Supraspinous fossa of the scapula
Supraspinatus Insertion
Greater tubercle of the humerus
Infraspinatus Action
Laterally rotate the shoulder
Adduct the shoulder
Stabilize the head of the humerus in the glenoid cavity
Infraspinatus Origin
Infraspinous fossa of the scapula
Infraspinatus Insertion
Greater tubercle of the humerus
Teres Minor Action
Laterally rotate the shoulder
Adduct the shoulder
Stabilize the head of the humerus in the glenoid cavity
Subscapularis Action
Medially rotate the shoulder
Stabilize the head of the humerus in the glenoid cavity
Subscapularis Origin
Subscapular fossa of the scapula
Subscapularis Insertion
Lesser tubercle of the hummerus
thoracolumbar aponeurosis
a strong aponeurosis composed of three layers that extends the thoracic region to the sacrum and separates the paraspinal muscles from the muscles of the posterior abdominal wall
