The major muscle in the chest is the pectoralis major. This large fan-shaped muscle stretches from the armpit up to the collarbone and down across the lower chest region on both sides of the chest. The two sides connect at the sternum, or breastbone.

Axial Muscles of the Abdominal Wall and Thorax

Female Chest Muscles Anatomy, Diagram & Function

Breast Anatomy, Tissues, Vessels & Nerves

Definition of breast lobule - NCI Dictionary of Cancer Terms - NCI

The Anatomy of Your Chest Muscles, Explained (and How to Train Them)

Glossary of the Muscular System

Anatomy Lesson: The Chest, Our Powerhouse for Daily Tasks - Goodwin Living

What Are Core Muscles? The Role of Each Core Muscle and Best Exercises

Heart Anatomy Video Medical Video Library

Muscles of the trunk: Anatomy, diagram, pictures

Overview of the Breast - Breast Pathology

Musculoskeletal system: Anatomy and functions

Breast & Thoracic Wall, Anatomy Revision

Human heart: Anatomy, function & facts