The Anatomy of Chest Wall Muscles

May 11, 2020

Welcome to Shout It Marketing's detailed guide on the anatomy of the chest wall muscles. In this comprehensive breakdown, we will delve into the intricate structures that make up the chest wall muscles and their functions.

Chest Wall Muscle Anatomy

The chest wall is composed of various muscles that play a crucial role in supporting the thoracic cavity and facilitating breathing. Understanding the chest diagram muscles is essential for comprehending the complex movements involved in respiration and upper body function.

Muscles of the Chest

The muscle diagram chest includes several key muscles, each serving a specific purpose in stabilizing the chest wall and assisting in various arm movements. These muscles include the pectoralis major, pectoralis minor, serratus anterior, and the intercostal muscles.

Pectoralis Major

The pectoralis major is a large, fan-shaped muscle that covers much of the upper chest area. It is responsible for various movements of the shoulder joint, such as flexion, adduction, and internal rotation.

Pectoralis Minor

The pectoralis minor lies beneath the pectoralis major and aids in stabilizing the scapula. It plays a role in movements that involve protraction and depression of the shoulder blade.

Serratus Anterior

The serratus anterior, often referred to as the "boxer's muscle," originates from the surface of the upper ribs and inserts along the medial border of the scapula. This muscle is crucial for protracting the scapula and facilitating arm movements.

Intercostal Muscles

The intercostal muscles are situated between the ribs and play a vital role in the expansion and contraction of the thoracic cavity during breathing. These muscles are categorized as external and internal intercostals, each assisting in different aspects of respiration.

Function of Chest Wall Muscles

Understanding the chest wall muscle anatomy is key to comprehending the intricate functions of these muscles. The coordinated contraction and relaxation of these muscles enable movements such as ribcage expansion during inhalation and compression during exhalation.

Furthermore, the chest wall muscles provide stability to the thoracic region, support the shoulder girdle, and contribute to overall upper body strength and posture.


In conclusion, the anatomy of chest wall muscles is a fascinating and complex area of study that plays a crucial role in various bodily functions. By exploring the detailed structures and functions of these muscles, we gain a deeper understanding of the mechanics behind breathing, arm movements, and overall upper body stability.

Stay tuned to Shout It Marketing for more in-depth insights into the world of human anatomy and physiology.