Hip Flexors | Rectus Femoris & Iliopsoas [Psoas Major & Iliacus]

The video tutorial provides an in-depth look at the major hip flexors, focusing on the rectus femoris and the iliopsoas muscle group, which includes the SOAS major and iliacus. It explains the mechanics of hip flexion, detailing the activity of these muscles at various degrees of flexion. The anatomy, function, and innervation of the rectus femoris and iliopsoas are discussed, highlighting their roles in hip flexion and knee extension. The tutorial also covers the origins, insertions, and blood supply of these muscles, as well as their antagonists and how to stretch them.

Which muscles are primarily responsible for hip flexion?

• Gluteus maximus and hamstrings

• Rectus femoris and iliopsoas

• Sartorius and gracilis

• Vastus medialis and vastus lateralis

At what degree of hip flexion is the rectus femoris most active?

• 45 degrees

• 0 degrees

• 20 degrees

• 90 degrees

What happens to the activity of the rectus femoris as hip flexion approaches 90 degrees?

• It increases

• It remains constant

• It becomes zero

• It decreases

Where does the rectus femoris insert?

• Tibial tuberosity

• Lesser trochanter

• Ischial tuberosity

• Greater trochanter

Which nerve innervates the rectus femoris?

• Sciatic nerve

• Femoral nerve

• Tibial nerve

• Obturator nerve

What is the primary action of the iliacus muscle?

• Trunk rotation

• Hip flexion

• Hip extension

• Knee flexion

Which artery supplies blood to the iliacus muscle?

• Popliteal artery

• Radial artery

• Deep circumflex iliac artery

• Femoral artery