09 17 07 - Teeth

09 17 07 - Teeth - Chapter 7 Teeth Functions of teeth...

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Chapter 7. Teeth Functions of teeth: Useful for piercing and cutting flesh, holding prey or preventing their escape. Also: killing prey, piercing a host (vampire bats!), stripping vegetation, chewing plant or animal matter. Hard to determine phylogenetics by observing teeth evolve too quickly Teeth develop just like scales, and are likely homologous to scales . The four basal groups of gnathostomes (placoderms, chondrichthyans, achanthodians, and osteichthyans) have morphologically diverse teeth. Which is the most primitive is difficult to discern. Made of enamel and dentine I. Generalized tooth anatomy Position: Embedded within the gums = the gingiva Crown – above gum-line Root – below gum-line Components: Cement – surrounds root, sometimes crown; soft acellular bony substance Enamel – outermost surface; acellular Holds tooth in place Dentine – lies beneath enamel, forms bulk of tooth; acellular Pulp cavity – chamber containing blood vessels and nerves II. Development form in ectoderm A. Initiation
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