The tibial nerve is a branch of the sciatic nerve. The tibial nerve passes through the popliteal fossa to pass below the arch of soleus. Structure
Popliteal fossa
The tibial nerve is the larger terminal branch of the sciatic nerve with root values of L4, L5, S1, S2, and S3. It lies superficial (or posterior) to the popliteal vessels, extending from the superior angle to the inferior angle of the popliteal fossa, crossing the popliteal vessels from lateral to medial side. It gives off branches as shown below:
Muscular branches - Muscular branches arise from the distal part of the popliteal fossa. It supplies the medial and lateral heads of gastrocnemius, soleus, plantaris and popliteus muscles. Nerve to popliteus crosses the popliteus muscle, runs downwards and laterally, winds around the lower border of the popliteus to supply the deep (or anterior) surface of the popliteus. This nerve also supplies the tibialis posterior muscle, superior tibiofibular joint, tibia bone, interosseous membrane of leg, and the inferior tibiofibular joint. Cutaneous branches - Tibial nerve also gives off a cutaneous nerve called the medial sural nerve from the middle of the popliteal fossa and exits at the inferior angle. It supplies the skin of the lower half of the back of the leg and lateral border of the foot until the tip of the little toe.
Formulation
Dakins original solution contained sodium hypochlorite (0.4% to 0.5%), prepared by treating calcium hypochlorite with sodium carbonate ("washing soda"). The solution left after removal of the insoluble calcium carbonate still contained some soda. Boric acid (4%) was then added as a buffering agent to maintain a pH of between 9 and 10. Dakin found that alkalinity outside this range was too irritating. The solution, while unstable, remains effective for at least a week, if made to the correct pH.Other formulations have been developed over time. In 1916, Marcel Daufresne substituted sodium bicarbonate for Dakins boric acid as buffering agent. This formulation is the basis of current commercial products.The concentration chosen by Dakin (0.5%) was the maximum highest concentration found tolerable to the skin. It is the concentration recommended by the U.S. Center for Disease Control (CDC) as a household disinfectant. In one study, bactericidal effects of sodium hypochlorite solution were observed at concentrations as low as 0.025%, without any tissue toxicity in vivo or in vitro. It recommended that concentration be adopted as a "modified Dakins solution" for wound dressing. See also
Chlorine-releasing compound
Hydrogen peroxide
Povidone-iodine
Phenol ("carbolic acid")
Eusol


== References ==