Knee muscles OIA

Question 1

Biceps femoris long head

Answer 1

O: Ischial tuberosity & Sacrotuberous ligament I: lateral side of head of fibula and lateral condyle of tibia A: flexes and laterally rotates knee, extends hip ( if hip and knee extended, laterally rotates hip)

Question 2

Biceps femoris short head

Answer 2

O: linea aspera and lateral supracondylar ridge I: lateral side of head of fibula and lateral condyle of tibia A: flexes and laterally rotates knee

Question 3

Semimembranosis

Answer 3

O: Iscial tuberosity, may arise from sacrotuberous ligament I: medial condyle of tibia, medial miniscus, oblique politeal ligament A: flexes and medially rotates knee

Question 4

Semitentidonis

Answer 4

O: ischial tuberosity I: upper antero-medial shaft of tibia immediately bellow/post to gracilis A: flexes and medially rotates knee, extends hip (if hip and knee extended, medially rotates hip)

Question 5

Popliteus

Answer 5

O: anterior aspect of lateral condyle of femur, arcuate popliteal ligament, lateral meniscus I: posterior surface of tibia, proximal to soleal line A: in non-weightbearing, medially rotates tibia and flexes knee. In weightbearing, laterally rotates femur and flexes knee

Question 6

Gracilis

Answer 6

O: inferior body of pubis, ramus of pubis and adjacent inferior ramus of ischium I: upper- antero-medial shaft of tibia immediately inferior/posterior to sartorious A: adducts hip,flexes knee. With knee flexed, assists with medial rotation of tibia

Question 7

Sartorious

Answer 7

O: ASIS and immediately bellow I: upper antero-medial shaft of tibia A: flexion, abduction, lateral rotation of hip, flexion of knee, and medial rotation of tibia

Question 8

Gastrocnemius medial head

Answer 8

O: medial condyle and posterior medial popliteal surface of femur I: posterior calcaneus (Achilles) A: plantarflexes ankle and flexes knee

Question 9

Gastrocnemius lateral head

Answer 9

O: lateral condyle of femur I: posterior calcaneus (Achilles) A: plantarflexes ankle and flexes knee

Question 10

Tensor fascia latae

Answer 10

O: outer anterior lip of iliac crest and lateral ASIS I: Iliotibial tract on upper part of thigh A: abduction, medial rotation anf flexion of hip (may assist with knee flexion 45-145 degrees, knee extention last 30 degrees and lateral rotation of tibia) helps stabalize pelvis in standing

Question 11

plantaris

Question 12

Rectus femoris anterior head

Question 13

Vastus lateralis

Question 14

vastus medialis

Question 15

vastus intermedius