Posterior, Anterior And Medial Compartments Of Thigh

Front 1

Iiacus

Back 1

([L1], L2-3-4)
attachments- from superior 2/3 of the iliac fossa, internal lip of the iliac crest, sacral ala & SI ligaments to femur just distal to lesser trochanter
actions- flexes hip and stabilizes hip joint
innervation- femoral nerve

Front 2

Psoas major

Back 2

(L1-2-3-4)
attachments- from anterior transverse processes, vertebral bodies & discs (T12-L5) to the lesser trochanter
actions- flexes hip and stabilizes hip joint
innervation- ventral rami L1-4 (from lumbar plexus)

Front 3

Rectus femoris

Back 3

(L2, 3, 4) (L. straight)
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

Front 4

Sartorius

Back 4

(L2-3 [4])
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

Front 5

Tensor fasciae latae

Back 5

(L4-5-S1)
attachments- from anterior superior iliac spine & external lip iliac crest to iliotibial tract at the junction of the proximal and middle thirds of the thigh
actions- abducts, flexes & medially rotates hip, and assists in maintaining knee extension
innervation- superior gluteal nerve

Front 6

Vastus intermedius

Back 6

(L2, 3, 4)
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

Front 7

Vasus lateralis

Back 7

(L2, 3, 4)
attachments- from the proximal part of the intertrochanteric line, greater trochanter, gluteal tuberosity & linea aspera to the base & lateral border of the patella
actions- extends knee
innervation- femoral nerve

Front 8

Vastus medialis

Back 8

(L2, 3, 4)
attachments- from the distal half of the intertrochanteric line, spiral line, linea aspera & medial supracondylar line to the base & medial border of the patella
actions- extends leg
innervation- femoral nerve

Front 9

Articularis genu

Back 9

(L2, 3, 4) (small muscle that may be blended with vastus intermedius)
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)

Front 10

Adductor brevis

Back 10

(L2-3-4)
attachments- from inferior pubic ramus to distal 2/3 pectineal line and proximal half of the medial lip linea aspera
actions- adducts and flexes hip
innervation- obturator nerve

Front 11

Adductor longus

Back 11

(L2-3-4)
attachments- from pubic crest to medial lip linea aspera
actions- adducts and flexes hip
innervation- obturator nerve

Front 12

Adductor magnus

Back 12

(L2-3-4 & L4-5-S1)
attachments- from the inferior pubic ramus, ischial ramus & ischial tuberosity to gluteal tuberosity, linea aspera, medial supracondylar line & adductor tubercle of the medial condyle of the femur
actions- adducts, flexes (adductor part) & extends (hamstring part) hip
innervation- obturator nerve (adductor region) & tibial division of the sciatic nerve

Front 13

Gracilis

Back 13

(L2-3-4)
attachments- from the body of the pubis & inferior pubic ramus to the medial surface of tibia, distal to condyle, proximal to insertion of semitendinosus, lateral to insertion of sartorius
actions- flexes & medially rotates the knee, and adducts hip
innervation- obturator nerve

Front 14

Pectineus

Back 14

(L2-3-4)
attachments- from superior pubic ramus between the iliopectineal eminence and the pubic tubercle to the femur between the lesser trochanter & linea aspera(pectineal line)
actions- adducts, flexes hip
innervation- femoral nerve & obturator nerve

Front 15

Obturator externus

Back 15

(L3-4)
attachments- from rami of pubis and ischium; external surface obturator membrane to trochanteric fossa
actions- laterally rotates hip
innervation- obturator nerve

Front 16

Biceps Femoris

Back 16

(L5-S1-2-3 to long head; L5-S1-2 to short head)
attachments- from the ischial tuberosity & sacrotuberous lig. (long head) ; lateral lip of linea aspera & proximal 2/3rd of the supracondylar line (short head) to the lateral side of fibular head
actions- flexes knee (both heads) & extends hip (long head only)
innervation- tibial branch of sciatic (long head) & peroneal branch of sciatic nerve(short head)

Front 17

Semimembranosus

Back 17

(L4-5-S1-2)
attachments- from ischial tuberosity to posterior aspect of the medial tibial condyle
actions- extends hip, and flexes & medially rotates knee
innervation- tibial division of the sciatic nerve

Front 18

Semitendinosus

Back 18

(L4-5-S1-2)
attachments- from the ischial tuberosity to the proximal, medial tibia
actions- extends hip, and flexes & medially rotates knee
innervation- tibial division of the sciatic nerve