O & I: Hip Flexor Muscles (Ant. Thigh)

Question 1

Origin: Pectineus

Answer 1

Superior pubic ramus

Question 2

Insertion: Pectineus

Answer 2

Pectineal line of femur, just inferior to lesser trochanter

Question 3

Innervation: Pectineus

Answer 3

Femoral nerve (L2, L3); may receive a branch from obturator nerve

Question 4

Action: Pectineus

Answer 4

adducts and flexes thigh; assists with medial rotation of thigh

Question 5

Origin: Sartorius

Answer 5

anterior superior iliac spine and superior part of notch inferior to it

Question 6

Insertion: Sartorius

Answer 6

Pes Anserine Superior part of medial surface of tibia

Question 7

Innervation: Sartorius

Answer 7

femoral nerve (L2, L3)

Question 8

Action: Sartorius

Answer 8

flexes, abducts, and laterally rotates thigh at hip joint; flexes leg at knee joint, (medially rotating leg when knee is flexed)

Question 9

Origin: Iliopsoas

Answer 9

Lumbar vertebrae T12-L5, iliac crest, iliac fossa, and sacrum

Question 10

Insertion: Iliopsoas

Answer 10

lesser trochanter via fused tendon

Question 11

Innervation: Iliopsoas

Answer 11

anterior rami of L1-L3

Question 12

Action: Iliopsoas

Answer 12

Flexion of the hip joint (as in lifting the lower limb when walking), flexion of the trunk. Also important in posture — acting inferiorly, flexes the trunk (as in raising the trunk from the supine position to the sitting position)