In this Anatomy Lessons, we’ll develop understanding about Basics of Muscle Anatomy in Human, how muscles work and its anatomy at LTY. My name is Lalit Adhikari. Let’s get started.

Introduction to Muscle Anatomy

Here, I will tell you about, what you have to learn in each muscle and some general muscle anatomy.

Although, there are basic checklists of things that you must know about muscles prior to learning any muscle anatomy but that depends upon how deep you want to learn.

For example: muscles name, origin, insertion, function, antagonist, and form. It not very important to know the name of every muscle, but knowing the name does have its benefits.

Knowing the muscles name allows us to remember every intrinsic detail about muscles when you are drawing. There is usually some logic to the name that hints at the muscle’s locationfunction or form.

For example: the ‘Extensor Digitorum’ muscle. This is the muscles in your hands that extends or straightens your digits.

muscle anatomy
Extensor Digitorum

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The Origin and Insertion

Where the muscles attach it’s important to know as well. It helps us precisely and confidently map out the muscles. It also hit’s at the muscle’s function.

There are two areas of attachments in a muscle:

  • The Origin
  • Insertion
muscle anatomy
The Origin and Insertion
  • The Origin: It is the attachment to the skeleton that is more stationary and close to the center.
  • The Insertion: It is the attachment of the further and more movable part of the body.

You should also know about the function or action each muscle is responsible for. And luckily, knowing the function is pretty easy because muscles can only do one thing i.e. contract.

muscle anatomy
Relaxation & Contraction

When you flex a muscle it contracts and pulls the insertion closer to the origin. Muscles work in pairs. When one muscles contract, it’s antagonist is stretched out.

muscle anatomy
Active & Relaxed

The biceps flexes the arm and the triceps extend the arm. In your drawings try to exaggerate the hardness of the active muscles and let the relaxed muscles conform to gravity.

muscle anatomy
figure drawing

Being aware of the muscles function before drawing the figure is good so that you can know which muscles to flex and which to relax and your poses will have greater animations and impact because of it.

hulk muscle anatomy
Hulk’s figure drawing

If you want to draw a superhero figure, then you can definitely ignore what I’ve just said above.

A muscle’s name attachments and function can be summed up in just a few words. But we all are artists, what we really need to study is the shape and form of muscles.

We have to understand the muscles in three dimensions so that we can draw its shape from all angles. This includes variations of muscles like stretched, relaxed or flexed and different body types.

To understand that you need to study the plane changes, the simplified forms and other details of the muscles. It will help you to invent figures from your imagination and make them anatomically correct and dynamic.

In a muscle, there are two parts:

  • Muscles Fibers
  • Tendons

The muscle fibers usually flow from the axis of muscles, though there are exceptions. Muscles fibers are grouped into bundles which can be seen on the surface form, usually when the muscles are active.

Wrinkles and skin fold always happen in the perpendicular direction of the muscles fibers. When you flex a muscle, it’s the muscle fibers that shortens not the tendons.

Tendons are like the tape that attaches the muscles to the bones. They don’t squash or stretch but they vary in shape, length, and thickness from tendons to tendons. Tendons are thick enough that they will add mass to the surface form.

Here, you need to understand a thing:

  • Tendons connect muscle to bone.
  • Ligaments connect bone to bone
  • Fascia connects muscle to muscle.

An aponeurosis is a special type of tendon that’s large and thin. And for artists, that means it won’t obscure the form of the muscles beneath it.

An interesting fact is that- the length of the muscle fibers versus the length of the tendons varies from person to person. Bodies with proportionally longer muscle fibers tend to look more graceful. 

Even if the individual is very muscular, the muscles appear to curve in and out in elegant slender slopes.

If you are following our Free Anatomy Lessons and Tutorial Guide, then next you should read about, ‘Male Anatomy in Comic Style‘.

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Lalit Adhikari
Lalit Adhikari

Lalit Adhikari is the Main Author and Admin at Learn That Yourself. He has work experience of more than 10 years in the field of Multimedia and teaching experience of more than 5 years.

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  1. Loved how detailed you broke down the entire anatomy of muscles. Definitely would love to see you expand on maybe some fitness tips in coordination with muscle anatomy in a future post!

  2. Definitely worth reading. Never actually got to read about muscles after school. And the way you have explained makes it interesting to read.

  3. It’s nearly impossible to find educated people abоut muscle anatomy but you sound like you know what you’re tаlkіng about! Thanks

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