A text-book of dental histology and embryology, including laboratory directions . The enamel organ, a little older than Fig. 280. It shows the outer tunic, theinner tunic, and the stellate reticulum. The dental papilla in the hollow of thecap. The spaces are caused by shrinkage. its surface. The bone has grown around Meckels cartilageand around the tooth gems on the buccal and lingual,enclosing them in an open groove, which will later be com-pleted and divided into separate crypts for each 285 is from a similar specimen in the region of a tern- 368 THE DEVELOPMENT OF THE TOOTH GERM
A text-book of dental histology and embryology, including laboratory directions . The enamel organ, a little older than Fig. 280. It shows the outer tunic, theinner tunic, and the stellate reticulum. The dental papilla in the hollow of thecap. The spaces are caused by shrinkage. its surface. The bone has grown around Meckels cartilageand around the tooth gems on the buccal and lingual,enclosing them in an open groove, which will later be com-pleted and divided into separate crypts for each 285 is from a similar specimen in the region of a tern- 368 THE DEVELOPMENT OF THE TOOTH GERM porary molar. The dental papilla is taking on the form of acrown and the formation of enamel and dentine is ready tobegin. The cells on the outer layer of the dental papilla Fig. 282. The tooth germ, from the mandible of a sheep. The enamel organ shows theouter tunic, inner tunic, and stellate reticulum. The dental papilla projects intotbe enamel organ. The follicle is attached to the base of the dental papilla andsurrounds the enamel organ. The spicules of bone form the crypt wall. have developed into odontoblasts, forming a single layer ofcolumnar cells lying in contact with the inner tunica of theenamel organ. Here the formation of enamel and dentine BEGINNING OF CALCIFICATION 369 begins, the dentine slightly preceding the enamel. Theodontoblasts form and calcify dentine matrix from withoutinward. The cells of the inner tunic or ameloblasts form
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectteeth, bookyear1912
