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Age changes in rhesus monkey ciliary muscle: light and electron microscopy
E Lütjen-Drecoll1, E Tamm, P L Kaufman
1Department of Anatomy, University of Erlangen-Nürnberg, Federal Republic of Germany.
Experimental Eye Research
|December 1, 1988
Summary
Age-related changes in rhesus monkey ciliary muscles and nerves parallel presbyopia. Structural alterations in these muscles and nerves suggest a link to age-related vision decline.
Area of Science:
- Ophthalmology
- Neuroscience
- Aging Research
Background:
- The ciliary muscle is crucial for visual accommodation.
- Age-related changes in the eye, such as presbyopia, are common.
- Understanding the structural basis of these changes is important for eye health.
Purpose of the Study:
- To investigate age-related structural changes in the ciliary muscle and intramuscular nerves of rhesus monkeys.
- To correlate these structural changes with functional declines observed in aging.
Main Methods:
- Light and electron microscopy were used to examine ciliary muscle and nerve structures.
- Ages of studied monkeys ranged from fetal to 35-year-old adults.
- Structural alterations were quantified and correlated with age.
Main Results:
- Immature muscle cells and longitudinal fibers were observed in fetuses and neonates.
- By one year, muscle fibers aggregated into bundles with distinct portions (longitudinal, reticular, circular).
- Age-related changes, including lysosomes and myelin figures, appeared by 6 years and increased with age, with degeneration in elderly animals. Pigmented cell increase was also noted.
Conclusions:
- Structural changes in the ciliary muscle and nerves occur progressively with age.
- These neuromuscular alterations parallel the decline in accommodative amplitude (presbyopia).
- The findings suggest a pathophysiological relationship between age-related structural changes and vision impairment.