The Medulla Oblongata's General Functions. Whereas the pons is located in the upper part of the brainstem, the medulla oblongata is a structure located in the lower half of the brainstem. Just because the medulla oblongata is beneath the pons, doesn't mean it's any less significant. In fact, they often work in tandem on issues such as breathing.
Cirrus are detached clouds in the form of white, delicate filaments or white or mostly white patches or narrow bands. These clouds have a fibrous (hair-like) appearance, or a silky sheen, or both. Cirrus clouds are composed almost exclusively of ice crystals. These crystals are in general very small, a fact, which together with their sparseness, accounts for the semi-transparency of most cirrus clouds.
High-level clouds form 20,000 feet above the ground and include cirrus, cirrostratus and cirrocumulus. These types of clouds are easily recognized by their widespread concentration and wispy, gossamer or lumpy appearance. They are composed of ice crystals. At sunset, these clouds may reflect a variety of colors. Mid-level clouds form 6,500 to 20,000 feet above ground and include altostratus and altocumulus. Their composition depends on height, time of year and temperature, so they can be made of water, ice or both.