Muscle | Origin | Insertion | Action |
rectus abdominis | pubic crest and symphysis | cartilage of 5 to 7 ribs and xyphoid process | flex vertebral column and compress abdomen |
external oblique | inferior 8 ribs | iliac crest and linea alba | flex vertebral column and compress abdomen
laterally flex and rotate vertebral column |
internal oblique | iliac crest and inguinal ligament | cartilage of last 4 ribs and linea alba | flex vertebral column and compress abdomen
laterally flex and rotate vertebral column |
transversus abdominis | iliac crest and inguinal ligament | xyphoid process, linea alba and pubis | compress abdomen |
inguinal ligament | anterior superior iliac spine | pubic tubercle | (blank) |
external intercostals | inferior border of rib above | superior border of rib below | contraction increases rib cage dimentions |
internal intercostals | superior border of rib below | inferior border of rib above | contraction decreases rib cage dimentions |
diaphragm | xyphoid process of sternum and adjacent ribs | central tendon | contraction increases rib cage dimentions |
serratus anterior | ribs | scapula | stabilize, abduct and rotate scapula |
latissimus dorsi | ribs | intertubercular sulcus of humerus | extend, adduct and medially rotate arm at shoulder |