knee-muscle.pdfkjhdfks

7/27/2019 knee-muscle.pdfkjhdfks

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THE KNEE JOINT

Muscles That Act On The Knee


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Hamstrings All - flexion B.F. - external rotation

S.T. and S.M - internal rotation Quadriceps

All - extension

Unclassified

Sartorius - flexion and external rotation Gracilis - flexion Popliteus - flexion (unlocking) and internal rotation Gastrocnemius - flexion

Muscles of the Knee Joint


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Anterior Muscles


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Two joint muscle; most superficial

Origin: anterior-inferior iliac spineof the ilium

Insertion: top of the patella andpatellar ligament to the tibialtuberosity

Actions: Extension of the knee

Rectus femoris


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Origin: Lateral lip of lineaaspera.

Insertion: Outer half ofthe upper border of thepatella and the patellar

ligament and the anterior

tuberoscity of the tibia Action:

Extension of the knee

Vastus lateralis


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Origin: Upper 2/3 ofthe anterior surface of

the femur Insertion: Upper border

of the patella and thepatellar ligament

Action:

Extension of the knee

Vastus intermedius


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Origin: Medial lip of thelinea aspera and the

internal condyloid ridge Insertion: Inner half of the

upper border of the patella

nd patellar ligament

Action: Extension of the knee

Vastus medialis


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Quadriceps Muscles


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VL RF VM VL RF VM


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Quadriceps Muscles

1 32

Hamstrings

Vastus LateralisVastus IntermediusRectus FemorisVastus Medialis


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Posterior Knee

Muscles


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Lateral side

Origin:

1.) Long head - ischial tuberosity;

2.) Short head - lower half of the lineaaspera

Insertion: Head of the fibula

Action: Flexion of knee

External rotation of the knee

Biceps femoris


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Medial side; superficial

Origin: Ischial tuberosity

Insertion: Anterior medialsurface of the tibia

Action:

Flexion of the knee Internal rotation of the knee

Semitendinosus


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Medial side, deeper thansemitendonosus

Origin: Ischial tuberosity Insertion: Anterior medial surface ofthe tibia

Action: Flexion of the knee

Internal rotation of the knee

Semimembranosus


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Act more as knee flexors than hip extenders

Hamstring Muscles


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O: Pubis crest I: Anterior medial surface of

the tibia

Actions: flexion at the knee

Gracilis


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Posterior at the knee joint

Origin: Anterior-superior spineof the ilium

Insertion: Anterior medial surfaceof the tibia

Action: Flexion at the knee

Sartorius


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Goose Foot A tendon made up of thesartorius, gracilis, and

semitendonosus

Pes Anserinus


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Origin: Lateral condyle of thefemur

Insertion: Proximal third ofposterior aspect of the tibia


Internal rotation of the knee

Popliteus


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Origin: posterior surfaceof the medial and lateral

femoral condyles

Insertion: the calcaneusthrough the Achillestendon

Actions: Flexion of the knee

Posterior

Gastrocnemius


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Review


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Action: Flexion at theknee

Name the muscle and its action(s)


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1. Anterior cruciate ligament

2. Lateral collateral ligament

3. Lateral meniscus

4. Posterior cruciate ligament

5. Medial collateral ligament

6. Medial meniscus

1.

2.

3.

4.

5.

6.


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Action:

Flexion of the knee



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2. 4.

1.

3

1 = PCL2 = Lateral meniscus

3 = ACL4 = Medial meniscus


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2 = Vastus lateralis

1 = Rectus femoris

4 = Vastus medialis

Name the colored muscles


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? =

? =

? =

Lateral condyleMedial condyle

Intercondylar fossa


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Action - flexion at the knee



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Medial condyle

Lateral condyle

Medial Malleolus

? =? =? =


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1.

2.

3.

1. = Vastus lateralis

2. = Rectus femoris

3. = Vastus medialis

VL RF VM


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VL RF VMVL RF VM


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Actions: Extension of the knee



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1.

2.

3.3.

4.

1. = Anterior cruciate ligament2. = Lateral collateral3. = Lateral meniscus3. = Medial collateral

4. = Medial mieniscus


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Name the muscles.

1.

2.

3.

1 = Vastus lateralis

2 = Vastus intermedius

3 = Vastus medialis


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Head

Lateral malleolus

? =

? =


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1. Biceps femoris

2. Biceps femoris

3. Semitendonosis

4. Semimembranosis


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Action: Flexion of knee



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Medial condyle

Lateral condyle

Medial Malleolus

? =?=? =


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6 = ?

7 = ?

8 = ?

Lateral condyle

Intercondylar fossa

Medial condyle



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Action: Flexion at theknee


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1.

3.

2.

4.

1 = Medial meniscus2 = PCL3 = ACL4 = Lateral meniscus

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knee-muscle.pdfkjhdfks