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Chem. Senses 25: 719-727, 2000
© Oxford University Press 2000

Lack of Functional and Morphological Susceptibility of the Greater Superficial Petrosal Nerve to Developmental Dietary Sodium Restriction

Suzanne I. Sollars and David L. Hill

Department of Psychology, University of Virginia, Charlottesville, VA 22904, USA

Correspondence to be sent to: Dr Suzanne I. Sollars, Department of Psychology, University of Virginia, PO Box 400400, Charlottesville, VA 22904-4400, USA. e-mail: sis2n{at}virginia.edu

Restriction of dietary sodium during gestation has major effects on taste function and anatomy in the offspring. The chorda tympani nerve of offspring that are maintained on sodium-reduced chow throughout life (NaDep) has reduced neurophysiological responses to sodium and altered morphology of its terminal field in the nucleus of the solitary tract. There are many anatomical and physiological similarities between the chorda tympani nerve that innervates taste buds on the anterior tongue and the greater superficial petrosal nerve (GSP) that innervates taste buds on the palate. To determine if the GSP is similarly susceptible to the effects of dietary sodium restriction, the present study examined neurophysiological responses and the terminal field of the GSP in NaDep and control rats. Neurophysiological responses of the GSP to a variety of sodium and non-sodium stimuli did not differ between NaDep and control rats. Furthermore, the volume and shape of the GSP terminal field in the nucleus of the solitary tract did not differ between the groups. Therefore, despite the high degree of functional and anatomical correspondence between the chorda tympani nerve and the GSP, the GSP does not appear to be susceptible to the effects of lifelong dietary sodium restriction.


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