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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

THE KNEE JOINT

Muscles That Act On The Knee

muscles of the knee joint
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
Anterior Muscles
  • Quadriceps
    • knee extension
rectus femoris
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
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
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
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
slide10

VL RF VM

VL RF VM

slide11

1

3

2

Hamstrings

Quadriceps

  • Vastus Lateralis
  • Vastus Intermedius
  • Rectus Femoris
  • Vastus Medialis
quadriceps muscles12
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
Hamstrings
  • knee flexion
biceps femoris
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
Semitendinosus
  • Medial side; superficial
  • Origin: Ischial tuberosity
  • Insertion: Anterior medial surface of the tibia
  • Action:
    • Flexion of the knee
semimembranosus
Semimembranosus
  • Medial side, deeper than semitendonosus
  • Origin: Ischial tuberosity
  • Insertion: Anterior medial surface of the tibia
  • Action:
    • Flexion of the knee
hamstring muscles
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
Gracilis
  • O: Pubis crest
  • I: Anterior medial surface of the tibia
  • Actions:
    • flexion at the knee
sartorius
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
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
Gastrocnemius
  • Origin: posterior surface of the medial and lateral femoral condyles
  • Insertion: the calcaneus through the Achilles tendon
  • Actions:
    • Flexion of the knee

Posterior

review
Review
  • Superficial Leg Muscles
terms
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
semimembranosus30
Semimembranosus

Name the muscle and its action(s)

  • Action:
    • Flexion of the knee
slide31
Anterior cruciate ligament
  • Lateral collateral ligament
  • Lateral meniscus
  • Posterior cruciate ligament
  • Medial collateral ligament
  • Medial meniscus

1.

2.

3.

4.

5.

6.

semitendinosus32
Semitendinosus

Name the muscle and its action(s)

  • Action:
    • Flexion of the knee
slide33

1 = PCL

2 = Lateral meniscus

3 = ACL

4 = Medial meniscus

1.

4.

2.

3

name the colored muscles
Name the colored muscles

2 = Vastus lateralis

1 = Rectus femoris

4 = Vastus medialis

femur
? =

? =

? =

Lateral condyle

Medial condyle

Intercondylar fossa

Femur
gracilis36

Name the muscle and its action(s)

Gracilis

Action - flexion at the knee

tibia

? =? =

? =

Medial condyle

Lateral condyle

Medial Malleolus

Tibia
slide38

2.

3.

1.

  • = Vastus lateralis
  • = Rectus femoris
  • = Vastus medialis
slide39

VL RF VM

VL RF VM

rectus femoris40
Rectus femoris

Name the muscle and its action(s)

  • Actions:
    • Extension of the knee
slide41

1.

2.

3.

3.

4.

1. = Anterior cruciate ligament

2. = Lateral collateral

3. = Lateral meniscus

3. = Medial collateral

4. = Medial mieniscus

slide42

Name the muscles.

1 = Vastus lateralis

2 = Vastus intermedius

3 = Vastus medialis

1.

2.

3.

fibula
Fibula

? =

? =

Head

Lateral malleolus

name the muscles
Name the muscles
  • Biceps femoris
  • Biceps femoris
  • Semitendonosis
  • Semimembranosis
biceps femoris45
Biceps femoris

Name the muscle and its action(s)

  • Action:
    • Flexion of knee
tibia46
Medial condyle

Lateral condyle

Medial Malleolus

Tibia

? =?=

? =

popliteus47
Popliteus

Name the muscle and its action(s)

  • Action:
    • Flexion of the knee
femur48
6 = ?

7 = ?

8 = ?

Lateral condyle

Intercondylar fossa

Medial condyle

Femur
slide50

3.

1.

4.

2.

1 = Medial meniscus

2 = PCL

3 = ACL

4 = Lateral meniscus

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