Chest/Back muscles

Latissimus Dorsi

Adduction, medial rotation, extension of the arm

Serratus Posterior

Spinal movement

Gluteus Maximus

Supporting trunk of body, stabilizes during walking

Gluteus Medius

Stabilizes pelvis

Teres Major

Minor is apart of rotator cuff

Extending, abducting, internally rotated at shoulder joint

Infraspinatus

Part of rotator cuff

Rotation of humerus and stabilizing shoulder joint

Deltoid (back)

Abduction

Rhomboideus Major

Stabilize and move scapula, retracts and elevates shoulder blade, and rotates scapula downward

Trapezius

Control scapula movement, neck extension, and posture

Triceps Brachii

Elbow extension

Levator Scapulae

Elevates and rotates scapula

Splenius Calitis

Neck extensions, lateral flexion, rotation

Supraspinatus

Part of rotator cuff (rotation and stabilization)

Deltoid (Chest)

Abduction

Serrarus Anterior

Scapular protraction and upward rotation to enable arm movements and overhead lifting, and assisting in respiration

Pectoralis

Adducting, medically rotating, and flexing the arm

External Oblique

Twisting the trunk of the body to the opposite side, bending the trunk to the same sides flexing the trunk forward, and compressing the abdomen to assist in forced expiration and increase intraabdominal pressure

Rectus Abdominis

Trunk flexion, spinal stabilization, and the maintenance of intra-abdominal pressure for breathing and digestion

Sternocleidomastoid

Head and neck flexion, rotation, and stabilization, also playing a role in breathing by elevating the clavicle and sternum

Pectoralis minor

Stabilize the scapula against the chest wall by pulling it forward and downward. Also elevates ribs when shoulder girdle is fixed in respiration

Transversus Abdominis

Stabilize trunk, compress abdominal organs, supports pelvis and spine

Internal oblique

Trunk flexion, lateral flexion, and rotation