. Chordate morphology. Morphology (Animals); Chordata. fibrous dermal layer Figure 8-20. Development of the skin of the lamprey. A, skin of 10- mm larva; B, skin of 90-mm lamprey; C, epidermis and part of dermis of adult. Enamel Enamel can be described in terms of its crystalline structure and low organic content; it does not contain cell spaces. It is also described in terms of its embryological ori- gin, being a product of an ectodermal enamel organ. In dis- cussing the scales of various fishes, there is considerable doubt as to whether the smooth, glassy material on the outer surface of the
. Chordate morphology. Morphology (Animals); Chordata. fibrous dermal layer Figure 8-20. Development of the skin of the lamprey. A, skin of 10- mm larva; B, skin of 90-mm lamprey; C, epidermis and part of dermis of adult. Enamel Enamel can be described in terms of its crystalline structure and low organic content; it does not contain cell spaces. It is also described in terms of its embryological ori- gin, being a product of an ectodermal enamel organ. In dis- cussing the scales of various fishes, there is considerable doubt as to whether the smooth, glassy material on the outer surface of the tubercles is enamel and the interior substance dentine. These hard materials may be only analogous pro- ducts to those of the human tooth. The question whether or not the selachians possess en- amel has been much discussed with divergent conclusions. The enamel-like materials of lower vertebrates agree with dentine in terms of the orientation of their hydroxyapatite crystals, but the birefringence of these materials is as a rule thread cell. slime or mucous bladder cell ^1 germinal epithelium -^basement membrane pigment cell Figure 8-21. Skin of Myxine (After Schreiner). SCALES • 227. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Jollie, Malcolm. New York, Reinhold
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