Thigh Muscles

Question 1

Pectineus

Answer 1

Origin: superior pubic ramus
Insertion: pectineal line
Action: Adduction thigh, flexion thigh, internal rotation thigh
Innervation: Femoral nerve L2, L3

Question 2

Adductor longus

Answer 2

Origin: Superior pubic ramus
Insertion: medial third of linea aspera
Action: adduction thigh
Innervation: Obturator nerve L2, L3, L4

Question 3

Adductor brevis

Answer 3

Origin: inferior pubic ramus
Insertion: pectineal line and proximal aspect of linea aspera
Action: adduction thigh
Innervation: obturator nerve L2, L3, L4

Question 4

Adductor magnus (adductor and hamstring part)

Answer 4

Adductor
Origin: inferior pubic ramus, ischial ramus
Insertion: gluteal tuberosity; linea aspera
Action: adduction thigh, flexion thigh
Innervation: Obturator nerve L2, L3, L4
Hamstring
Origin: Ischial ramus, ischial tuberosity
Insertion: adductor tubercle of femur
Action: adduction thigh, extension thigh
Innervation: Tibial nerve L4

Question 5

Gracilis

Answer 5

Origin: Inferior pubic ramus
Insertion: medial to the tibial tuberosity via pes anserinus
Action: adduction thigh, flexion thigh, flexion leg, internal rotation leg
Innervation: Obturator nerve L2, L3

Question 6

Psoas major

Answer 6

Origin: lateral surface of T12-L5 vertebral bodies, discs, and transverse processes
Insertion: lesser trochanter
Action: flexion thigh, external rotation thigh, flexion lumbar spine, ipsilateral lateral flexion spine
Innervation: L1-L3 direct branches from lumbar plexus

Question 7

Psoas minor

Answer 7

Origin: Vertebral bodies of T12-L1 vertebrae and adjacent intervertebral disc
Insertion: Iliopectineal eminence and pecten pubis of hip bone
Action: assists flexion of trunk
Innervation: Direct branches of L1

Question 8

Iliacus

Answer 8

Origin: iliac fossa
Insertion: tendon of Psoas major; lesser trochanter
Action: flexion thigh, external rotation thigh
Innervation: Femoral nerve L2, L3

Question 9

Sartorius

Answer 9

Origin: ASIS
Insertion: Medial to the tibial tuberosity via pes anserinus
Action: flexion thigh, abduction thigh, external rotation thigh, flexion leg, internal rotation leg when knee flexed
Innervation: Femoral nerve L2, L3

Question 10

Rectus femoris

Answer 10

Origin: AIIS
Insertion: Quad tendon to base of patella; tibial tuberosity via patellar tendon
Action: flexion thigh, extension leg
Innervation: Femoral nerve L2, L3, L4

Question 11

Vastus medialis

Answer 11

Origin: medial lip of linea aspera
Insertion: Quad tendon to base of patella; tibial tuberosity via patellar tendon
Action: extension leg
Innervation: Femoral nerve L2, L3, L4

Question 12

Vastus lateralis

Answer 12

Origin: Lateral lip of linea aspera
Insertion: Quad tendon to base of patella; tibial tuberosity via patellar tendon
Action: extension leg
Innervation: Femoral nerve L2,L3, L4

Question 13

Vastus intermedius

Answer 13

Origin: Anterior femur
Insertion: Quad tendon to base of patella; tibial tuberosity via patellar tendon
Action: extension leg
Innervation: Femoral nerve L2, L3, L4

Question 14

Biceps femoris

Answer 14

Long head
Origin: Ischial tuberosity
Insertion: Head of fibula
Action: extension thigh, flexion leg, external rotation leg when knee flexed
Innervation: Tibial nerve L5, S1, S2 \
Short head
Origin: Lateral aspect of linea aspera
Insertion: head of fibula
Action: flexion leg, external rotation leg when knee flexed
Innervation: Common fibula nerve L5, S1, S2

Question 15

Semimembranosus

Answer 15

Origin: Ischial tuberosity
Insertion: Medial tibial condyle
Action: extension thigh, flexion leg, internal rotation leg when knee flexed
Innervation: Tibial nerve L5, S1, S2

Question 16

Semitendinosus

Answer 16

Origin: Ischial tuberosity
Insertion: medial to the tibial tuberosity via pes anserinus
Action: extension thigh, flexion leg, internal rotation leg when knee flexed
Innervation: Tibial nerve L5, S1, S2