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Dorsal raphe nucleus receives retinal projections of morphologically distinct fibers in the common marmoset (Callithrix jacchus): A subunit B cholera labeling.
J Anat
January 2025
Laboratory of Neurochemical Studies, Department of Physiology and Behavior, Bioscience Center, Federal University of Rio Grande do Norte, Natal, Brazil.
Non-image forming (NIF) pathways, a specialized branch of retinal circuitry, play a crucial role supporting physiological and behavioral processes, including circadian rhythmicity. Among the NIF regions, the dorsal raphe nucleus (DRN), a midbrain serotonergic cluster of neurons, is also devoted to circadian functions. Despite indirectly send photic inputs to circadian centers and modulating their activities, little is known about the organization of retina-DRN circuits in primate species.
View Article and Find Full Text PDFRapid degeneration and neurochemical plasticity of the lateral geniculate nucleus following lesions of the primary visual cortex in marmoset monkeys.
Curr Res Neurobiol
June 2025
Neuroscience Program, Biomedicine Discovery Institute and Department of Physiology, Monash University, Clayton, VIC, 3800, Australia.
Lesions of the primary visual cortex (V1) cause retrograde neuronal degeneration, volume loss and neurochemical changes in the lateral geniculate nucleus (LGN). Here we characterised the timeline of these processes in adult marmoset monkeys, after various recovery times following unilateral V1 lesions. Observations in NeuN-stained sections obtained from animals with short recovery times (2, 3 or 14 days) showed that the volume and neuronal density in the LGN ipsilateral to the lesions were similar to those in the contralateral hemispheres.
View Article and Find Full Text PDFNeural recording chambers for long-term access to brain tissue.
J Neurosci
December 2024
Department of Neuroscience, The University of Texas at Austin, Austin, USA, 78712.
We describe a chamber system to perform imaging, electrophysiology and optogenetic stimulation in awake and anaesthetized marmosets. We developed this low-profile chamber design to be able to access the underlying tissue when needed, or to leave it sealed for long periods. Such accessibility is useful to maintain chamber clarity as well as perform viral or drug injections at different time points.
View Article and Find Full Text PDFOral administration of ethinyl estradiol and the brain-selective estrogen prodrug DHED in a female common marmoset model of menopause: Effects on cognition, thermoregulation, and sleep.
Horm Behav
December 2024
Department of Psychological and Brain Sciences, University of Massachusetts Amherst, Amherst, MA, United States of America.
Menopausal symptoms of sleep disturbances, cognitive deficits, and hot flashes are understudied, in part due to the lack of animal models in which they co-occur. Common marmosets (Callithrix jacchus) are valuable nonhuman primates for studying these symptoms, and we examined changes in cognition (reversal learning), sleep (48 h/wk of sleep recorded by telemetry), and thermoregulation (nose temperature in response to mild external warming) in middle-aged, surgically-induced menopausal marmosets studied at baseline, during 3-week phases of ethinyl estradiol (EE, 4 μg/kg/day, p.o.
View Article and Find Full Text PDFIs the impact of spontaneous movements on early visual cortex species specific?
Trends Neurosci
January 2025
Laboratory of Sensorimotor Research, National Eye Institute, National Institutes of Health, Bethesda, MD, USA. Electronic address:
Recent studies in non-human primates do not find pronounced signals related to the animal's own body movements in the responses of neurons in the visual cortex. This is notable because such pronounced signals have been widely observed in the visual cortex of mice. Here, we discuss factors that may contribute to the differences observed between species, such as state, slow neural drift, eccentricity, and changes in retinal input.
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