11. Muscular branches of the popliteal artery supply the hamstring, gastrocnemius , soleus, and plantaris muscles. 12. This is because the gastrocnemius originates on the femur, so bending the leg limits its effective tension. 13. In 1941 Katz'implementation of microelectrodes in the gastrocnemius sciatic nerve of frogs legs illuminated the field. 14. In this population, a biopsy of the gastrocnemius muscle is a useful tool in correctly diagnosing the person. 15. This greatly shortens the gastrocnemius and soleus muscles at the back of the calf and can cause them to knot. 16. The " superficial layer " of posterior leg muscles is formed by the triceps surae and the gastrocnemius . 17. It arises from the semimembranosus tendon and connects anterior and distal to the gastrocnemius tubercle via the posterior joint capsule. 18. Behind it, and proximal to the medial condyle is a rough impression which gives origin to the medial head of the Gastrocnemius . 19. The gastrocnemius and soleus modulate the tibialis anterior to dorsiflex the foot, and finally the intrinsic and extrinsic foot muscles are active. 20. When walking in negative heeled shoes, muscle activity of gastrocnemius and tibialis anterior muscles are similar to that observed in uphill walking.