Ch. 19: muscles of the anterior and medial femoral compartments Flashcards
Psoas Major
O : anterior surface of bodies/transverse processes of last thoracic and all lumbar vertebrae
I: Lesser trochanter of femur (backside)
A: flexes and laterally rotates thigh
N: Ventral rami of spinal nerves L1,2,3
Iliacus
O: Iliac fossa
I: Lesser trochanter of femur (w/ psoas major)
A: flexion and lateral rotation of thigh
N: femoral N. (L2,3)
Sartorius
O: A.S.I.S
I: medial tibia below bondyle with gracilis and semitendinosus muscles at “pes anserinus”
A: Flexes leg and rotates medially; flexes thigh and rotates laterally; abducts limb when knee is locked
N: Femoral N.
“tailor’s muscle”
Rectus Femoris
strong, bipennate muscle that crosses two joints
O: AIIS (straight head), superior brim of acetabulum (reflected head)
I: Superior surface of patella; to tibial tuberosity via patellar ligament
A: flexion of thigh, extension of leg
N: femoral n.
Vastus Lateralis
O: anterolateral surface of femur
I: Lateral border of patella; to tibial tuberosity via patellar ligament
A: extension of leg
N: femoral n.
Vastus Medialis
O: anteromedial surface of femur
I: lateral border of patella via patellar ligament
A: extension of leg; assists in maintaining proper patellar tracking
N: femoral n.
Vastus Intermedius
O: most anterior surface of femur
I: deep surface of tendon of rectus femoris and other vastus muscles via aponeurosis
A: extension of the leg
N: femoral n.
Articulus Genu
- deepest portion of vastus intermedius
O: lower anterior surface of femur
I: upper portion of synovial membrane of knee joint
A: prevents synovial membrane from becoming trapped between patell and femur
N: femur n.
Pectineus
O: superior pubic ramus (pectineal line of pubis)
I: posterior femur below lesser trochanter (pectineal line of femur)
A: adduction, flexion, assists in rotation
N: femoral n, obturator n. or both; accessory obturator n when present
Adductor Longus
O: front of pubis bone
I: Middle portion of medial lip of linea aspera
A: adduction, flexion, assists in rotation of thigh
N: anterior division of obturator n.
Adductor Brevis
O: inferior pubic ramus
I: upper one half of medial lip of linea aspera
A: Adduction, flexion, assists in rotation of thigh
N: anterior division of obturator n.
Adductor Magnus
(sits under reflected adductor longus)
O: Ishiopubic ramus
I: Medial portion of femur from below lesser trochanter to adductor tubercle
A: entire muscle adducts thigh
Proximal portion: adducts and flexes, assists in rotation of thigh
Distal portion: adducts and extends, assists in rotation of thigh
N: proximal = posterior division of obturator
distal portion = tibial n.
NOTE: a gap exists in the distal attachment of the adductor magnus muscle (adductor hiatus) which provides continuity between the adductor canal aboe and the politeal fossa below
Gracilis
“long and thin muscle”
O: inferior pubic ramus near symphysis
I: pes anserinus
A: adducts thigh, flexes and medially rotates leg
N: anterior division of obturator n.
Obturator externus
(completely horizontal fibers –> lateral rotation)
O: outer surface of obturator membrane and outer margins of the obturator foramen
I: trochanteric fossa
A: lateral rotation of thigh
N: posterior division of obturator n.
