Rectus femoris muscle

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Rectus_femoris.png

== Rectus Femoris Muscle ==

The rectus femoris muscle is one of the four quadriceps femoris muscles, located in the anterior compartment of the thigh. It is unique among the quadriceps muscles because it crosses both the hip joint and the knee joint, making it a biarticular muscle.

Anatomy

The rectus femoris muscle originates from two tendons:

• The straight head originates from the anterior inferior iliac spine (AIIS).
• The reflected head originates from the ilium just above the acetabulum.

The muscle fibers converge into a single tendon that inserts into the patella and continues as the patellar ligament to attach to the tibial tuberosity.

Function

The primary functions of the rectus femoris muscle are:

• Flexion of the hip joint.
• Extension of the knee joint.

Because it crosses both the hip and knee joints, the rectus femoris muscle plays a crucial role in activities such as walking, running, and jumping.

Innervation

The rectus femoris muscle is innervated by the femoral nerve, which arises from the lumbar plexus (L2-L4).

Blood Supply

The blood supply to the rectus femoris muscle is primarily provided by the lateral circumflex femoral artery, a branch of the deep femoral artery.

Clinical Significance

Injuries to the rectus femoris muscle can occur due to overuse or trauma. Common injuries include:

• Strains or tears.
• Tendinitis.

These injuries are often seen in athletes who engage in activities that involve repetitive knee extension and hip flexion.

See Also

• Quadriceps femoris muscle
• Vastus lateralis muscle
• Vastus medialis muscle
• Vastus intermedius muscle
• Femoral nerve
• Patellar ligament