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Plate 2

Side View drawings of six stages in the development of the human prenatal and cireumnntnl ossoous skeleton. C71-own-riunp lengths are held constant in all figures.

Note: (1) the maturation of the facial bones, ribs nnd clavicle in the stage depicted in figure 3, (2) maturation of the calvarial bones in the stage depicted by figure 5, (3) the central plate, the open reticular zone and the marginal zone of the calvarial bones, and (4) the relatively slow growth of most of the cartilage bones as exemplified by the supruoeciptal bone and the 1'eln.tive1y rapid growth of the membrane bones as exemplified by the interparietal bone.

CR LENGTH	CH LENGTH	APPROXIMATE AGE
Figure 5	38 mm.		64 days
Figure 6	58 mm.	75 mm.	78 days
Figure 7	88 mm.	125 mm.	3.25 lunar months
Figure 8	105 mm.	156 mm.	3.5 lunar months
Figure 9	139 mm.	205 mm.	4.25 lunar months
Figure 10	330 mm.	479 mm.	10 lunar months

Legend: A., alisphenoid bone; B., basioeoipital bone; Bs., hasisphenoid bone; 0., crown; E., exoccipital bone; I., interparietal bone; Is., ischinm; P., petrosum; Pu., pubis; S., supraoceipital bone; S.M., sternal center of the manubrium; S.P., site of the pertosum; T.A., tympanic annulus.

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