Section 4: Pelvic Girdle & Lower Limbs

Rectus Femoris

Extends knee, flexes thigh

Action of Rectus Femoris

Anterior Inferior Iliac Spine (AIIS)

Origin of Rectus Femoris

Tibial tuberosity via patellar ligament

Insertion of Rectus Femoris

Vastus Lateralis

Vastus Medialis

Vastus Intermedius

Extends knee

Action of Vastus Lateralis, Medialis, Intermedius

Tibial tuberosity

Insertion of Vastus Lateralis, Medialis, Intermedius

Greater trochanter, linea aspera

Origin of Vastus Lateralis

Linea Aspera

Origin of Vastus Medialis

Anterior femur

Origin of Vastus Intermedius

Gracilis

Adducts the thigh

Action of Gracilis

Body and inferior ramus of the pubis

Origin of Gracilis

Medial surface of the proximal tibia

Insertion of Gracilis

Sartorius

Flexes, abducts, laterally rotates thigh, flexes leg

Action of Sartorius

Anterior Superior Iliac Spine (ASIS)

Origin of Sartorius

Medial tibia

Insertion of Sartorius

Biceps Femoris

Semitendinosus

Semimembranosus

Extends thigh, flexes knee

Action of Biceps Femoris, Semitendinosus, Semimembranosus

Ischial tuberosity, linea aspera

Origin of Biceps Femoris

Head of fibula

Insertion of Biceps Femoris

Ischial tuberosity

Origin of Semitendinosus and Semimembranosus

Medial tibia

Insertion of Semitendinosus

Medial tibial condyle

Insertion of Semimembranosus

Tibialis Anterior

Dorsiflexes and inverts foot

Action of Tibialis Anterior

Lateral tibia

Origin of Tibialis Anterior

2st metatarsal and medial cuneiform

Insertion of Tibialis Anterior

Gastrocnemius

Plantar flexes foot, flexes knee

Action of Gastrocnemius

Medial and lateral condyles of femur

Origin of Gastrocnemius

Calcaneus via Achilles tendon

Insertion of Gastrocnemius and Soleus

Soleus

Plantar flexes foot

Action of Soleus

Tibia and Fibula

Origin of Soleus