By Craig Cunningham, Louise Scheuer, Sue Black
I disagree with the various reports which examine this article to White's Human Osteology. whereas there's no doubt that the textual content is informative and the therapy of the topic thorough, Scheuer's textual content lacks adequate illustrations to make it well worth the purchase for useful use in determining fragmented juvenile or child is still. White's textual content offers not less than one picture and outline of every bone, often from each perspective. while Scheuer releases a moment addition, with a ways much less textual content, and extra pictures or illustrations for osteologists who do not need entry to a skeletal choice of juvenile and child bones, then it is going to be definitely worth the purchase.
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Additional info for Developmental Juvenile Osteology
The latter is characterized by synthesis and secretion of cartilaginous proteoglycans and type II collagen. There is the additional matter of small regions of so-called 'secondary cartilage' to be considered. g. the mandible and the clavicle (de Beer, 1937; Koch, 1960; Andersen, 1963). The full significance of this cartilage is not clear but it does serve to emphasize the similarity of development between the mechanisms involved in intramembranous and endochondral ossification (Glenister, 1976).
The embryonic potential to produce certain skeletal structures that will ultimately be suppressed can be retained. For example, snakes retain the mesenchymal condensations that would indicate limb formation. However, they remain small and so may fail to meet the prerequisite cellular quantity threshold so that they ultimately regress. Occasionally some of these suppressed structures do develop beyond the condensation stage and are then classified as atavistic traits (Hall, 1984). Conversely, should a condensation become excessively large, it can subsequently lead to abnormally large skeletal elements (Hall and Miyake, 1992).
In the very early stages, the prechordal plate and cardiogenic area lie in front of the anterior tip of the notochord. The rapid overgrowth of the nervous system produces a head fold during which the buccopharyngeal membrane and pericardium tilt a full 180 ~ ventrally in a process known as reversal. Thus, the future mouth (stomodeum) and pharyngeal region is bounded dorsally by the developing forebrain and notochord and below by the heart tube in its pericardial cavity. In a similar manner, during the formation of the tail fold, the cloacal membrane and connecting stalk, originally posterior, also come to lie ventrally (Fig.