Actions, Origins, & Insertions.
Internal Abdominal Oblique
Action- Tenses abdominal wal & compresses abdominal contents
Origin- Illium
Insertion- Cartilages of lower ribs
Origin- Illium
Insertion- Cartilages of lower ribs
External Abdominal Oblique
Action- Tenses abdominal wall & compresses adbominal contents
Origin- Ribs 5-12
Insertion- Illium
Origin- Ribs 5-12
Insertion- Illium
Rectus Abdominis.
Action- Flexion of vertebral column
Origin- Pubis
Insertion- Sternum
Origin- Pubis
Insertion- Sternum
Serratus Anterior.
Action- Protracts (abducts) & rotates scapula (upward rotation-raising arm); Elevates ribs (secondary)
Origin- Ribs 1-8
Insertion- Scapula
Origin- Ribs 1-8
Insertion- Scapula
Pectoralis Major.
Action- Flexes, adducts, & rotates arm medially
Origin- Clavicle, sternum, & costal cartilages of upper ribs
Insertion- Humerus
Origin- Clavicle, sternum, & costal cartilages of upper ribs
Insertion- Humerus
Pectoralis Minor.
Action- Draws scapula forward & downward; Elevates ribs
Origin- Ribs 3-5
Insertion- Scapula (coracoid process)
Origin- Ribs 3-5
Insertion- Scapula (coracoid process)