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.
The knee is a joint that allows you to bend and extend your leg. It makes it easier for you to sit, walk and run. The bones that make up the knee are the femur, or the thighbone, the tibia, which is the shinbone, and the patella, which is your kneecap.Ligaments, which are bands of tough fibers, hold these bones together and allow for motion. Inside the knee, two ligaments hold the thighbone to the shinbone.Two types of cartilage are present in the knee joint. The first type of cartilage is articular cartilage. This cartilage covers the ends of the bones and provides a smooth gliding surface.o lubricate the knee, a lining of tissue inside the joint, called the synovium, produces a lubricating fluid. The knee joint is surrounded by a joint capsule, which attaches to each side of the joint and helps keep the lubricating fluid inside.