Sphingolipids z Sphingomyelin, a ceramide with a phosphocholine or phosphethanolamine head group, is a common constituent of plasma membranes z A cerebroside is a sphingolipid (ceramide) with a monosaccharide such as glucose or galactose as polar head group. H2C H C O CH NH CH C CH2 CH3 H OH ( )12 C R O O O P O H2 C H2 N C + CH3 H3C CH3 Sphingomyelin phosphocholine sphingosine fatty acid − cerebroside with β-galactose head group H2C H C CH NH CH C CH2 CH3 OH C R O OH O H H H H OH OH CH2OH H O H ( )12Sphingolipids z Sphingomyelin, a ceramide with a phosphocholine or phosphethanolamine head group, is a common constituent of plasma membranes z A cerebroside is a sphingolipid (ceramide) with a monosaccharide such as glucose or galactose as polar head group. H2C H C O CH NH CH C CH2 CH3 H OH ( )12 C R O O O P O H2 C H2 N C + CH3 H3C CH3 Sphingomyelin phosphocholine sphingosine fatty acid − cerebroside with β-galactose head group H2C H C CH NH CH C CH2 CH3 OH C R O OH O H H H H OH OH CH2OH H O H ( )12