Camera lucida drawings from sagittal sections through the olfactory limbus and adjacent structures. (A) The drawing accounts for the cellular contents and parceling in the olfactory limbus. Note that glomeruli in the main olfactory bulb (MOB) receive dendrites from mitral cells whose somata lie in the preofactory (PA) and necklace (NGA) areas of the olfactory limbus. A projecting interstitial neuron of the bulbi (arrow) lying deep in the homonymous area (INA) sends a descending axon that forks into rostrally (asterisk) and a caudally (double asterisk) directed branches. Interstitial neuron of the bulbi, interneuron (hollow arrow). (B) Drawing showing the neuronal distribution as seen in a specimen after a two-step strain, Golgi-Cox-Nissl. Arrows, fibrils arising from a necklace glomerulus; PA, NGA, INA, preolfactory, necklace glomeruli, and interstitial areas. Scale bars = 30 μm. Adult rat brain, rapid-Golgi (A), and Golgi-Cox-Nissl (B) techniques.