Functional Histoanatomy of the Human Larynx by Kiminori Sato

Author:Kiminori Sato
Language: eng
Format: epub
Publisher: Springer Singapore, Singapore

14.5 Morphological Comparison Between Cells Including Vocal Fold Stellate Cells in the Maculae Flavae and Fibroblasts in the Lamina Propria of the Human Newborn Vocal Fold Mucosa

Fibroblasts are present throughout the newborn vocal fold mucosa.

As noted above the cells in the newborn maculae flavae are immature and possess some features of mesenchymal cells. The cells in the newborn maculae flavae differ most from fibroblasts in shape, being stellate and possessing cytoplasmic processes. The cells in the newborn maculae flavae possess a few lipid droplets in the cytoplasm, whereas fibroblasts have no lipid droplets. Intracellular organelles are noted in the cells in the newborn maculae flavae, whereas the newborn fibroblasts have a high nucleus-cytoplasm ratio, and fewer intracellular organelles, and thus are inactive and at rest.

A few cells in the newborn maculae flavae show strong cytoplasm staining with periodic acid-Schiff stain and the cells in the human newborn maculae flavae express type III collagen, whereas few components are stained in the cytoplasm of fibroblasts.

The most outstanding features of some cells in the newborn maculae flavae are that they have already started the synthesis of extracellular matrices. The fibroblasts in the lamina propria of the newborn vocal fold mucosa are inactive and produce few extracellular matrices. The cells including vocal fold stellate cells in the newborn maculae flavae have already started the synthesis of extracellular matrices and have some role in the metabolism of extracellular matrices in the newborn vocal fold mucosa.

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