Pelvis & Thigh

Question 1

Rectus Femoris

Answer 1

•ACTION
Extend the knee
Flex the hip
•ORIGIN
Anterior inferior iliac spine (AIlS)
•INSERTION
Tibial tuberosity (via the patella and patellar ligament)
•NERVE
Femoral L2, 3, 4

Question 2

Vastus Medialis

Answer 2

•ACTION
Extend the knee
•ORIGIN
Medial lip of linea aspera
•INSERTION
Tibial tuberosity (via the patella and patellar ligament)
•NERVE
Femoral L2, 3, 4

Question 3

Vastus Lateralis

Answer 3

•ACTION
Extend the knee
•ORIGIN
Lateral lip of linea aspera, gluteal tuberosity, and greater trochanter
•INSERTION
Tibial tuberosity (via the patella and patellar ligament)
•NERVE
Femoral L2, 3, 4

Question 4

Vastus Intermedius

Answer 4

•ACTION
Extend the knee
•ORIGIN
Anterior and lateral shaft of the femur
•INSERTION
Tibial tuberosity (via the patella and patellar ligament)
•NERVE
Femoral L2, 3, 4

Question 5

Biceps Femoris

Answer 5

•ACTION
Flex the knee
Laterally rotate the flexed knee
Long head:
Extend the hip (coxal joint)
Long head:
Assist to laterally rotate the hip (coxal joint)
Tilt the pelvis posteriorly
•ORIGIN
Long head: Ischial tuberosity
Short head: Lateral lip of linea aspera
•INSERTION
Head of the fibula
•NERVE
Long head: Sciatic (tibial branch) L5, S1, 2, 3
Short head: Sciatic (fibular branch) L5, S1, 2

Question 6

Semitendinosus

Answer 6

•ACTION
Flex the knee
Medially rotate the flexed knee
Extend the hip
Assist to medially rotate the hip
Tilt the pelvis posteriorly
•ORIGIN
Ischial tuberosity
•INSERTION
Proximal, medial shaft of the tibia at pes anserinus tendon
•NERVE
Sciatic (tibial branch) L4, 5, S1, 2

Question 7

Semimembranosus

Answer 7

•ACTION
Flex the knee
Medially rotate the flexed knee
Extend the hip
Assist to medially rotate the hip
Tilt the pelvis posteriorly
•ORIGIN
Ischial tuberosity
•INSERTION
Posterior aspect of medial condyle of tibia
•NERVE
Sciatic (tibial branch) L4, 5, S1, 2

Question 8

Gluteus Maximus

Answer 8

•ACTION
All fibers:
Extend the hip
Laterally rotate the hip
Abduct the hip
Lower fibers:
Adduct the hip
•ORIGIN
Coccyx, edge of sacrum, posterior iliac crest, sacrotuberous and sacroiliac ligaments
•INSERTION
liotibial tract (upper fibers) and gluteal tuberosity (lower fibers)
•NERVE
Inferior gluteal L5, S1, 2

Question 9

Gluteus Medius

Answer 9

•ACTION
All fibers:
Abduct the hip
Anterior fibers:
Flex and Medially rotate the hip
Posterior fibers:
Extend and Laterally rotate the hip
•ORIGIN
Gluteal surface of ilium, between posterior and anterior gluteal lines, just below the iliac crest
•INSERTION
Lateral aspect of greater trochanter
•NERVE
Superior gluteal L4, 5, S1

Question 10

Gluteus Minimus

Answer 10

•ACTION
Abduct, Medially rotate, Flex the hip
•ORIGIN
Gluteal surface of the ilium between the anterior and inferior gluteal lines
•INSERTION
Anterior aspect of greater trochanter
•NERVE
Superior gluteal L4, 5, S1

Question 11

Adductor Magnus

Answer 11

•ACTION
Adduct and Medially rotate the hip
Assist to flex the hip
Posterior fibers:
Extend the hip
•ORIGIN
Inferior ramus of the pubis, ramus of ischium, and ischial tuberosity
•INSERTION
Medial lip of linea aspera and adductor tubercle
•NERVE
Obturator L2, 3, 4 and sciatic L4, 5, S1

Question 12

Adductor Longus

Answer 12

•ACTION
Adduct and Medially rotate the hip
Assist to flex the hip
•ORIGIN
Pubic tubercle
•INSERTION
Medial lip of linea aspera
•NERVE
Obturator L2, 3, 4

Question 13

Adductor Brevis

Answer 13

•ACTION
Adduct and Medially rotate the hip
Assist to flex the hip
•ORIGIN
Inferior ramus of pubis
•INSERTION
Pectineal line and medial lip of linea aspera
•NERVE
Obturator L2, 3,4

Question 14

Pectineus

Answer 14

•ACTION
Adduct and Medially rotate the hip
Assist to flex the hip
•ORIGIN
Superior ramus of pubis
•INSERTION
Pectineal line of femur
•NERVE
Femoral and obturator L2, 3, 4