Shoulder OIA Flashcards
What two sections are the muscles divided into?
- Scapular muscles (muscles that move the scapula)
- Glenohumeral muscles (muscles that act on the humerus)
Scapular muscles
Levator Scapulae
Trapezius
Rhomboideus Major
Rhomboideus Minor
Serratus Anterior
Pectoralis Minor
Glenohumeral muscles
Pectoralis Major
Latissimus Dorsi
Teres Major
Deltoid
Rotator Cuff
Suprespinatus
Infraspinatus
Teres Minor
Subscapularis
Levator Scapulae Origin
Transverse processes of C1-C4
Levator Scapulae Insertion
Medial border of scapula above the spine of the scapula
Levator Scapulae Action
Scapular elevation
Trapezius Origin
Occipital bone, ligamentum nuchae, spinous processes of C7-T12
Trapezius Insertion
Lateral clavicle, acromion process, spine of scapula
Trapezius Action
Elevates, rotates, adducts the scapula
Rhomboideus Major Origin
T2-T5 spinous processes
Rhomboideus Major Insertion
Medial inferior border of scapula
Rhomboideus Major Action
Adducts scapula
Rhomboideus Minor Origin
Ligamentum nuchae, C7-T1 spinous processes
Rhomboideus Minor Insertion
Superior, medial border of scapula
Rhomboideus Minor Action
Adducts scapula
Serratus Anterior Origin
Outer surfaces and superior border of ribs 1-9
Serratus Anterior Insertion
Ventral Scapular surface on medial border from superior angle to inferior angle
Serratus Anterior Action
Scapular protraction, upward rotation, depression, and elevation
Pectoralis Minor Origin
Superior margins and outer surface ribs 3-5 near cartilages
Pectoralis Minor Insertion
Coracoid process of the scapula
Pectoralis Minor Action
Scapular depression, downward rotation, protraction
(Sternal) Pectoralis Major Origin
Anterior surface of sternum cartilages of ribs 1-6 or 7
(Clavicular) Pectoralis Major Origin
Anterior surface of sternal 1/2 clavicle
Pectoralis Major Insertion
Greater tubercle of the humerus
Pectoralis Major Action
Shoulder flextion, adduction, internal rotation
Latissimus Dorsi Origin
Posterior layer of lumbodorsal fascia, then attaching to the T6-T12 lumbar and sacral vertebrae
Latissimus Dorsi Insertion
Intertubercular grooze (distal aspect)
Latissimus Dorsi Action
Glenohumeral adduction, extension, and internal rotation
Teres Major Origin
Dorsal surface of inferior angel
Teres Major Insertion
Lesser tuberosity of the humerus
Teres Major Action
Shoulder adduction, extension, internal rotation
Deltoid Origin
Lateral third of clavicle, acromion process, and spine of scapula
Deltoid Insertion
Deltoid tuberosity of humerus
Deltoid Action
Shoulder abduction, flexion and internal rotation, extension and external rotation
Supraspinatus Origin
Supraspinous fossa
Supraspinatus Insertion
Greater tubercle of humerus
Supraspinatus Action
Initiates shoulder abduction
Humeral head stabilization
Infraspinatus Origin
Infraspinous fossa
Infraspinatus Insertion
Greater tubercle of humerus
Infraspinatus Action
Shoulder external rotation
Humeral head stabilization
Teres Minor Origin
Lateral border of scapula
Teres Minor Insertion
Greater tubercle of humerus, posterior to infraspinatus
Teres Minor Action
Shoulder external rotation
Humeral head stabilization
Subscapularis Origin
Subscapular fossa
Subscapularis Insertion
Lesser tubercle of humerus
Subscapularis Action
Shoulder internal rotation
Humeral head stabilization
