Muscles That Act on the Knee

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What is the function of the Sartorius?

1. Abducts and rotates thigh laterally 2. Flexes hip and knee (only muscle that flexes both)

Identify the 3 muscles of the Hamstring Group

1. Biceps Femoris 2. Semitendinosus 3. Semimembranosus

What are the 3 muscles in the Hamstring Group?

1. Biceps Femoris 2. Semitendinosus 3. Semimembranousus

What is the function of the Biceps Femoris?

1. Extension of the hip 2. Flexion of the knee

What is the function of the Semimembranosus?

1. Extension of the hip 2. Flexion of the knee

What is the function of the Semitendinosus?

1. Extension of the hip 2. Flexion of the knee

What is the function of the Rectus Femoris?

1. Flexion of hip 2. Extension of knee

What is the origin of the Biceps Femoris?

1. Origin: * Ischial Tuberosity (long head) * Linea Aspera (short head)

What is the origin and insertion of the Rectus Femoris?

1. Origin: Anterior Inferior Iliac Spine (AIIS) 2. Insertion: Patella

What is the origin and insertion of the Vastus Intermedius?

1. Origin: Linea Aspera 2. Insertion: Patella

What is the origin and insertion of the Vastus Lateralis?

1. Origin: Linea Aspera 2. Insertion: Patella

What is the origin and insertion of the Vastus Medialis?

1. Origin: Linea Aspera 2. Insertion: Patella

What are the 3 groups of muscles that act on the knee?

1. Quadriceps Group 2. Hamstring Group 3. Sartorius

Identify the 4 muscles of the Quadriceps Group

1. Rectus Femoris 2. Vastus Lateralis 3. Vastus Medialis 4. Vastus Intermedius

What are the 4 muscles in the Quadriceps Group?

1. Rectus Femoris 2. Vastus Lateralis 3. Vastus Medialis 4. Vastus Intermedius (underneath)

What is the origin of the Sartorius?

Anterior Superior Iliac Spine (ASIS)

What is the function of the Vastus Intermedius?

Extension of the knee

What is the function of the Vastus Lateralis?

Extension of the knee

What is the function of the Vastus Medialis?

Extension of the knee

What is the origin of the Semimembranosus?

Ischial Tuberosity

What is the origin of the Semitendinosus?

Ischial Tuberosity


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