1. Muscles of the Trunk

2. Muscles of the Trunk: AKA “The Core”

3. Anterior Core Muscles: Front
Rectus Abdominis
External Oblique
Internal Oblique
Transverse Abdominis

4. Rectus Abdominis O: Costocartilage & Xiphoid Process
I: Pubic crest & Symphysis (Pelvis)
A: Flexes Spine

5. External Oblique Outermost muscles of trunk
Fibers run like hands in pockets
O: Ribs 5-12
I: Anterior pelvis
A: Flexes and rotates spine

6. Internal Oblique
O: Anterior pelvis I: Cartilage of ribs 8-12 A: Flexes and rotates spine

7. Transversus Abdominis
Deepest layer of abdominal muscle
Fibers run horizontally
A: Stabilize the pelvis!

8. Posterior Core Muscles: Back
Erector Spinae
Multifidus

9. Erector Spinae O: Sacrum
At lumbar level it splits into three columns, each of which with 3 parts
A: Extends spine

10. Multifidus Located on both sides of your spine
Run from your pelvis and low back all the way to your neck: each muscle spans 2-4 vertebrae
A: Work with transversus abdominis to stabilize pelvis

11. Core Stability
Transverse Abdominis=The Corset
Multifidus=The Laces