Muscles That Act on the Knee
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
