Anterior thigh and hip adductor muscles

Question 1

Sartorius
* origin
* insertion
* action
* innervation

Answer 1

• origin: anterior superior iliac spine
• insertion: medial aspect of the tibia via pes anserinus
• action: flexion of thigh; flexion of leg; external rotation of thigh; internal rotation of leg (when leg is flexed)
• innervation: femoral nerve

Question 2

Rectus femoris
* origin
* insertion
* action
* innervation

Answer 2

• origin: anterior inferior iliac spine
• insertion: patella, tibial tuberosity
• action: extension of leg, flexion of the thigh
• innervation: femoral nerve

Question 3

Vastus lateralis
* origin
* insertion
* action
* innervation

Answer 3

• origin: linea aspera of the femur, greater trochanter of the femur
• insertion: patella, tibial tuberosity
• action: extension of leg
• innervation: femoral nerve

Question 4

Vastus medialis
* origin
* insertion
* action
* innervation

Answer 4

• origin: linea aspera of the femur, intertrochanteric line
• insertion: patella, tibial tuberosity
• action: extension of the leg
• innervation: femoral nerve

Question 5

Vastus intermedius
* origin
* insertion
* action
* innervation

Answer 5

• origin: body of femur
• insertion: patella, tibial tuberosity
• action: extension of leg
• innervation: femoral nerve

Question 6

Pectineus
* origin
* insertion
* action
* innervation

Answer 6

• origin: pectineal line of the pubic bone
• insertion: pectineal line of the femur
• action: adduction of the thigh; external rotation of thigh
• innervation: femoral nerve

Question 7

Adductor brevis
* origin
* insertion
* action
* innervation

Answer 7

• origin: body of the pubic bone; inferior pubic ramus
• insertion: linea aspera of the femur
• action: adduction of the thigh; internal and external rotation of the thigh (depending on position of femur: flexed = internal rotation; extended = external rotation)
• innervation: obturator nerve

Question 8

Adductor longus
* origin
* insertion
* action
* innervation

Answer 8

• origin: body of the pubic bone
• insertion: linea aspera of the femur
• action: adduction of the thigh; external rotation of thigh
• innervation: obturator nerve

Question 9

Adductor magnus
* origin
* insertion
* action
* innervation

Answer 9

adductor portion (anterior):
* origin: ischio-pubic ramus
* insertion: linea aspera of femur
* action: adduction, dynamic stabilization, thigh flexion, medial rotation
* innervation: obturator nerve

hamstring portion (posterior):
* origin: ischial tuberosity
* insertion: adductor tubercle of femur
* action: adduction, dynamic stabilization, thigh extension and lateral rotation
* innervation: sciatic nerve

Question 10

Gracilis
* origin
* insertion
* action
* innervation

Answer 10

• origin: body of the pubic bone; inferior pubic ramus
• insertion: pes anserinus
• action: adduction of thigh; flexion of the leg; internal rotation of leg
• innervation: Obturator nerve