| Muscle |
Origin |
Insertion |
Nerve |
Action |
Notes |
| Pectoralis Major |
clavicle, sternum, upper 6 costal cartilages |
lateral
lip of intertubercular groove |
pectoral nerves |
adducts arm, medial rotation of arm, some
flexion |
|
| Sternocleidomastoid |
manubrium, medial
1/3 of clavicle |
mastoid process, occipital bone |
accessory, C3 and C4 |
flex neck, rotate head, support clavicle |
|
| serratus anterior |
upper 8 ribs |
medial
border and inferior angle of scapula |
long thoracic |
draws scapula forward around thoracic wall |
paralysis leads to "winging" of
scapula on affected side |
| pectoralis minor |
ribs 3-5 |
coracoid
process |
median pectoral |
depresses point of shoulder or raises ribs |
|