R S Awd Allah1, M A Dkhil, E Farhoud. 1. Department of Anatomy, Faculty of Medicine, Al-Azhar University, Madent Nasr, Cairo 11884, Egypt.
Abstract
INTRODUCTION: An investigation was carried out to determine the morphological characteristics of fibroblasts in two portions of the vocal fold (VF) mucosa, the macula flava (MF) and Reinke's space (RS), of three different age groups: newborns, adults and geriatrics. METHODS: Normal human VF obtained from autopsy cases were included in this study: four from mature newborns; four from middle-aged adults; and four from geriatric cases. Fibroblasts in RS and MF were investigated by transmission electron microscopy. RESULTS: The fibroblasts of the MF in both adults and newborns tended to be stellate in shape, with a small nucleus/cytoplasm (N/C) ratio and a well-developed rough endoplasmic reticulum (rER) and Golgi apparatus (GA). Most of the fibroblasts present in RS were oval in newborns and spindle-shaped in adults, with a large N/C ratio and less developed rER and GA. The majority of fibroblasts of the geriatric MF were stellate in shape; while in geriatric RS, the majority of fibroblasts were spindle-shaped with an N/C ratio of 0.5 to 2.0 as in the case of adults. However, the development of rER and GA was less marked in geriatrics than in adults. CONCLUSION: Histological changes of fibroblasts in the VF mucosa are one of the important causes of the change in voice quality with ageing. Furthermore, geriatric changes in the vocal ligament can be attributed to the activities and the presence of ageing processes in fibroblasts of geriatric VF mucosa.
INTRODUCTION: An investigation was carried out to determine the morphological characteristics of fibroblasts in two portions of the vocal fold (n class="Disease">VF) mucosa, the macula flava (MF) and Reinke's space (RS), of three different age groups: newborns, adults and geriatrics. METHODS:Normal humanVF obtained from autopsy cases were included in this study: four from mature newborns; four from middle-aged adults; and four from geriatric cases. Fibroblasts in RS and MF were investigated by transmission electron microscopy. RESULTS: The fibroblasts of the MF in both adults and newborns tended to be stellate in shape, with a small nucleus/cytoplasm (N/C) ratio and a well-developed rough endoplasmic reticulum (rER) and Golgi apparatus (GA). Most of the fibroblasts present in RS were oval in newborns and spindle-shaped in adults, with a large N/C ratio and less developed rER and GA. The majority of fibroblasts of the geriatric MF were stellate in shape; while in geriatric RS, the majority of fibroblasts were spindle-shaped with an N/C ratio of 0.5 to 2.0 as in the case of adults. However, the development of rER and GA was less marked in geriatrics than in adults. CONCLUSION: Histological changes of fibroblasts in the VF mucosa are one of the important causes of the change in voice quality with ageing. Furthermore, geriatric changes in the vocal ligament can be attributed to the activities and the presence of ageing processes in fibroblasts of geriatric VF mucosa.
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