COS Neck/Chest/Arm Muscle Function

Chewing

• Temporalis & Masseter

• Platysma & Sternocleidomastoid

• Trapezius and Latissimus Dorsi

• Masseter and Platysma

Draws lip and corner of mouth sideways and down, as in surprise

• Platysma

• Sternocleidomastoid

• Masster

• Temporalis

Move head side to side and up and down

• Sternocleidomastoid

• Trapezius

• Pectoralis Major

• Platysma

Draws head back and elevates shoulder blades

• Trapezius

• Latissimus Dorsi

• Pectoralis Major

• Serratus Anterior

Swinging arms

• Pectoralis Major & Latissimus Dorsi

• Temporalis & Masseter

• Pectoralis Major & Serratus Anterior

• Serratus Anterior & Deltoid

Lifts the arm and helps with breathing

• Serratus Anterior

• Pectoralis Minor

• Deltoid

• Latissimus Dorsi

Lifts or turns the arm

• Deltoid

• Triceps

• Flexor

• Extensor

Raises forearm, bends elbow

• Biceps

• Triceps

• Deltoid

• Flexor

Extends forearm

• Triceps

• Biceps

• Deltoid

• Pronator

Turns palm of the hand up

• Supinator

• Pronator

• Flexor

• Extensor