Anterior Femoral Muscles

Question 1

Iliopsoas (L1-4)

Answer 1

1. Iliacus (L2-3-4)
   attachments- from iliac fossa, iliac crest, sacral ala & sacroiliac ligaments to lesser trochanter of femur

actions- flexes and stabilizes the hip joint

innervation- femoral nerve

2. Psoas major (L. muscle of the loin) (L1-2-3-4)

attachments- from anterior transverse processes, vertebral bodies & discs (T12-L5) to the lesser trochanter of femur

actions- flexes and stabilizes the hip joint

innervation- ventral rami L1-4 (from lumbar plexus)

Question 2

Rectus femoris

Answer 2

attachments- from anterior inferior iliac spine and groove superior to the acetabulum to the base of the patella

actions- flexes hip, and extends knee

innervation- femoral nerve

(L2, 3, 4)

Question 3

Sartorius

Answer 3

attachments- from anterior superior iliac spine to the medial aspect of the proximal tibia

actions- flexes, abducts & laterally rotates hip, and flexes & assists medial rotation of the knee

innervation- femoral nerve

(L2-3)

Question 4

Tensor fasciae latae

Answer 4

attachments- from anterior superior iliac spine & external lip iliac crest to iliotibial tract

actions- abducts, flexes & medially rotates hip, and assists in maintaining knee extension

innervation- superior gluteal nerve

(L4-5-S1)

Question 5

Vastus intermedius

Answer 5

attachments- from the anterior aspect of the proximal 2/3rds of the femoral shaft to the lateral border of the patella

actions- extends knee

innervation- femoral nerve

(L2, 3, 4)

Question 6

Vastus medialis

Answer 6

attachments- from the intertrochanteric line, spiral line, linea aspera & medial supracondylar line to the base & medial border of the patella

actions- extends leg

innervation- femoral nerve

(L2, 3, 4)

Question 7

Articularis genu

Answer 7

attachments- from the distal anterior shaft of femur to proximal portion of synovial membrane of knee joint

actions- pulls articular capsule proximally

innervation- femoral nerve (a branch of the nerve from the vastus intermedius)

(L2, 3, 4)

Question 8

Vastus Lateralis

Answer 8

attachments- from the intertrochanteric line, greater trochanter, gluteal tuberosity & linea aspera to the base & lateral border of the patella

actions- extends knee

innervation- femoral nerve

(L2, 3, 4)