Section of submaxillary gland of kitten. Duct semidiagrammatic. (Demilune labeled at center bottom.)
A serous demilune or Crescents of Giannuzzi is a cap in the shape of a half-moon (hence the name "demilune") on some salivary glands.
Serous demilunes are the serous cells at the distal end of mucous tubuloalveolar secretory unit of certain salivary glands. These demilune cells secrete the proteins that contain the enzyme lysozyme, which degrades the cell walls of bacteria. In this way, lysozyme confers antimicrobial activity to mucus.
The serous demilune is an artifact from traditional methods of preparing samples. Samples are traditionally preserved and fixed in formaldehyde. When samples were preserved by quick-freezing in liquid nitrogen and then fixed with osmium tetraoxide in acetone, no demilunes were found. Examination showed that the serous cells and mucosal cells were aligned in the acinus. The traditional preparation caused mucous cells to swell during fixation which results in the serous cells being popped out of their alignment. After sectioning the serous cells resembled the common demilune shape, and were so named.
- Histology image: 13_05 at the University of Oklahoma Health Sciences Center - "Trachea"
- Physiology: 6/6ch4/s6ch4_4 - Essentials of Human Physiology
- Slide at cytochemistry.net
- MedEd at Loyola Histo/HistoImages/hl9-21.jpg