back muscles

prime mover of head extension

• splenius capitis

• levator scapulae

• infraspinatus

• supraspinatus

elevates scapula

• levator scapulae

• Rhomboid Major and Minor

• Infraspinatus

• supraspinatus

abducts the arm at the shoulder joint and stabilizes the shoulder joint

• supraspinatus

• infraspinatus

• levator scapulae

• splenius capitis

rotates humerus and stabilizes the shoulder joint

• Infraspinatus

• supraspinatus

• Rhomboid major and minor

• levator scapulae

retract scapula

• Rhomboid major and minor

• Infraspinatus

• Supraspinatus

• levator scapulae

helps tilt, turn the head and neck, shrug, steady the shoulders and twist the arms

• trapezius

• latissimus dorsi

• deltoid

• Rhomboid

contraction of the muscle fibers flexes and rotates the arm by pulling the humerus towards the clavicle

• deltoid

• trapezius

• splenius capitis

• latissimus dorsi

largest muscle in the upper body, responsible for pulling the arm towards the pelvis, movement of shoulder joint and assists with stabilizing the spine

• latissimus dorsi

• deltoid

• trapezius

1

• splenius capitis

• levator scapulae

• trapezius

10

• latissimus dorsi

• deltoid

• trapezius

• rhomboid