Muscles of the Anterior Thigh (Flexors)

Question 1

Pectineous

Answer 1

O: Superior Ramus of Pubis
I: Pectineal Line of Femur
N: Femoral Nerve (L2, L3), may receive a branch from obturator nerve
A: Adducts and Flexes Thigh; Assists with Medial Rotation of Thigh

Question 2

Psoas Major

Answer 2

O: Sides of T12-L5 vertebrae and discs between them; TPs of all Lumbar Vertebra
I: Lesser Trochanter of Femur
N: APR of Lumbar Nerves (L1, L2, L3)
A: Act conjointly in flexing thigh at hip joint and in stabilizing this joint

Question 3

Psoas Minor

Answer 3

O: Sides of T12-L1 vertebrae and IV Discs
I: Pectineal Line, Iliopectineal Eminence via Iliopubic Arch
N: APR of Lumbar Nerves (L1)
A: Acts on Lumbar Spine (weak trunk flexor)

Question 4

Iliacus

Answer 4

O: Iliac Crest, Iliac Fossa, Ala of Sacrum, and Anterior Sacroiliac Ligaments
I: Tendon of Psoas Major, Lesser Trochanter, and Femur distal to it
N: Femoral Nerve (L2, L3)
A: Act conjointly in flexing thigh at hip joint and in stabilizing this joint

Question 5

Sartorius

Answer 5

O: ASIS and Superior Part of Notch Inferior to it
I: Superior part of medial surface of Tibia
N: Femoral Nerve (L2-L3)
A: Flexes, Abducts, and Laterally Rotates Thigh at Hip Joint; Flexes leg at Knee Joint, (medially rotating leg when knee is flexed)

Question 6

Rectus Femoris

Answer 6

O: AIIS and Ilium Superior to Acetabulum
I: Via common Tendinous and independent attachments to base of Patella; Indirectly via Patellar Ligament to Tibial Tub
N: Femoral Nerve (L2-L4)
A: Extend Leg at Knee joint; also steadies hip joint and helps Iliopsoas flex thigh.

Question 7

Vastus Lateralis

Answer 7

O: Greater Trochanter and Lateral Lip of Linea Aspera of Femur
I: Via common Tendinous and independent attachments to base of Patella; Indirectly via Patellar Ligament to Tibial Tub;Tibia and Patella Aponeuroses
N: Femoral Nerve (L2-L4)
A: Extend Leg at Knee joint

Question 8

Vastus Medialis

Answer 8

O: Intertrochanteric Line and Medial Lip of Linea Aspera of Femur
I: Via common Tendinous and independent attachments to base of Patella; Indirectly via Patellar Ligament to Tibial Tub;Tibia and Patella Aponeuroses
N: Femoral Nerve (L2-L4)
A: Extend Leg at Knee joint

Question 9

Vastus Intermedius

Answer 9

O: Anterior and Lateral Surfaces of Shaft of Femur
I: Via common Tendinous and independent attachments to base of Patella; Indirectly via Patellar Ligament to Tibial Tub;Tibia and Patella Aponeuroses
N: Femoral Nerve (L2-L4)
A: Extend Leg at Knee joint