Sphingomyelin

Constitutes a major component of myelin in nerve cell membranes and a significant structural lipid in other cell membranes, being the only phospholipid not derived from glycerol.

Key Functions:

• Essential for the structural integrity and insulation of myelin.
• Involved in membrane fluidity and lipid raft formation.
• Serves as a precursor for ceramide, a signaling molecule.

Interacting Systems & Components:

• Myelin Sheath (major component)
• Cell Membrane (structural component, especially lipid rafts)
• Ceramide (product of hydrolysis)
• Sphingosine (component)
• Sphingomyelinase (enzyme that hydrolyzes it)