Trigeminal Medullary Dorsal Horn Neurons Activated by Nasal Stimulation Coexpress AMPA, NMDA, and NK1 Receptors

Figure 1

After stimulation of the nasal passages with ammonia vapors, Fos-positive cells were counted bilaterally in the ventral portion of the medullary dorsal horn, between the pyramidal decussation (Bregma-14.60) and obex (Bregma-13.68). Superficial is MDH laminae Iⅈ Deep is MDH laminae III–V; Paratrigeminal neurons are located within spinal trigeminal tract. Cross-sections from Paxinos and Watson [26]. Abbreviations: MDH, medullary dorsal horn; Py, pyramidal tract; Pyx, pyramidal decussation; sp5, spinal trigeminal tract, Sp5I, spinal trigeminal nucleus interpolaris.