Knee - Origins, insertions and movement Flashcards
Vastus Medialis
O - Linea Aspera (femur)
I - Patella (medial edge)
M - knee extension
Vastus intermedius
O - Anterior and lateral surfaces of femur
I - Patella (via quadratus femoris tendon)
M - Knee extension
Vastus Lateralis
O - Femur (Linea aspera and gluteal tuberosity)
I - Patella: upper border (and base via quadratus femoris tendon)
M - Knee extension
Rectus Femoris (straight head)
O - hip bone: AIIS
I - patella (via quadratus femoris tendon)
M -
Rectus Femoris (reflected head
O - hip bone (acetabulum)
I - patella (via quadratus femoris tendon)
M -
Bicep femoris
O - ischial tuberosity (upper and inner surface of posterior side), joined with semitendinosus
I - styloid process of fibula
M - knee flexion
assists hip joint extension
Semimembraneosis
O - ischial tuberosity (upper outer quadrant of posterior side)
I - medial condyle of tibia (posterior)
M - knee flexion
hip extension
medially rotates lower leg when knee is flexed
semitendonosis
O - ischial tuberosity (inner quadrant of posterior surface)
I - upper medial surface of tibia into pesanserine tendon
M - knee flexion
Hip extension
medially rotates lower leg when knee is flexed
Gracilis
O - lower half of body of pubis (inferior pubic ramus and adjoring part of ischial ramus)
I - medial flare of tibia below medial condyle
M - Leg flexion
Medial rotation when leg is semiflexed
aids thigh adductors
sartorius
O - inferior ASIS
I - Upper medial surface of tibial shaft at the tibial flare
M - synergist muscle used to assist in hip and knee flexion and weakly abduct and laterally rotate femur
gastrocnemius (medial)
O - medial posterior condyle depression and popliteal surface
I - three facets on the posterior surface of calcaneus
M - knee flexion
Plantar flexion
Gastrocnemius (lateral)
O - lateral surface of lateral condyle and lower part of corresponding supracondylar line
I - three facets on the posterior surface of calcaneous
M - knee flexion
Plantar flexion
Plantaris
O - lateral supracondylar ridge of femur
I - medial aspect of posterior surface of calcaneus
M - Knee flexion (weak)
Plantar flexion (weak)
Popliteus
O - lateral surface on lateral condyle of femur (middle of three facets)
I - medial two thirds of the triangular area above soleal line on the posterior surface of the tibia
M - rotates femur laterally on the fixed tibia. this unlocks the extended knee
