Chest Muscles

Chest Muscles

Chest (pec major)

• adducts the arm (pencil dive)

• medially rotates the humerus (applying deodorant to opposite armpit)

• obliquely adducts the humerus toward the opposite hip (unsheathing a sword)

Chest (pec minor)

• depresses and stabilizes the scapula

Serratus Anterior

• helps raise the upper arm

• protracts scapula

Rectus Abdomonis

• flexes lumbar spine

• depresses ribcage

• stabilizes pelvis during walking

External Obliques

• twisting the torso to the opposite side

• bends the trunk laterally to that side

• contributes to core stability 

Internal Obliques

• twisting the torso to the same side

• lateral flexion

• contracting to flex the trunk 

Transverse Abdomonis

• increase intra-abdominal pressure, which aids in forceful actions like coughing 

• provides stability to your spine, core and pelvis  

Diaphragm

• forms the floor of the thoracic cavity

• controls breathing by contracting and relaxing to pull air into and push air out of the lungs

• separates the thoracic cavity from the abdominal cavity