Learn The Human Muscles - Upper Body

The pectoralis major is the primary muscle involved in moving the arm across the chest, while the deltoid primarily assists in raising the arm to the side, the biceps brachii is responsible for flexion of the elbow, and the triceps brachii is responsible for extension of the elbow.

The pectoralis minor is a thin, triangular muscle located underneath the larger pectoralis major muscle in the chest area. It helps in the movement of the shoulder blade.

The trapezius muscle is a large muscle that extends longitudinally from the occipital bone to the lower thoracic vertebrae and laterally to the spine of the scapula. It is responsible for moving the scapula and supporting the arms in various movements.

The biceps brachii is a muscle that runs along the front of the upper arm and is responsible for bending the elbow.

The triceps brachii muscle is located at the back of the upper arm and is responsible for extending the elbow. It consists of three heads - long head, lateral head, and medial head. The biceps brachii is located at the front of the upper arm and is responsible for flexing the elbow. The deltoid muscle is located at the shoulder region and is responsible for shoulder abduction. The pectoralis major is located at the chest region and is responsible for shoulder adduction and flexion.

The Latissimus Dorsi, also known as the 'lats', is a large, flat muscle that stretches to the sides and behind the arm. It is responsible for multiple movements of the shoulder joint.

The intercostal muscles are located between the ribs and aid in the breathing process by helping the chest expand and contract. The deltoids are found in the shoulders, the quadriceps are in the thighs, and the trapezius is in the upper back.

The transversus abdominis muscle plays a key role in providing stability to the spine and pelvis by creating an internal girdle that supports the core. While other muscles like rectus abdominis, external oblique, and internal oblique also contribute to core strength, transversus abdominis is particularly important for stabilizing the spine and pelvis during movement.

Abdominal crunches specifically target the rectus abdominus muscle, commonly known as the 'abs', to strengthen and tone the core.

The Internal Oblique muscle is responsible for rotating the trunk and bending it laterally. Rectus Abdominis primarily flexes the trunk, External Oblique helps in twisting the trunk, and Transversus Abdominis provides core stability.

The external oblique muscle is one of the outermost abdominal muscles and is responsible for trunk rotation and lateral flexion of the spine. It is situated on the lateral and anterior parts of the abdomen.