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.
Also known as the peroneus brevis, the fibularis brevis is a short, peroneal muscle that lies just underneath the peroneus longus muscle. The peroneal muscles extend along the outer portion of the lower leg and foot. The peroneus brevis attaches to the lower two-thirds of the fibula bone and the fifth metatarsal bone of the foot. The superficial peroneal nerves (L5 and S1) are the power source behind this muscle. The peroneus brevis plays an important role in the motor functions of the foot. The muscle assists in the flexion that moves the ball of the foot away from the body. The muscle also assists with the eversion (turning outward) of the inner portion of the foot.