In an attempt to elucidate the morphologic changes of normal aging skin, the present study was undertaken in human facial and chest well skin of individuals aged from 4 months to 76 years old. Biopsied skin was studied with light microscope, scanning electron microscope, and transmission electron microscope, using both conventional and tannic acid staining. The morphologic changes in the skin were noted as follow: 1. Structurally, the aged epidermis gradually became somewhat thinner, with flattening of the dermoepidermal interface. The number of melanocytes also decreased. 2. Abnormalities of elastic fibers such as loss of oxytalan fibers were observed from age 30. It was the initial sign of the aging process of elastic fibers, followed by abnormal changes in elaunin and mature elastic fibers. The degree of facial skin abnormality was rather more severe than that of the chest wall skin. 3. In individuals more than 50 years old, the age related changes in mature elastic fibers were more severe. Transmission electron microscopically, the electron density in elastin was irregular. The elastic fibers also showed pores and irregular splitting with fragmentation. Fine granular materials were scattered near the elastin. 4. Scanning electron microscopically, the elastic fibers in young adult skin showd ribbon-like fibers aligned in the same direction. They were either cylindrical or elliptical, having smooth surface. In old skin, the elastic fibers ran in various directions, forming complicated networks. These were larger, more elliptical and more branched than those in young adult skin. In summary, histologic changes of aging are much more prominent in sun-exposed skin(facial skin) than in sun protected skin(chest wall skin). A completely different spectrum of elastic fiber abnormalities was found in individuals more than 30 years old. The result indicates that elastic fiber abnormalities are related to aging skin.
Adult ; Male ; Female ; Humans

No abstract available.
Thumb*

No abstract available.
Transplants*

No abstract available.
Facial Nerve*

No abstract available.
Durapatite* ; Dust* ; Rabbits* ; Transplants*

No abstract available.
Acrocephalosyndactylia* ; Hypertelorism* ; Orbit*

OBJECTIVE: Spinal instrumentation without fusion often fails due to biological failure of intervertebral joints (spontaneous fusion, degeneration, etc). The purpose of this study is to investigate the influence of fixation rigidity on viability of intervertebral joints. METHODS: Twenty pigs in growing period were subjected to posterior segmental fixation. Twelve were fixed with a rigid fixation system(RF) while eight were fixed with a flexible unconstrained implant(FF). At the time of the surgery, a scoliosis was created to monitor fixation adequacy. The pigs were subjected to periodic radiological examinations and 12pigs (six in RF, six in FF) were euthanized at 12-18months postoperatively for analysis. RESULTS: The initial scoliotic curve was reduced from 31+/-5degrees to 27+/-8degrees in RF group (p=0.37) and from 19+/-4degrees to 17+/-5degrees in FF group (p=0.21). Although severe disc degeneration and spontaneous fusion of facet joints were observed in RF group, disc heights of FF group were well maintained without major signs of degeneration. CONCLUSION: The viability of the intervertebral joints depends on motion spinal fixation. Systems allowing intervertebral micromotion may preserve the viability of intervertebral discs and the facet joint articular cartilages while maintaining a reasonably stable fixation.
Cartilage, Articular ; Intervertebral Disc ; Intervertebral Disc Degeneration ; Joints* ; Scoliosis ; Swine ; Zygapophyseal Joint

No abstract available.
Neck Dissection* ; Neck*

No abstract available.
Esophagitis*

No abstract available.