Somatosensory nuclei of the manatee brainstem and thalamus. (9/18)

Florida manatees have an extensive, well-developed system of vibrissae distributed over their entire bodies and especially concentrated on the face. Although behavioral and anatomical assessments support the manatee's reliance on somatosensation, a systematic analysis of the manatee thalamus and brainstem areas dedicated to tactile input has never been completed. Using histochemical and histological techniques (including stains for myelin, Nissl, cytochrome oxidase, and acetylcholinesterase), we characterized the relative size, extent, and specializations of somatosensory regions of the brainstem and thalamus. The principal somatosensory regions of the brainstem (trigeminal, cuneate, gracile, and Bischoff's nucleus) and the thalamus (ventroposterior nucleus) were disproportionately large relative to nuclei dedicated to other sensory modalities, providing neuroanatomical evidence that supports the manatee's reliance on somatosensation. In fact, areas of the thalamus related to somatosensation (the ventroposterior and posterior nuclei) and audition (the medial geniculate nucleus) appeared to displace the lateral geniculate nucleus dedicated to the subordinate visual modality. Furthermore, it is noteworthy that, although the manatee cortex contains Rindenkerne (barrel-like cortical nuclei located in layer VI), no corresponding cell clusters were located in the brainstem ("barrelettes") or thalamus ("barreloids").  (+info)

Four-choice sound localization abilities of two Florida manatees, Trichechus manatus latirostris. (10/18)

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Carbon and nitrogen stable isotope turnover rates and diet-tissue discrimination in Florida manatees (Trichechus manatus latirostris). (11/18)

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Novel snake papillomavirus does not cluster with other non-mammalian papillomaviruses. (12/18)

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Ganglion cell distribution and retinal resolution in the Florida manatee, Trichechus manatus latirostris. (13/18)

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Audiogram and auditory critical ratios of two Florida manatees (Trichechus manatus latirostris). (14/18)

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Health assessment and seroepidemiologic survey of potential pathogens in wild Antillean manatees (Trichechus manatus manatus). (15/18)

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Disseminated toxoplasmosis in Antillean manatees Trichechus manatus manatus from Puerto Rico. (16/18)

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