rectus femoris


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rectus femoris

a fusiform muscle of the anterior thigh, one of the four parts of the quadriceps femoris. With the quadriceps group it functions to extend the lower leg. Compare vastus intermedius, vastus lateralis, vastus medialis. See also quadriceps femoris.
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Rectus femoris
The Q-angle.

quadriceps femoris

(commonly known as quads) muscle group on the front of the thigh comprising lateral, intermediate and medial vasti (all contributing to knee extension, with origin from the shaft of the femur) and rectus femoris (contributing also to hip flexion, by its origin from the ilium of the pelvis). Parts of the vasti are inserted into the top and sides of the patella, and contribute tendinous reinforcements to the joint capsule of the knee. The four muscles converge onto the single quadriceps tendon which spans the front of the knee to be inserted as the patellar tendon (ligament) into the tibial tubercle (tuberosity). See also patella, Q(quadriceps)-angle.

rectus femoris

two-headed (straight and reflected) muscle within quadriceps femoris group; lies between iliopsoas and tensor fascia lata superiorly and vastus lateralis and medialis inferiorly, and overlying vastus intermedius
  • origin straight head from anterior inferior iliac spine; reflected head from acetabulum area

  • insertion common patellar tendon, with vasti tendons

  • nerve supply femoral nerve

  • action knee extension and hip flexion

References in periodicals archive ?
On further analysis of the muscle activation, it was found that Gluteus maximus and Rectus Femoris are the two most important contributors of torque that is generated.
92%, respectively), while vastus lateralis, adductor and rectus femoris muscles had the lowest (1.
B (brightness) mode ultrasonography of the right and left rectus femoris was carried out in 10 nondisabled subjects during a single session by a novice operator (K.
1]) RF: rectus femoris, VL: vastus lateralis, EMD: electromechanical delay.
One likely possibility is that you have irritated either the rectus femoris tendon or one of the surrounding bursae (protective fluid sac).
Delsys Trigno wireless electromyography (EMG) surface electrodes (Delsys Inc; Boston, Massachusetts) were attached to the TA, rectus femoris (RF), medial gas-trocnemius (MG), and biceps femoris (BF) muscles of the right leg.
Surface EMG was used to record the signals from the rectus femoris, vastus medialis, vastus lateralis muscles, semitendinousus and biceps femoris muscles in different conditions of WBV.
And Inter confirmed that "tests have shown he has pulled the rectus femoris muscle in his left leg".
The latter three originate at the top of the femur (thigh bone) and attach to the kneecap; the rectus femoris originates on the hip, making it the only quad muscle that crosses both the hip and knee joints.
The second peak in the PFJRF during early swing can be attributed to the fact the knee is rapidly flexing and rectus femoris is active as a hip flexor during this phase of the gait cycle.
Furthermore, additional analysis was conducted on vastus medialis and rectus femoris muscle activities because of their functional differences in skiing (Kroll et al.

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