part of mitral cell layer mitral cell BTO:0001283 BrendaTissueOBO Mitral cells are the principal relay neurons in the olfactory bulb. At the stages 54-56 the main bulb has approximately 1300 of them. Most of them are located in the dorsal part of the bulb. Its dorsal half contains approximately twice as many mitral cells than the ventral half. The external plexiform layer in front of the mitral cell layer can be identified in the dorsal bulb only, while in the ventral bulb the mitral cells are typically located close to and sometimes within the glomerular layer. glomerular layer periglomerular cell