File:Crowder1957 fig01-07.jpg

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Fig. 1 -7

Figures 1 to 5, drawn to the same scale, X too, illustrate the relative size of the adrenal in horizons xiv to xvii, compared with surrounding structures. Figures 6 and 7 represent the disruption of the cortex by the neural elements in horizon xxiii.

Fig. 1. Earliest evidence of adrenal primordium and change in character of cells in celomic epithelium over adrenal and g0n:I(_lal areas.

Fig. 2. Genital and adrenal ridges are formed, with adrenal groove separating them. The two groups of cells in the medial wall of Bowman's capsule have tlilierentiated preliminary to migration shown in figure 3. Active proliferation in the sympathetic ganglion is beginning.

Fig. 3. Active migration of cells from I:'»owman's capsule. Beginning invasion of primordium by sympathetic neural elements.

Fig. 4. Massive growth of sympathetic elements. So-called “permanent" cortex. Cell types C-I, C-ll, C-III are present in it.

Fig. 5. Height of sympathetic invasion. Cortex pattern is disrupted by sympathetic elements. Rim of cortex is still intact along the celomic border. Cells from Bowman's capsule and celomic epithelium are still being added to the primordium. Islands of cortical cells are scattered among the neural elements.

Fig. 6. Conditions near the caudal pole of the adrenal at the beginning of the second impetus to growth of sympathetic nerve elements. Much of the cortex is displaced. No capsule is yet formed in this area.

Fig. 7. Condition of the gland when proliferation of sympathetic neural elements is most active. The cortical cords are pushed aside to make room for the nerves and chromaflin elements. The retiform pattern of the sympathetic is well illus. trated. I’ o 1%} .2 '3;

Links: fig 1 | fig 2 | fig 3 | fig 4 | fig 5 | fig 6 | fig 7 | fig 1-7 | plate 1 | plate 2 | plate 3 | 1957 Crowder | Adrenal Development


Crowder RE. The development of the adrenal gland in man, with special reference to origin and ultimate location of cell types and evidence in favor of the "cell migration" theory. (1957) Contrib. Embryol., Carnegie Inst. Wash. 36, 193-210.

Cite this page: Hill, M.A. (2024, March 2) Embryology Crowder1957 fig01-07.jpg. Retrieved from

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