Wing dam in a man-made river bed. A wing dam or wing dike is a manmade barrier that, unlike a conventional dam, only extends partway into a river. These structures force water into a fast-moving center channel which reduces the rate of sediment accumulation while slowing water flow near the riverbanks.
Each foot is made up of 28 bones, 30 joints and more than 100 muscles, tendons and ligaments, all of which work together to provide support, balance and mobility. Here's a look at the main structures of the feet. Bones. Nearly one-fourth of the body's bones are in our feet.The bones of the feet are:1  Talus â the bone on top of the foot that forms a joint with the two bones of the lower leg, the tibia and fibula. 2  Calcaneus â the largest bone of the foot, which lies beneath the talus to form the heel bone.ones. Nearly one-fourth of the body's bones are in our feet. The bones of the feet are: 1  Talus â the bone on top of the foot that forms a joint with the two bones of the lower leg, the tibia and fibula. 2  Calcaneus â the largest bone of the foot, which lies beneath the talus to form the heel bone.
Movements and Muscles Involved. The ankle joint is a hinge type joint, with movement only possible in one plane. Thus, plantarflexion and dorsiflexion are the only movements that occur at the ankle joint. Eversion and inversion are produced at the other joints of the foot, such as the subtalar joint.rticulating Surfaces. The ankle joint is formed by three bones; the tibia and fibula of the leg, and the talus of the foot: 1  The tibia and fibula are bound together by strong tibiofibular ligaments, producing a bracket shaped socket, which is covered in hyaline cartilage. 2  This socket is known as a mortise.