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Epileptic Disorders

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Might the olfactory bulb be an origin of olfactory auras in focal epilepsy? Volume 18, numéro 4, December 2016

Figure 1

Layers of the olfactory bulb. The 6 layers of the olfactory bulb do not correspond to those of neocortex: (i) unmyelinated axons of primary receptor neurons; (ii) synaptic glomeruli; (iii) tufted neurons and external plexiform layer; (iv) row of mitral cells. (v) internal plexiform layer; (vi) granular cell layer and progenitor cells; Deep white matter origin of olfactory tract and progenitor cell processes.

Figure 2

Olfactory Thalamic Equivalent. (A) Granular and progenitor cells form core of the olfactory bulb. Ventricular recess is within this core (22wk fetus). (B) Calretinin immunoreactivity in peri-glomerular neurons surrounding synaptic glomeruli (g) which are still non-reactive (19wk normal fetus). (C) A nodule of anterior olfactory nucleus within olfactory tract exhibits many synaptic vesicles (5-mo postnatal). Reproduced from Sarnat and Wu, 2016.