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Abstract
Publisher Summary Nucleus olfactorius anterior was identified first in human embryos approximately less than eight weeks of menstrual age (22.2 mm CR). At this time a primordial pars medialis, a pars lateralis, and a pars ventralis are recognizable. By eight and a half weeks, a primordial pars dorsalis has appeared and by nine weeks a true pars dorsalis is in continuity with the cell layer constituting the neopallial cortex. By nine and a half weeks of menstrual age, the olfactory bulbs are elongating and the olfactory crus is sufficiently developed such that the anterior olfactory nucleus is seen completely surrounding the olfactory ventricle in a single section. With the frontal growth of the hemispheres, the olfactory bulbs are compressed. These changes result in decreasing the anteroposterior extent of pars dorsalis as the neopallial cortex extends farther anteriorly at later ages. Early in its development (by eight weeks) some portions of the anterior olfactory nucleus demonstrate differences in the various parts, even though the constituent cells are not enough developed so that Nissl substance is identifiable. These differences are largely due to cellular arrangement, but to a much lesser degree depend on the size of the cell nuclei.
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