The subtalar joint contributes to 10% of dorsiflexion of the ankle. There are three articulating facets between the talus and the calcaneus, delineated as the anterior, middle and posterior facets. The sustentaculum tali forms the floor of middle facet, and the anterior facet articulates with the head of the talus, and sits lateral and congruent to the middle facet.
The most abundant element on Earth is oxygen, but the most abundant element in the entire universe is hydrogen. On Earth, oxygen makes up approximately 47 percent of the Earth's mass and is found both in Earth's atmosphere and crust. Continue Reading.
Hydrogen is easily the most abundant element in the universe. It is found in the sun and most of the stars, and the planet Jupiter is composed mostly of hydrogen. On Earth, hydrogen is found in the greatest quantities as water.It is present as a gas in the atmosphere only in tiny amounts â less than 1 part per million by volume. Any hydrogen that does enter the atmosphere quickly escapes the Earthâs gravity into outer space.n Earth, hydrogen is found in the greatest quantities as water. It is present as a gas in the atmosphere only in tiny amounts â less than 1 part per million by volume. Any hydrogen that does enter the atmosphere quickly escapes the Earthâs gravity into outer space.