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A Practical Approach, Second Edition=Ronald D. Ho.pdf

A Practical Approach, Second Edition=Ronald D. Ho.pdf

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246 DEVELOPMENTAL REPRODUCTIVE TOXICOLOGY: A PRACTICAL APPROACH, SECOND EDITIONSternebra ISternebra IISternebra IIISternebra IVSternebra VSternebra VIOssified areas are open, cartilage is shaded.Figure 7.9Sternum of a normal term (GD 20) rat fetus.ribs I to VII are attached to the sternum, and ribs VIII to XI curve upward, with their tips in closeproximity. Ribs XII and XIII are free distally. Extra ribs may also be found on cervical arch VIIand in rats are sometimes found only as cartilage; this extra cartilage is sometimes found to befused to rib I of the same side.Paired dorsal scapulae and ventral clavicles comprise the pectoral girdle (Figure 7.10). Thescapulae are flat, trapezoidal bones with anterior-dorsal projections; the clavicles are elongated,© 2006 by Taylor & Francis Group, LLC

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