Abdominal Wall Flashcards

Explore abdominal wall layers, muscles, fascial structures, neurovascular supply, anatomical landmarks, and clinical relationships.

Card 1 of 30Question

What are the primary functions of the abdominal wall?

To protect abdominal viscera, support intra-abdominal pressure, stabilize the trunk, and assist trunk movement and forced expiration.

In This Section

1. What are the primary functions of the abdominal wall?

To protect abdominal viscera, support intra-abdominal pressure, stabilize the trunk, and assist trunk movement and forced expiration.

2. What are the principal layers of the anterolateral abdominal wall from superficial to deep?

Skin, superficial fascia, muscles and aponeuroses, transversalis fascia, extraperitoneal tissue, and parietal peritoneum.

3. What are the three flat muscles of the anterolateral abdominal wall?

External oblique, internal oblique, and transversus abdominis.

4. Which paired vertical muscle forms much of the anterior abdominal wall near the midline?

The rectus abdominis.

5. Which small, variable muscle lies anterior to the inferior part of the rectus abdominis?

The pyramidalis muscle.

6. What is the primary fiber direction of the external oblique muscle?

Inferomedial, resembling the direction of hands placed in front pockets.

7. What is the predominant fiber direction of the internal oblique muscle?

Superomedial, although its fibers have varying orientations.

8. What is the predominant fiber direction of the transversus abdominis muscle?

Approximately horizontal, passing transversely around the abdominal wall.

9. What is the principal action of the rectus abdominis muscle?

Flexion of the trunk, with additional stabilization of the pelvis.

10. What is the main stabilizing function of the transversus abdominis?

Compression of abdominal contents and contribution to trunk stability.

11. What are the two layers of superficial fascia in the lower anterior abdominal wall?

Camper's fatty layer and Scarpa's membranous layer.

12. What is the transversalis fascia?

A layer of endoabdominal fascia lining the deep surface of the transversus abdominis muscle.

13. What is the linea alba?

A midline fibrous raphe formed by interlacing aponeurotic fibers between the xiphoid process and pubic symphysis.

14. What is the linea semilunaris?

The curved tendinous line marking the lateral border of the rectus abdominis muscle.

15. What forms the rectus sheath?

The aponeuroses of the external oblique, internal oblique, and transversus abdominis muscles.

16. How does the internal oblique aponeurosis contribute to the rectus sheath above the arcuate line?

It divides into anterior and posterior laminae that pass around the rectus abdominis.

17. Which aponeuroses pass anterior to the rectus abdominis below the arcuate line?

All three flat abdominal muscle aponeuroses.

18. What is the arcuate line of the rectus sheath?

The inferior limit of the posterior aponeurotic layer of the rectus sheath.

19. Which major arteries supply the rectus abdominis muscle?

The superior and inferior epigastric arteries.

20. From which artery does the superior epigastric artery originate?

The internal thoracic artery.

21. From which artery does the inferior epigastric artery originate?

The external iliac artery.

22. Which spinal nerve levels provide most of the motor innervation to the anterolateral abdominal wall?

Thoracoabdominal nerves T7 to T11, the subcostal nerve T12, and contributions from L1.

23. Between which two muscles does the main neurovascular plane of the anterolateral abdominal wall lie?

Between the internal oblique and transversus abdominis muscles.

24. Which spinal nerve level supplies the dermatome at the umbilicus?

T10.

25. What forms the inguinal ligament?

The thickened, folded inferior border of the external oblique aponeurosis.

26. What forms the deep inguinal ring?

An opening in the transversalis fascia, lateral to the inferior epigastric vessels.

27. What forms the superficial inguinal ring?

A triangular opening in the external oblique aponeurosis above the pubic tubercle.

28. How does an indirect inguinal hernia relate to the inferior epigastric vessels?

It passes lateral to the vessels through the deep inguinal ring.

29. How does a direct inguinal hernia relate to the inferior epigastric vessels?

It protrudes medial to the vessels through the posterior wall of the inguinal canal.

30. What is a Spigelian hernia?

A hernia through the Spigelian fascia near the linea semilunaris, often close to the arcuate line.