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THE KNEE JOINT. Muscles That Act On The Knee. Muscles of the Knee Joint. Hamstrings All - flexion Quadriceps All - extension Unclassified Sartorius - flexion and internal rotation Gracilis - flexion and internal rotation Popliteus - flexion (unlocking) and internal rotation

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The knee joint l.jpg

THE KNEE JOINT

Muscles That Act On The Knee


Muscles of the knee joint l.jpg
Muscles of the Knee Joint

  • Hamstrings

    • All - flexion

  • Quadriceps

    • All - extension

  • Unclassified

    • Sartorius - flexion and internal rotation

    • Gracilis - flexion and internal rotation

    • Popliteus - flexion (unlocking) and internal rotation

    • Gastrocnemius - flexion


Anterior muscles l.jpg
Anterior Muscles

  • Quadriceps

    • knee extension



Rectus femoris l.jpg
Rectus femoris

  • Two joint muscle; most superficial

  • Origin: anterior-inferior iliac spine of the ilium

  • Insertion: top of the patella and patellar ligament to the tibial tuberosity

  • Actions:

    • Extension of the knee


Vastus lateralis l.jpg
Vastus lateralis

  • Origin: Lateral lip of linea aspera.

  • Insertion: Outer half of the upper border of the patella and the patellar ligament and the anterior tuberoscity of the tibia

  • Action:

    • Extension of the knee


Vastus intermedius l.jpg
Vastus intermedius

  • Origin: Upper 2/3 of the anterior surface of the femur

  • Insertion: Upper border of the patella and the patellar ligament

  • Action:

    • Extension of the knee


Vastus medialis l.jpg
Vastus medialis

  • Origin: Medial lip of the linea aspera and the internal condyloid ridge

  • Insertion: Inner half of the upper border of the patella nd patellar ligament

  • Action:

    • Extension of the knee


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VL RF VM

VL RF VM


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1

3

2

Hamstrings

Quadriceps

  • Vastus Lateralis

  • Vastus Intermedius

  • Rectus Femoris

  • Vastus Medialis


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QUADRICEPS MUSCLES

  • Vertical jumping

  • Decelerating or eccentric contraction during landing or changing directions

  • As a group, they are typically 25-30% stronger than the hamstrings



Hamstrings l.jpg
Hamstrings

  • knee flexion


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Biceps femoris

  • Lateral side

  • Origin:

    • 1.) Long head - ischial tuberosity;

    • 2.) Short head - lower half of the linea aspera

  • Insertion: Head of the fibula

  • Action:

    • Flexion of knee


Semitendinosus l.jpg
Semitendinosus

  • Medial side; superficial

  • Origin: Ischial tuberosity

  • Insertion: Anterior medial surface of the tibia

  • Action:

    • Flexion of the knee


Semimembranosus l.jpg
Semimembranosus

  • Medial side, deeper than semitendonosus

  • Origin: Ischial tuberosity

  • Insertion: Anterior medial surface of the tibia

  • Action:

    • Flexion of the knee


Hamstring muscles l.jpg
HAMSTRING MUSCLES

  • More “knee flexors” than “hip extenders”

  • Acceleration muscles during running

  • Tight hamstring muscles can contribute to lower back, hip and knee problems


Gracilis l.jpg
Gracilis

  • O: Pubis crest

  • I: Anterior medial surface of the tibia

  • Actions:

    • flexion at the knee


Sartorius l.jpg
Sartorius

  • Posterior at the knee joint

  • Origin: Anterior-superior spine of the ilium

  • Insertion: Anterior medial surface of the tibia

  • Action:

    • Flexion at the knee

    • From Late Latin sartor, tailor (from its producing the cross-legged position of a tailor at work)


Popliteus l.jpg
Popliteus

  • Origin: Lateral condyle of the femur

  • Insertion: Proximal third of posterior aspect of the tibia

  • Action:

    • Flexion of the knee

    • It "unlocks" the knee.

  • Only true knee flexor


Gastrocnemius l.jpg
Gastrocnemius

  • Origin: posterior surface of the medial and lateral femoral condyles

  • Insertion: the calcaneus through the Achilles tendon

  • Actions:

    • Flexion of the knee

Posterior


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Review

  • Superficial Leg Muscles


Sartorius28 l.jpg

Name the muscle and its action(s)

Sartorius

Action: Flexion at the knee


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Q Angle

Valgus

Varus

The deviation between the line of pull of the rectus femoris and the patellar ligament.

Stress to lateral side of the knee

Stress to the medial side of the knee

Terms


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Semimembranosus

Name the muscle and its action(s)

  • Action:

    • Flexion of the knee


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  • Anterior cruciate ligament

  • Lateral collateral ligament

  • Lateral meniscus

  • Posterior cruciate ligament

  • Medial collateral ligament

  • Medial meniscus

1.

2.

3.

4.

5.

6.


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Semitendinosus

Name the muscle and its action(s)

  • Action:

    • Flexion of the knee


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1 = PCL

2 = Lateral meniscus

3 = ACL

4 = Medial meniscus

1.

4.

2.

3


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Name the colored muscles

2 = Vastus lateralis

1 = Rectus femoris

4 = Vastus medialis


Femur l.jpg

? =

? =

? =

Lateral condyle

Medial condyle

Intercondylar fossa

Femur


Gracilis36 l.jpg

Name the muscle and its action(s)

Gracilis

Action - flexion at the knee


Tibia l.jpg

? =? =

? =

Medial condyle

Lateral condyle

Medial Malleolus

Tibia


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2.

3.

1.

  • = Vastus lateralis

  • = Rectus femoris

  • = Vastus medialis


Slide39 l.jpg

VL RF VM

VL RF VM


Rectus femoris40 l.jpg
Rectus femoris

Name the muscle and its action(s)

  • Actions:

    • Extension of the knee


Slide41 l.jpg

1.

2.

3.

3.

4.

1. = Anterior cruciate ligament

2. = Lateral collateral

3. = Lateral meniscus

3. = Medial collateral

4. = Medial mieniscus


Slide42 l.jpg

Name the muscles.

1 = Vastus lateralis

2 = Vastus intermedius

3 = Vastus medialis

1.

2.

3.


Fibula l.jpg
Fibula

? =

? =

Head

Lateral malleolus


Name the muscles l.jpg
Name the muscles

  • Biceps femoris

  • Biceps femoris

  • Semitendonosis

  • Semimembranosis


Biceps femoris45 l.jpg
Biceps femoris

Name the muscle and its action(s)

  • Action:

    • Flexion of knee


Tibia46 l.jpg

Medial condyle

Lateral condyle

Medial Malleolus

Tibia

? =?=

? =


Popliteus47 l.jpg
Popliteus

Name the muscle and its action(s)

  • Action:

    • Flexion of the knee


Femur48 l.jpg

6 = ?

7 = ?

8 = ?

Lateral condyle

Intercondylar fossa

Medial condyle

Femur


Sartorius49 l.jpg

Name the muscle and its action(s)

Sartorius

Action: Flexion at the knee


Slide50 l.jpg

3.

1.

4.

2.

1 = Medial meniscus

2 = PCL

3 = ACL

4 = Lateral meniscus


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