muscles of ant abd wall

1. Anterior abdominal wall
Maj Rishi Pokhrel
Dept of anatomy
NAIHS
www.slideshare.net

2. What makes 6 packs??

3. Bony framework

4. Inguinal
ligament

5. Boundaries & surface division

6. Layers

7. Layers

8. Skin

9. Superficial fascia
• In two layers
• Camper’s - sup fatty layer
• Scarpa’s - deep membranous layer
• CONTENTS
• Cutaneous nerves
• Arteries
• Veins
• Lymphatics

10. Scarpa’s layer

11. Scarpa’s layer

12. Muscles
• External oblique
• Internal oblique
• Transversus abdominis
• Rectus abdominis
• Pyramidalis

13. Linea alba and rectus sheath

14. External oblique
• Origin: external surfaces and inferior
borders of 5-12 ribs with serr ant and
lat dorsi
• Insertion: iliac crest, linea alba, forms
inguinal ligament
• Direction: inferiorly and anteriorly
• Nerve supply: T7 – L1

15. Internal oblique
• Origin: thoracolumbar fascia,
iliac crest, lat 2/3 of inguinal
ligament
• Insertion: pectan pubis
(conjoint tendon), linea alba,
10-12 ribs
• Direction: superiorly and
anteriorly
• Nerve supply: T7 – L1

16. Transversus abdominis
• Origin: thoracolumbar fascia,
Iliac crest, lat ½ of inguinal
ligament, and costal
cartilages 7-12
• Insertion: Xiphoid process,
linea alba, pubic crest and
pecten pubis via conjoint
tendon
• Direction: transverse
• Nerve supply: T6-L1

17. Conjoint tendon

18. Rectus abdominis
• Origin: Pubic crest
• Insertion: costal
cartilage 5-7, xiphoid
process
• Direction: vertical
• Nerve supply: T7-T11
• Tendinous intersections

19. Pyramidalis
• Inconsistent muscle,
within rectus sheath
• Origin: pubic symphysis
and pubic crest
• Insertion: linea alba
• Nerve supply: T12

20. Blood supply

21. Lymphatic
drainage

25. Actions of Muscles of AAW
• Expulsive acts
• Forceful expiratory acts
• Movements of trunk
– Flexion of trunk (lumbar spine)
– Lateral flexion of trunk
– Rotation of trunk
• Muscles of respiration

26. • Support for
abdominal viscera
• Suspension of testis
• Tensing the linea
alba
Actions of Muscles of AAW