Scalene Muscles

November 7, 2017
Scalene Muscles

Exploring the scalene muscles

There are actually three scalene muscles on each side of the neck that function together. They are the scalenus anterior, scalenus medius, and scalenus posterior. Sometimes there is also a scalenus minimus, but it’s not especially common.

Secondary Breathing Muscles

What does scalene mean?

The name “scalene” is related to the Greek word skalenos which was used to refer to a triangle of unequal sides. The name refers to the shape that is formed when the three scalene muscles come together on each side of the neck to form a scalene triangle.

Signup for our newsletter!

Get the latest articles in your inbox each month.

"*" indicates required fields

Where do the scalene muscles attach?


Specifically, these three muscles originate together on the transverse processes of the vertebrae from the third to the sixth cervical vertebrae (C3 to C6). Remember that the transverse processes are the bony projections that stick out on the sides of each vertebrae.


The anterior and middle scalene muscles insert on the first rib, while the posterior scalene inserts on the second rib.

The Scalene Muscle Attachments

Learn a system for working with injuries

What actions do the scalene muscles do?

They function unilaterally, to assist in lateral flexion of the neck to the same side. The scalenes as a group also assist as secondary respiratory muscles. If we are in a situation where we need to get more air into the lungs, these muscles will kick in and lift the ribs that they attach to. They work to assist in forced inspiration or inhalation, for example, when we are running or hiking up a steep hill.

Poses where these muscles contract


Similarly to the sternocleidomastoid muscles, in navasana, the scalene muscles are also isometrically contracting to help stabilize the head and neck.

Poses where these muscles are lengthened

warrior 1

Also like the sternocleidomastoid, when we look up in warrior pose, slowly taking our head back, the scalene muscles would help control this movement through an eccentric contraction.


In a posture like halasana, our neck flexes. But, this doesn’t mean that we necessarily contract these muscles to flex it. In this case, the scalenes may shorten, but do not necessarily contract.

Trigger points

Trigger Points in The Scalene Muscles