Fig. 4.

Distribution summary for ABN (top) and vagal ganglia neurons of unknown sensory modality (VGN, bottom) functionally classified as either myelinated A-type or Ah-type or unmyelinated C-type afferent neurons (see Figs. 2 and 3). Female Sprague-Dawley rats consistently showed a much greater propensity for myelinated Ah-type afferent neurons than males. Across the total population of ABN and VGN in females 27% and 33%, respectively, were myelinated afferents, while in males myelinated afferent neurons comprised only about one-fifth of the total population of ABN and VGN.