Anterior, Posterior and Medial Thigh Muscles

Question 1

Rectus femoris (anterior)

Answer 1

Origin - Ilium superior to acetabulum

Insertion - patella

Innervation - Femoral Nerve

Action - Flexion of the hip and extension of the knee

Question 2

Vastus Medialis

Vastus Intermedius

Vastus Lateralis

(anterior)

Answer 2

Origins
Medialis - medial lip of the Linea Aspera and the intertrochanteric line
Intermedius - Anterior surface of the femur
Lateralis - Lateral lip of the linea aspera and the greater trochanter of the femur

Insertion - Tibial tuberosity and patella ligament

Innervation - Femoral nerve

Action - Extention of the knee

Question 3

Sartorius (anterior)

Answer 3

Origin - ASIS

Insertion - Superior medial surface of the tibia

Innervation - Femoral nerve

Action - Knee flexion and internal rotation of the knee joint and flexion, abduction and external rotation of the hip

Question 4

Pectineus (anterior)

Answer 4

Origin - Pectineal line

Insertion - Pectineal line of the of femur

Innervation - femoral nerve

Action - adduction and flexion of the hip

Question 5

Psoas Major and Iliacus (iliopsoas) (anterior)

Answer 5

Origins
Psoas - transverse processes of T12 - L5
Iliacus - Iliac fossa

Insertion - Lesser trochanter of the femur

Innervations
Psoas - primary rami of L1-L3
Iliacus - Femoral nerve

Action - Flexion and external rotation of the hip

Question 6

Obturator Internus (medial thigh)

Answer 6

Origin - Obturator foramen

Insertion - greater trochanter

Innervation - obturator nerve

Action - external rotation

Question 7

Adductor Magnus (medial thigh)

Answer 7

Origins
Adductor part - rami of pubis and rami of ischium
Hamstring part - ishchial tuberosity

Insertions
Adductor part - Linea aspera of the femur
Hamstring part - adductor tubercle

Innervations
Adductor part - Obturator nerve
Hamstring part - tibial nerve

Actions
Adductor part - adduction and flexion of hip
Hamstring part - adduction and extention of hip

Question 8

Adductor longus (medial thigh)

Answer 8

Origin - Superior rami of pubis

Insertion - Linea aspera of femur

Innervation - obturator nerve

Action - adduction and internal rotation of hip

Question 9

Adductor brevis (medial thigh)

Answer 9

Origin - Body of pubis and inferior pubic rami

Insertion - linea aspera

Innervation - obturator nerve

Action - adduction of hip

Question 10

Gracilis (medial thigh)

Answer 10

Origin - inferior rami of the pubis

Insertion - medial surface of tibia

Innervation - obturator nerve

Action - adduction and flexion of hip and flexion and internal rotation of knee

Question 11

Biceps Femoris long and short head (posterior)

Answer 11

Origins
Long head - ishcial tuberosity
Short head - linea aspera

Insertion - Head of the fibula

Innervations
Long head - tibial nerve
Short head - common fibular nerve

Action - flexion at knee extension of hip and external rotation of hip and knee

Question 12

Semitendinosus

Answer 12

Origin - ishchial tuberosity

Insertion - medial surface of tibia

Innervation - Tibial nerve

Action - flexion and internal rotation of knee and extension and internal rotation of hip

Question 13

Semimembranosus

Answer 13

Origin - Ischial tuberosity

Insertion - medial tibial condyle

Innervation - tibial nerve

Action - flexion and internal rotation of knee and extension and internal rotation of hip