CHEST

Pectoralis Major

O: Sternum; median ventral raphe
I: Pectoral ridge on ventral side of humerus
A: Adduction of the arm (pulling toward the chest) Posterior fibers: Retraction (pulling the arm back)

Pectoralis Minor

O: Sternum
I: Ventral side of the humerus (proximal to origin of p. major)
A: Stabilizes scapula by drawing it inferiorly and anteriorly against the thoracic wall

External Oblique

O: Lumbodorsal fascia; posterior ribs
I: Linea alba white line located at the midline of the trunk region pinakagitna na line
(medial)
A: Constrict the abdomen

serratus anterior/ventralis

O: First nine or ten ribs or their cartilages
I: medial border of Scapula
A: draws the scapula forward; Protracts and rotates scapula, assists in arm elevation

Rectus Abdominis

O: pubis
I: Sternum; costal cartilages
A: Constrict the abdomen; retract the sternum and
ribs curl ups or sit ups constrict the abdomen (exercise)