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

whenO/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 THEROTATOR 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 armA

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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: Intertuberculargroove 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

http://home1.gte.net/imagine/Pectoralis%20Minor.jpg

Deep Back Muscles