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Shoulder 230

Muscles and movements

MuscleOriginInsertionMovementJointMisc. Info
Deltoid (anterior) Lateral third of clavicle Deltoid tuberosity of humerus Flexion, medial rotation Anterior One compartment of the deltoid
Biceps brachii Long head-supraglenoid tubercle of scapula; short head-coracoid process of scapula Radial tuberosity Flexion; short head-synergist for abduction Anterior, inferior to shoulder Long head runs through intubercular groove; fibrous lacertus: sheath of connective tissue that allows biceps brachii to have multiple actions
Coracobrachialis Coracoid process of scapula Anteromedial humerus (medial to deltoid tuberosity) Flexion, adduction Anterior, deep to biceps brachii Shares a tendon with biceps brachii
Trapezius (upper) External occipital protuberance (superior nuchal lines) Lateral third of clavicle Elevation, upward rotation Posterior, superficial (spine/scapula) One of four divisions of trapezius
Trapezius (upper middle) Ligamentum nuchae Acromion process Elevation, retraction Posterior, superficial (spine/scapula) One of four divisions of trapezius
Trapezius (lower middle) Spinous processes of thoracic vertebrae (6-12) Lateral/middle scapular spine Retraction Posterior, superficial (spine/scapula) One of four divisions of trapezius
Trapezius (lower) Spinous processes of thoracic vertebrae (6-12) Medial edge of scapular spine Depression, upward rotation Posterior, superficial (spine/scapula) One of four divisions of trapezius
Latissimus dorsi Spinous processes of lower thoracic/lumbar vertebrae via thoracolumbar fascia, iliac crest Medial lip of intertubercular groove (twists) Extension, adduction, medial rotation Posterior, superficial (spine/scapula) Forms posterior portion of axilla; "swimmer's muscle"; projects laterally, superiorly, under arm
Levator scapulae Transverse processes of cervical vertebrae (C1-C4) Superior angle of scapula (twist) Elevation, downward rotation; lateral flexion, ipsilateral rotation (fixed scapula) Posterior, deep (spine/scapula)
Rhomboids (minor and major) C7, thoracic vertebrae (minor superior to major) Medial border of scapula (where levator scapulae ends) Retraction, downward rotation, elevation Posterior, deep (spine/scapula) Role in scapulohumeral rhythm; stabilizes scapula when using pectoralis major
Serratus anterior Anterolateral ribs Medial border and inferior angle of scapula (anterior surface) Protraction, upward rotation (interior fibers); holds medial border firmly against thorax (prevents "winging") Deep (spine/scapula) "Boxer's muscle"
Deltoid (posterior) Inferior border of scapular spine Deltoid tuberosity of humerus Extension/hyperextension, lateral rotation Posterior, superficial (scapula/humerus)
Deltoid (middle) Acromion process Deltoid tuberosity of humerus Abduction (prime mover, anterior and posterior deltoid are synergists) Superficial (scapula/humerus)
Subscapularis Subscapular fossa Lesser tubercle of humerus Medial rotation Rotator cuff
Supraspinatus Supraspinous fossa Greater tubercle of humerus Abduction Rotator cuff Tendon is usually cause of "rotator cuff injuries"
Infraspinatus Infraspinous fossa Greater tubercle of humerus Lateral rotation Rotator cuff Acts with teres minor
Teres minor Lateral border of scapula Greater tubercle of humerus (inferior to infraspinatus) Lateral rotation Rotator cuff Acts with infraspinatus
Teres major Inferior angle of scapula Medial lip of intertubercular groove (anterior surface) (same-ish as latissimus dorsi) Extension, adduction, medial rotation Glenohumeral (posterior, deep) "Lat's little helper"; inserts inferior to teres minor
Triceps brachii (long head) Infraglenoid tubercle of scapula Olecranon process Shoulder extension Only muscle on posterior arm; only head to produce shoulder movements
Pectoralis major Sternal head-sternum (~rib 1-7); clavicular head-medial third of clavicle Lateral lip of intubercular groove (sternal superior to clavicular) (Both) adduction, medial rotation; (clavicular) flexion; (sternal) extension Anterior, superficial Forms anterior border of axilla; major muscle of upper trunk;
Pectoralis minor Anterior surface of ribs (3-5) Coracoid process Protraction, depression, downward rotation; pull ribcage superiorly (if scapula fixed) Anterior, deep to pectoralis major Smaller than pectoralis major
Created by: ktpognc