# The Pectoralis Minor Muscle, Its Attachments And Actions - Yoganatomy

> Source: https://www.yoganatomy.com/pectoralis-minor-muscle/
> Updated: 2023-10-12T19:36:38+00:00
> Type: Post
> Categories: Upper Limb | Tags: muscle, scapula, shoulders

The pectoralis minor muscle is the muscle of the month. See where it is located, where it attaches, and what its actions are.

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## The pectoralis minor muscle

The pectoralis minor muscle is the little brother, if you will, of the larger more popular pectoralis major muscle. One of the most important things to remember about this muscle is that it lies over the top of the brachial plexus and can cause trouble down the arm.

## What does pectoralis minor mean?

The name of the pectoralis minor muscle describes the general location of this [muscle](https://www.yoganatomy.com/tag/muscle/). Pectoralis comes from the Latin word “pectus” meaning breast. Minor comes from Greek and means “the lesser”. This is the smaller of the two pectoralis muscles.

[![The Pectoralis Minor Muscle](https://www.yoganatomy.com/wp-content/uploads/2015/05/pectoralis-minor-muscle.jpg)](https://www.yoganatomy.com/wp-content/uploads/2015/05/pectoralis-minor-muscle.jpg)

## Where does the pectoralis minor attach?

### Origin

It originates on the third, fourth, and fifth ribs.

### Insertion

It inserts on the coracoid process of the scapula.

[![The Pectoralis Minor Muscle Attachments](https://www.yoganatomy.com/wp-content/uploads/2015/05/pectoralis-minor-muscle-attachment.jpg)](https://www.yoganatomy.com/wp-content/uploads/2015/05/pectoralis-minor-muscle-attachment.jpg)

## What actions does the pectoralis minor do?

- Depression
- Downward rotation
- Protraction

## What are the most common injuries to this muscle?

The pectoralis minor [muscle](https://www.yoganatomy.com/tag/muscle/) doesn’t necessarily get[injured](https://www.yoganatomy.com/category/yoga-injuries/). However, it is important to note that the nerves, as well as the arteries and veins that feed the arm, all run beneath this muscle. If the muscle is strained or gets too tight it can compress these structures, causing problems all the way down the arm. At this point, it usually fits in under a condition known as [thoracic outlet syndrome](http://en.wikipedia.org/wiki/Thoracic_outlet_syndrome).

## Postures where this muscle contracts

[![utpluthih or tolasana](https://www.yoganatomy.com/wp-content/uploads/2017/08/upluthih-yoga-anatomy.jpg)](https://www.yoganatomy.com/wp-content/uploads/2017/08/upluthih-yoga-anatomy.jpg)
*As we push into the floor and lift our body, our scapulae depress, which is an action of this muscle.*

## Postures where this muscle lengthens

[![dhanurasana](https://www.yoganatomy.com/wp-content/uploads/2017/08/dhanurasana-yoga-anatomy.jpg)](https://www.yoganatomy.com/wp-content/uploads/2017/08/dhanurasana-yoga-anatomy.jpg)
*In dhanurasana the scapulae are retracted, stretching this muscle.*

## Trigger points in pectoralis minor

[![The Pectoralis Minor Muscle Trigger Points](https://www.yoganatomy.com/wp-content/uploads/2015/05/pectoralis-minor-tp.jpg)](https://www.yoganatomy.com/wp-content/uploads/2015/05/pectoralis-minor-tp.jpg)