Lamellar granule
![Red arrows indicate secreted lamellar granules, and green arrows indicate lamellar granules in the cytoplasm. Scale bar = 200 nm.](/Images/godic/202501/23/Journal.pone.0031641.g0033515.png")
In cell biology, lamellar granules (otherwise known as membrane-coating granules (MCGs), lamellar bodies, keratinosomes or Odland bodies) are secretory organelles found in type II pneumocytes and keratinocytes. They are oblong structures, appearing about 300-400 nm in width and 100-150 nm in length in transmission electron microscopy images. Lamellar granules fuse with the cell membrane and release pulmonary surfactant into the extracellular space.