-
biceps femoris:
action:
origin:
insertion:
innervation:
root:
- action
- knee flexion
- external tibial rotation
- long head: hip extension, hip external rotation
- origin
- long head: iscial tuberosity, sacrotuberous ligament
- short head: lateral lip of the linea aspera, upper 2/3rds of the supracondylar line
- insertion
- lateral fibular head
- lateral tibial condyle
- innervation
- long head: tibial
- short head: common peroneal
- root
- long head: S1, S2, S3
- short head: L5, S1, S2
-
gastrocnemius
action:
origin:
insertion:
innervation:
root:
- action
- assists in knee flexion
- ankle plantarflexion
- origin
- medial head: posterior surface of the medial femoral condyle; adjacent portion of the femur and knee capsule
- lateral head: posterior surface of the lateral femoral condyle; adjacent portion of the femur and knee capsule
- insertion
- to the calcaneus via the achilles tendon
-
gracillis
action:
origin:
insertion:
innervation:
root:
- action
- knee flexion
- internal tibial rotation
- hip adduction
- origin
- symphysis pubis
- inferior ramus of the pubic bone
- insertion
- proximal portion of the anteor-medial tibial flare
- innervation
- obturator (posterior)
-
popliteus
action:
origin:
insertion:
innervation:
root:
- action
- open chain: internal tibial rotation, knee flexion
- closed chain: external femoral rotation, knee flexion
- origin
- lateral femoral condyle
- oblique popliteal ligament
- insertion
- posterior tibia superior to the soleal line
- fascia covering the soleus
-
rectus femoris
action:
origin:
insertion:
innervation:
root:
- action
- knee extension
- hip flexion
- origin
- anterior inferior iliac spine
- groove located superior to the acetabulum
- insertion
- to the tibial tubercle via the patella and patellar ligament
-
sartorius
action:
origin:
insertion:
innervation:
root:
- action
- knee flexion
- internal tibial rotation
- hip flexion
- hip abduction
- hip external rotation
- origin
- anterior superior iliac spine
- insertion
- proximal protion of the antero-medial tibial flare
-
semimembranosus
action:
origin:
insertion:
innervation:
root:
- action
- knee flexion
- internal tibial rotation
- hip extension
- hip internal rotation
- insertion
- posteromedial portion of the tibia's medial condyle
-
semitendinosus
action:
origin:
insertion:
innervation:
root:
- action
- knee flexion
- internal tibial rotation
- hip extension
- hip internal rotation
- insertion
- medial portion of the tibial flare
-
vastus intermedius
action:
origin:
insertion:
innervation:
root:
- origin
- anterolateral portion of the upper 2/3rds of the femur
- lower one half of the linea aspera
- insertion
- to the tibial tubercle via the patella and patellar ligament
-
vastus lateralis
action:
origin:
insertion:
innervation:
root:
- origin
- proximal interochanteric line
- greater trochanter
- gluteal tuberosity
- upper 1/2 of the linea aspera
- insertion
- to the tibial tubercle via the patella and the patellar ligament
-
vastus medialis
action:
origin:
insertion:
innervation:
root:
- action
- knee extension
- oblique portion: patellar stabilization
- origin
- longus portion: distal 1/2 of the intertrochanteric line; medial protion of the liean aspera
- oblique portion: tendons from adductor longus and adductor magnus
- insertion
- to the tibial tubercle via the patella and the patellar ligament
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