In adults, eczema occurs most frequently on the hands and elbows, and in bending areas such as the inside of the elbows and back of the knees. In young children, eczema is often seen on the elbows, knees, face, neck, and scalp. Signs and symptoms of atopic eczema include: 1  Itchiness. 2  Skin redness.
Sphingolipids are composed of a backbone of sphingosine which is derived itself from glycerol. Sphingosine is N-acetylated by a variety of fatty acids generating a family of molecules referred to as ceramides. Sphingolipids predominate in the myelin sheath of nerve fibers.
In broad brush strokes, what has been learned is that in most mammalian cells, phospholipids account for approximately 60% of total lipids by number and sphingolipids make up another â10%. Non-polar sterol lipids range from 0.1% to 40% depending on cell type and which subcellular compartment is under consideration.