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Fig. 2. Developing olfactory and accessory olfactory formations 26 mm fetus

Illustrations to show the position and morphology of the developing olfactory and accessory olfactory formations in the 26 mm. fetus. Erythrosin and toluidin blue preparation.

A, a horizontal section through the forebrain to indicate the plane of the sections and the location of the areas enlarged in B and C. X 3.

B, an enlargement of the region shown within the dotted lines on the left side of figure A, but at a level 80;; inferior to that of A. This drawing illustrates the beginning of lamination in the olfactory formation. X 30.

C, the area enclosed in the dotted lines on the right side of figure A, enlarged to illustrate the beginning of lamination in the accessory olfactory formation. X 30.


Humphrey T. The development of the olfactory and the accessory olfactory formations in human embryos and fetuses. (1940) J. Comp. Neurol. 431-468.

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Cite this page: Hill, M.A. (2024, February 24) Embryology Humphrey1940 fig02.jpg. Retrieved from

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