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Dorsal root reflexes in kittens
1School of Kinesiology, Simon Fraser University, Burnaby, B.C., Canada.
Insights
Dorsal root reflex (DRR) activity in kittens emerges after birth and matures with age. DRR magnitude increases significantly during the first month, then declines to adult levels.
Area of Science:
- Neuroscience
- Developmental Biology
- Physiology
Background:
- Dorsal root reflexes (DRR) are neural responses originating from peripheral nerve stimulation.
- Understanding the developmental trajectory of DRR is crucial for assessing nervous system maturation.
Purpose of the Study:
- To investigate the ontogeny of dorsal root reflexes in developing kittens.
- To characterize the age-related changes in DRR magnitude and timing.
Main Methods:
- Peripheral nerves of kittens (0.5 to 66 days old) and adult cats were stimulated.
- Dorsal root reflex activity was recorded from dorsal roots.
- Analysis focused on DRR amplitude and duration in relation to age.
Main Results:
- No dorsal root reflex activity was observed in newborn kittens.
- DRR activity emerged around the 4th-5th postnatal day.
- The magnitude of DRR increased progressively with age, peaking at 4 weeks.
- A decline in DRR activity towards adult values was noted during the 5th week.
Conclusions:
- Dorsal root reflex development in kittens follows a distinct pattern, appearing postnatally and maturing over the first month.
- The observed developmental changes in DRR reflect the maturation of spinal cord neural circuits.
- This study provides normative data for DRR development in a feline model.
Abstract:
Dorsal root reflexes, evoked by stimulating the peripheral nerves, were recorded from dorsal roots in kittens in the age range 1/2 day to 66 days and adult cats. No dorsal root reflex (DDR) activity was observed in the newborns. Once it appeared on 4th-5th day, the DRR magnitude (amplitude and duration) increased monotonically with age showing a peak at the end of the 4th week. During the 5th week, the activity declined towards adult values.