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.
Strong foot and ankle muscles are essential for good balance and mobility. Foot muscle weakness develops after injury or prolonged periods of decreased activity. Extrinsic foot muscles are used for walking and are responsible for dynamically stabilizing the ankle joint during movement.These muscles originate outside the foot-in the lower leg-and attach to bones in the foot through tendons.Perform exercises to strengthen the extrinsic muscles of the foot.erform seated toe raises to strengthen your dorsiflexors, which are the muscles responsible for lifting your toes up off the floor. Sit in a chair with your feet flat on the floor. Keep your heels on the floor and lift your toes toward the ceiling. Hold for three seconds then lower back down.