Off-campus UMass Amherst users: To download campus access theses, please use the following link to log into our proxy server with your UMass Amherst user name and password.

Non-UMass Amherst users: Please talk to your librarian about requesting this thesis through interlibrary loan.

Theses that have an embargo placed on them will not be available to anyone until the embargo expires.

Access Type

Open Access

Degree Program


Degree Name

Thesis (M.S.)

Year Degree Awarded



Nerve endings, Senses and sensation, Rat


Horseradish peroxidase (HRP) was applied to the rostral end of sectioned hepatic vagi (HV) . Subsequently, a count of HRP—labeled cells in the nodose ganglia (NDG) yielded an estimate of the minimum number of afferent fibers in the HV of 139. HHP labeled cells were found only in the left NDG and were diffusely spread throughout the ganglia. No HRP labeling was found in areas of the brain previously reported to contain vagal afferent projections. In three cases small numbers of HRP labeled cell bodies were seen in the dorsal motor nucleus (DMN) . The NDG were organized with cell bodies on the sides and their processes and fibers of passage in the center. The NDG have an apparent population of two cell types; large sensory neurons and smaller glial cells. However, the possibility of a population of smaller sensory cells is discussed. An average of total sensory cell counts for three NDG yielded an estimate of 9115 sensory cells.