Lower Extremity III study guide What are the muscles of the dorsum of the foot? What are the muscles of the plantum of the foot? Describe the fascial layer, the 4 muscular layers, and the 2 neurovascular layers. Is the ankle less stable when in plantarflexion or dorsiflexion? Why? What is the broad term for the medial collateral ankle ligamentous tissue? What is a Potts fracture? What are the three lateral collateral ligaments? What are the 3 arches of the foot? What muscle tendon actions make the transverse arch? What is pes planus? What is the difference between flexible and rigid pes planus? When is pes planus normal to have? What is jogger's foot? What is the blood supply of the dorsum of the foot? Plantum? What is the lymphatic drainage?