MUSCLES OF THE CHEST & BACK

MUSCLES OF SCAPULAR STABILIZATION Trapezius Rhomboid major, minor Levator scapula Serratus anterior Pectoralis minor

Trapezius O: Occiput & spines of C7, T1-T12 I: Clavicle (lateral 1/3 & acromion process) & spine of scapula A: Elevates, retracts, depresses scapula A: Extends neck when O/I switched

Trapezius – Spino, Acromio, clavotrapezius

Rhomboid Major, Minor O: Spinous processes: minor- C7-T1; major T2-T5 I: Vertebral border of scapula A: Retracts scapula

Rhomboid Minor, Major

Levator Scapula O: Transverse processes C1-C4 I: Upper medial border of scapula A: Elevates scapula A: Extends neck when O/I switched

Levator Scapula

Serratus Anterior O: Ribs 1-8 I: Medial border of scapula (costal side) A: Protracts scapula

Serratus Anterior

Pectoralis Minor O: Ribs 3-5 I: Coracoid process of scapula A: Depression, protraction of scapula

Pectoralis Minor

Brachial Plexus

MUSCLES OF THE ROTATOR CUFF (MUSCULOTENDINOUS CUFF) Supraspinatus Infraspinatus Teres minor Subscapularis

Rotator Cuff

Supraspinatus O: Supraspinous fossa of scapula I: Greater tubercle of humerus A: Abducts arm

Supraspinatus

Infraspinatus O: Infraspinous fossa of scapula I: Greater tubercle of humerus A: Adducts arm A: Laterally rotates arm

Infraspinatus

Teres Minor O: Axillary border of scapula I: Greater tubercle of humerus A: Laterally rotates arm Posterior view Posterior view Anterior view

Teres Minor

Subscapularis O: Subscapular fossa of scapula I: Lesser tubercle of humerus A: Medially rotates arm

Subscapularis

MUSCLES ACTING ON THE SHOULDER JOINT Deltoid Pectoralis major Latissimus dorsi Teres major

Deltoid O: Lateral clavicle, spine of scapula I: Deltoid tuberosity of humerus A: Abducts arm A: Ant. Fibers: flexes/ medially rotates arm A: Post. Fibers: extends/ laterally rotates arm

Deltoid – Spino, acromio, clavodeltoid

Pectoralis major O- Medial clavicle, sternum, costal cartilages of ribs I- Intertubercular groove of humerus A- Adducts, medially rotates arm

Pectoralis major

Latissimus dorsi O: Spines of lower thoracic & lumbar vertebrae, iliac crest I: Intertubercular groove of humerus A: Extends, adducts, medially rotates arm

Latissimus dorsi

Teres major O- Axillary border of scapula I- Intertubercular groove of humerus A- Adducts, medially rotates, extends arm

Teres Major

DEEP MUSCLES OF THE BACK 1) Erector Spinae 2) Iliocostalis 3) Longissimus 4) Spinalis 5) Splenius Cervicis & Capitus

Deep Back Muscles