Architecture of Human Lower Extremity Muscles

Map of Flexor Hallucis Longus

Lateral View	Muscles of Interest: Psoas Major Iliacus Gluteus Maximus Gluteus Medius Sartorius Rectus Femoris Vastus Lateralis Vastus Intermedius Vastus Medialis Gracilis Adductor Longus Adductor Brevis Adductor Magnus Biceps Femoris Semitendinosus Semimembranosus Tibialis Anterior Extensor Hallucis Longus Extensor Digitorum Longus Peroneus Longus Peroneus Brevis Gastrocnemius Soleus Flexor Hallucis Longus Flexor Digitorum Longus Tibialis Posterior
Mass (g), without external tendon Muscle length (mm): LM; blue line shown above Tendon length (mm): LTED; from most distal fibers to the end of the tendon (blue line above) Fasicle lengths (mm): excise fasicles at green lines and measure their length 1, 2, 3 Pennation angle (deg): θ1 θ2 θ3 measure a pennation angle at every fascicle location