Knee Muscles

Question 1

Rectus Femoris

Answer 1

Origin - Anterior Inferior iliac spine (AIIS)
Insertion - Patella thru the patella tendon to the tibial tuberosity
Action - Hip Flexion, Knee Extension
Innervation - Femoral Nerve
Blood Supply - Superficial Femoral Artery

Question 2

Vastus Lateralis

Answer 2

Origin - Greater Trochanter and Lateral Lip of the Linea Aspera
Insertion - Patella thru the patella tendon to the tibial tuberosity
Action - Extend Knee
Innervation - Femoral Nerve
Blood Supply - Superficial Femoral artery

Question 3

Vastus Medialis

Answer 3

Origin - Medial lip of the Linea Aspera
Insertion - Patella thru the patella tendon to the tibial tuberosity
Action - Extends Knee
Innervation - Femoral Nerve
Blood Supply - Superficial Femoral Artery and Deep Femoral Artery

Question 4

Vastus Intermedius

Answer 4

Origin - Anterior and Lateral Femoral Shaft
Insertion - Patella thru the patella tendon to the tibial tuberosity
Action - extend knee
Innervation - Femoral nerve
Blood Supply - Deep Femoral Artery

Question 5

Articularious Genu

Answer 5

Origin - Anterior Distal Femoral Shaft
Insertion - Knee Joint Capsule
Action - Tenses and pulls the joint capsule proximally during extension

Question 6

Long Head Bicep Femoris

Answer 6

Origin - Ischial Tuberosity
Insertion - Head of the Fibula
Action - Flex Knee, Rotate Knee, Extend Hip
Innervation - Tibial Nerve
Blood Supply - Deep Femoral Artery

Question 7

Short Head Bicep Femoris

Answer 7

Origin - Linea Aspera
Insertion - Head of Fibula
Action - Flex Knee, Rotate Knee
Innervation- Tibial Nerve
Blood Supply - Deep Femoral Artery

Question 8

Semimembranosus

Answer 8

Origin - Ischial Tuberosity
Insertion - Medial Posterior Condyle of Tibia
Action - Hip Extension, Flex Knee, Medial Rotate
Innervation - Tibial Nerve
Blood Supply - Deep Femoral and Popliteal

Question 9

Semitendinosus

Answer 9

Origin - Ischial Tuberosity
Insertion - Pes Anserine
Action - Extend hip, Flex Knee, Medial Rotate Knee
Innervation - Tibial Nerve
Blood Supply - Deep Femoral and Popliteal Artery

(Superior to semimembranosus)

Question 10

Popliteus

Answer 10

Origin - Lateral Femoral Condyle
Insertion - Proximal 1/3 of Posterior Tibia
Action - Medial Rotate of Tibia on Femur
Innervation - Tibial Nerve
Blood Supply - Popliteal Artery