Origin and insertion
- Origin (O): The muscle originates from the anterior inferior iliac spine and the superior margin of the acetabulum. By origin, it is biceps.
- Insertion (I): Via a common tendon, it inserts into the patella (patella), and further via the patellar ligament (lig. patellae) into the tibial tuberosity.
Functions and reflexes
- Movement: The rectus femoris muscle flexes the hip at the hip joint and extends the knee through the common quadriceps mechanism.
- Reflexes: The knee-jerk reflex corresponds to spinal levels L2–L4 and is mediated by the femoral nerve (n. femoralis).
Topography and fascial compartments
- Location: Situated in the anterior region of the thigh. In a cross-section of the upper third of the thigh, it belongs to the anterior group of muscles.
- Fascial apparatus: The fascia lata (fascia lata) forms a sheath for m. rectus femoris. The anterior compartment is separated from the medial compartment by the medial intermuscular septum of the thigh (septum intermusculare femoris mediale), and from the posterior compartment by the lateral intermuscular septum of the thigh (septum intermusculare femoris laterale).
- Syntopy: Within the anterior compartment, it lies alongside the vastus muscles of the thigh: vastus lateralis (m. vastus lateralis), vastus medialis (m. vastus medialis), and vastus intermedius (m. vastus intermedius). On anatomical diagrams, the rectus femoris muscle may be partially removed or cut to visualize deep structures.
Relation to blood vessels
The rectus femoris muscle serves as a topographical landmark for the branches of the lateral femoral circumflex artery (a. circumflexa femoris lateralis):
- Ascending branch (r. ascendens) runs between the sartorius muscle (m. sartorius) and the rectus femoris muscle (m. rectus femoris), coursing superiorly and laterally into the gluteal region.
- Descending branch (r. descendens) runs inferiorly between the rectus femoris muscle (m. rectus femoris) and the vastus intermedius muscle (m. vastus intermedius), reaching the articular network of the knee.
Blood supply, innervation, and clinical notes
- Blood supply: a. femoralis, a. circumflexa femoris lateralis, a. profunda femoris.
- Innervation: n. femoralis.
- Clinical significance: In adolescents, an avulsion fracture (avulsion) of the anterior inferior iliac spine—the origin site of m. rectus femoris—may occur. Pus accumulation within m. rectus femoris has also been described.
Class and exam questions
Which fascial compartment does the rectus femoris muscle belong to?
It belongs to the anterior fascial compartment of the thigh (compartimentum femoris anterius).
Which blood vessels run close to the rectus femoris muscle?
The ascending branch of the lateral femoral circumflex artery runs between it and the sartorius muscle. The descending branch of the same artery runs between it and the vastus intermedius muscle.
What is the unique feature of the origin of the rectus femoris muscle?
It originates from the anterior inferior iliac spine and the superior margin of the acetabulum, being biceps by origin.
What injuries are characteristic of the origin site of this muscle?
In adolescents, an avulsion (avulsion) of the anterior inferior iliac spine—the origin site of m. rectus femoris—can occur.
What else to study on this topic
- Quadriceps femoris muscle (m. quadriceps femoris)
- Femoral nerve (n. femoralis)
- Lateral femoral circumflex artery (a. circumflexa femoris lateralis)
- Fascia lata of the thigh (fascia lata)
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