File:Macklin-plate02.jpg: Difference between revisions

Plate 2. The skull of a human fetus of 43 millimeters greatest length

By Charles C. Macklin. (5 plates containing 47 figures)

All drawings were made by Mr. James F. Didusch according to geometric projection. With the exception of figure 7, which was made from a profile reconstruction, all figures were drawn from the original plaster-of-paris models made from human fetus No. 886 of the collection of the Carnegie Laboratory of Embryology. The number of the model from which each figure was drawn is given, together with the magnification.

Note - the magnifications refer to the original print versions, not the online images.

Fig. 5. Skull from right side, showing membrane bones. The cervical vertebrae and cartilaginous branchial arch skeleton are included. Only the right half of the skull is shown. Model 1. X6.25.

Fig. 6. Left half of chondrocranium, cervical vertebrae, and cartilaginous branchial arch skeleton as seen from left side. Model 1. X6.25.

Fig. 7. Profiles of external form of head, brain and upper end of spinal cord, and skull, in their normal relation to one another, as seen from the right side. Drawn from a profile reconstruction. Xl-9.

Fig. 8. Condensed mesenchyme enveloping the vomer, seen from front, side, and above. The anterior extremities of the vomer are indicated. The gutter in the center is for the lower edge of the nasal septum. There is a slight amount of lateral curvature. The cut edges of the mesenchyme are indicated. Model 22. X12.5.

Fig. 9. Two halves of the vomer from the same point of view as that of figure 8. They are very slender spicules of bone lying along the lower border of the nasal septum. Model 21. X12.5.

Fig. 10. Median stem of skull as seen from right side. It consists of the basal plate behind and the interorbital and nasal septa in front, forming ai- "btuse angle at the body of the sphenoid. The adjoining exoccipital cartilage is shown in part. Junctions with cartilage lying laterally are shown. Model 4. X12.5.

Fig. 11. Right half of basal plate and parts of upper two cervical vertebrse, sectioned in the mid-sagittal plane. The cut surface is seen in frank view. Shows the preossification center for the basioccipital, the notochord, the pharyngeal bursa with a little of the epithelium of the roof of the pharynx, the temporal wing, dorsum seUae and a portion of the exoccipital. Model 8. X12.5.

Fig. 12. Left cartilage of Jacobson from left side with neighboring septum. Models 2 and 25. Xl2,5.

Fig. 13. CartUages of Jacobson from below in relation to nasal septum. Models 2 and 25. X12.5.

Fig. 14. Right half of occipital cartilage and parietal plate from in front and within, with the ascending process and right half of inter- parietal bone in its mesenchyme. Connections with adjoining cartilages are shown. Model 24. X6.25.