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The Muscular System has many different major muscle 

groups within itself. Here are the 8 major muscle groups 

listed in this book:

- Pectoralis Major               

- Orbicularis Oculi               

- Masseter                     

- Sternocleidomastoid

- Trapezius

- Deltoid

- Latissimus Dorsi

- Abdominals

This is the Pectoralis Major. This 

group is found in your upper chest. 

The Pectoralis Major has four actions 

that are mainly responsible for the 

movement of the shoulder joint.

This is the Orbicularis Oculi. 

This group is found in your 

maxillary and frontal bones, 

mainly around the skin around 

your eyes. This group allows the 

body to open and close the eye.

This is the Masseter. This group 

is found in the Zygomatic arch. 

The Masseter elevates and 

protracts mandible, which is your 

jaw.

This is the Sternocleidomastoid. 

This group is found attached to your 

sternum, clavicle, and mastoid 

process. This group is responsible 

for the movement of the head and 

neck.

This is the Trapezius. This muscle 

group covers your upper back and 

extends down the middle of your spine. 

The Trapezius rotates and retracts 

scapula and also elevate and depress 

scapula.

This is the Deltoid. This group is found 

on the upper most part of the arm and 

on top of the shoulder. The Deltoid has 

three parts to it. The Lateral portion 

abducts arm. The Anterior portion flexes 

arm at shoulder. The Posterior portion 

extends arm at shoulder.

This is the Latissimus Dorsi. This 

muscle group is found in the middle 

of the back and is partially covered 

by the Trapezius. The Latissimus 

Dorsi is responsible for adduction, 

transverse extension, and rotation of 

the shoulder joint.

This is the Abdominals. This 

muscle group is divided into nine 

regions in the abdominal cavity. 

This group has many functions 

but one is to provide a tonic, 

elastic muscular support for the 

viscera.

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