Muscular system

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The muscular system encompasses all the muscles of the body. It makes up about 40% of total body weight and serves many functions such as mobility, thermogenesis and digestion. Based on which type of muscle tissue they contain, muscles are classified into three types:

• Skeletal muscle, together with bones comprise the musculoskeletal system that provides voluntary movement.
• Cardiac muscle, that composes the muscular layer (myocardium) of the heart.
• Smooth muscle, that composes the muscular layer of blood vessels and hollow organs.

Muscle types are further grouped based on their histological appearance, in which skeletal and cardiac muscle are grouped as striated, and smooth muscle as non-striated. Find out more about each muscle type, their features, location and function by watching the video below.

If you’re curious and want to know more about how muscles are named, watch the following video; it will help you to easier identify and memorize all the 600+ muscles in the body.

To improve your understanding of muscular system terminology, take a closer look at some commonly used roots, prefixes and suffixes related to the muscular system in the video below.

Take a quiz

After watching the video, you should have gained some basic knowledge about the muscular system. Put that knowledge to the test with our quiz about the muscular system below!

To challenge yourself further, customize your own quiz on a broader array of topics.

Download the following PDF worksheets and learn the main muscles of the upper and lower limbs.

BLANK WORKSHEET (PDF)LABELED WORKSHEET (PDF)

Browse atlas

Now it's time to take a closer look at the main muscle subgroups of the body by browsing our atlas gallery below.

Here you can look at some of the most notable individual muscles of the body.

Summary