Lower Extremity muscles

includes origin, insertion, and action

Iliopsoas group:

Psoas major

Origin: lumbar vertebrae (n/a)

Insertion: Femur (n/a)

Action:Flexion of the hip

Ilipsoas group:

Iliacus

Origin: Ilium (n/a)

Insertion: greater trochanter (n/a)

Action: flexion of hip

Gluteus maximus

Origin: sacrum (n/a)

Insertion: Greater trochanter (n/a)

Action:extension & lateral/external rotation of hip

Gluteus medius & Gluteus minimus

Origin: lateral ilium (n/a)

Insertion: Greater trochanter (n/a)

Action: abduction of hip

Tensor fascia latae (TFL)

Origin: Iliac crest

Insertion: IT band

Action: stabilizes knee

Piriformis

Origin: sacrum

Insertion: femur

Action: abduction & lateral rotation of hip

Quadratus femoris

Origin: n/a

Insertion:n/a

Action: lateral/external rotation of hip

Pectineus

Origin: pubis

Insertion: femur

Action: flexion & adduction of hip

Adductor magnus

Origin: pubis

Insertion: Linea aspera

Action: adduction of hip

Adductor longus & Adductor brevis

Origin: pubis

Insertion: femur

Action: adduction of hip

Gracilis

Origin: pubis

Insertion: tibia

Action: adduction of hip, flexion of knee

Sartorius

Origin: ASIS

Insertion: tibia

Action: lateral rotation of hip, flexion of hip, flexion of knee

Quadriceps femoris (Quads):

Rectus femoris

Origin: AIIS

Insertion: tibial tuberosity via patellar tendon

Action: flexion of hip

Quadriceps femoris (Quads):

Vastus lateralis

Origin: lateral femur

Insertion: tibial tuberosity via patellar tendon

Action: extension of knee

Quadriceps femoris (Quads):

Vastus medialis

Origin: medial femur

Insertion: tibial tuberosity via patellar tendon

Action: extension of knee

Quadriceps femoris (Quads):

Vastus intermedius

Origin: femur

Insertion: tibial tuberosity via patellar tendon

Action: extension of knee

Hamstrings:

Biceps femoris long head

Origin: ischial tuberosity

Insertion: fibula

Action: extension of hip, flexion of knee

Hamstrings:

Biceps femoris Short head

Origin: femur

Insertion: fibula

Action: extension of hip, flexion of knee

Hamstrings:

Semimembranosus

Origin: ischial tuberosity

Insertion: tibia

Action: extension of hip, flexion of knee

Hamstrings:

Semitendinosus

Origin: ischial tuberosity

Insertion: tibia

Action: extension of hip, flexion of knee

Tibialis anterior

Origin: n/a

Insertion: n/a

Action: dorsiflexion (ankle)

Tibialis posterior

Origin: n/a

Insertion: n/a

Action: plantar flexion (ankle)

Peroneus (fibularis) longus

Origin: n/a

Insertion: n/a

Action: eversion & plantar flexion (ankle)

peroneus (fibularis) brevis

Origin: n/a

Insertion: n/a

Action: eversion & plantar flexion (ankle)

Gastrocnemius

Origin:n/a

Insertion: calcaneus via Achilles tendon

Action: flexion of knee & plantar flexion

Soleus

Origin: n/a

Insertion: calcaneus via Achilles tendon

Action: plantar flexion

Extensor digitorium longus

Origin: n/a

Insertion: n/a

Action: extend toes