Iliopsoas Flashcards

Explore the iliopsoas muscle group, including its components, lumbar and iliac attachments, innervation, hip flexion, and anatomical relationships.

Card 1 of 30Question

Which two principal muscles form the iliopsoas?

Psoas major and iliacus.

In This Section

1. Which two principal muscles form the iliopsoas?

Psoas major and iliacus.

2. What is the primary function of the iliopsoas muscle group?

Flexion of the thigh at the hip joint.

3. Where is the psoas major muscle located?

Along the lateral sides of the lumbar vertebral column, extending into the pelvis and anterior hip.

4. Where is the iliacus muscle located?

Within the iliac fossa on the internal surface of the ilium.

5. What is the vertebral origin of psoas major?

The bodies, intervertebral discs, and transverse processes of T12 through L5, with attachments varying by level.

6. Which lumbar vertebral structures provide attachment to the deep fibers of psoas major?

The transverse processes of the lumbar vertebrae.

7. What is the principal bony origin of iliacus?

The superior two-thirds of the iliac fossa.

8. Which pelvic structures provide additional attachments for iliacus?

The iliac crest, anterior sacroiliac ligaments, and adjacent ala of the sacrum.

9. Where does the iliopsoas primarily insert?

The lesser trochanter of the femur.

10. How do psoas major and iliacus unite distally?

Their fibers converge into a common musculotendinous insertion near the lesser trochanter.

11. Which nerve supplies the psoas major?

Direct branches from the anterior rami of lumbar spinal nerves L1 to L3, sometimes with L4 contributions.

12. Which nerve supplies the iliacus?

The femoral nerve.

13. Which spinal nerve roots contribute to the femoral nerve supplying iliacus?

L2, L3, and L4.

14. Which arteries contribute to the blood supply of psoas major?

Lumbar arteries and branches of the iliolumbar artery.

15. Which arteries contribute to the blood supply of iliacus?

The iliolumbar artery and branches of the deep circumflex iliac and femoral arterial systems.

16. Which veins drain the iliopsoas region?

Lumbar, iliolumbar, and femoral venous tributaries, depending on the muscle region.

17. Through which opening does the iliopsoas pass from the pelvis into the anterior thigh?

The muscular lacuna beneath the inguinal ligament.

18. What is the relationship of the iliopsoas to the femoral triangle?

It forms the lateral portion of the floor of the femoral triangle.

19. Which major nerve emerges along the lateral border of psoas major?

The femoral nerve.

20. Where does the femoral nerve travel in relation to psoas major and iliacus?

It descends in the groove between the two muscles before passing beneath the inguinal ligament.

21. Which major nerve runs along the anterior surface of psoas major?

The genitofemoral nerve.

22. What is the relationship between psoas major and the lumbar plexus?

Most of the lumbar plexus forms within the posterior portion of psoas major.

23. Which bursa lies between the iliopsoas tendon and the anterior hip joint capsule?

The iliopsoas bursa, also called the iliopectineal bursa.

24. What is the function of the iliopsoas when the femur is fixed?

It assists trunk flexion at the hip and can help stabilize the lumbar spine.

25. What additional hip movement can the iliopsoas assist?

Lateral rotation of the thigh.

26. Which anatomical movement commonly becomes limited with iliopsoas shortening?

Hip extension.

27. What is the psoas sign in clinical examination?

Pain elicited by stretching or contracting psoas major, potentially indicating irritation near the muscle.

28. What is an iliopsoas abscess?

A collection of pus within the iliopsoas muscle compartment.

29. Which anatomical structure may become irritated during iliopsoas tendinopathy or internal snapping hip syndrome?

The iliopsoas tendon as it moves across anterior hip structures.

30. Which accessory muscle may accompany psoas major as an anatomical variation?

Psoas minor, a variable muscle that is absent in many individuals.