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Comparative animal physiology. Physiology, Comparative; Physiology, Comparative. Nervous Systems 829 fibers in the facial nerve are large; in higher vertebrates the visceral sensory centers are reduced, and in birds taste sense
![The chordates. Chordata. Enamel organs. Necks of enamel organs. C D Fig. 36. Diagrams showing the early development of three teeth. (One of the teeth is shown in vertical section.) (Courtesy, The chordates. Chordata. Enamel organs. Necks of enamel organs. C D Fig. 36. Diagrams showing the early development of three teeth. (One of the teeth is shown in vertical section.) (Courtesy,](https://c8.alamy.com/comp/RJ5MPH/the-chordates-chordata-enamel-organs-necks-of-enamel-organs-c-d-fig-36-diagrams-showing-the-early-development-of-three-teeth-one-of-the-teeth-is-shown-in-vertical-section-courtesy-bremer-w-eatherford-quota-text-book-of-histologyquot-philadelphia-the-blakiston-company-odontoblast-dentinal-fiber-tomes-ameloblast-outer-epithelium-process-layer-of-enamel-organ-fig-37-drawing-of-small-segment-of-developing-incisor-from-130-mm-pig-embryo-to-show-formation-of-enamel-and-dentine-x-350-courtesy-patten-quotembryology-of-the-pigquot-philadelphia-the-blakiston-com-RJ5MPH.jpg)
The chordates. Chordata. Enamel organs. Necks of enamel organs. C D Fig. 36. Diagrams showing the early development of three teeth. (One of the teeth is shown in vertical section.) (Courtesy,
![A text-book of dental histology and embryology, including laboratory directions . Two fields of cementum showing penetrating fibers: Gt. granular layer of Tomes;C, cementum not showing fibers; F, penetrating fibers. (About 54 A text-book of dental histology and embryology, including laboratory directions . Two fields of cementum showing penetrating fibers: Gt. granular layer of Tomes;C, cementum not showing fibers; F, penetrating fibers. (About 54](https://c8.alamy.com/comp/2AJ7PT0/a-text-book-of-dental-histology-and-embryology-including-laboratory-directions-two-fields-of-cementum-showing-penetrating-fibers-gt-granular-layer-of-tomesc-cementum-not-showing-fibers-f-penetrating-fibers-about-54-x-xiv-and-in-ground-sections-in-figs-152-and-153-when-thenext-layer-is-formed-if-the-fibers-are-cut-off-the-additionalthickness-of-the-last-layer-is-removed-the-unequal-thick-embedded-fibers-of-peridental-membrane-199-ness-of-the-last-formed-layer-is-not-seen-in-the-layers-beneathit-to-as-great-an-extent-fig-154-record-in-the-calcified-tissue-of-an-absorption-re-2AJ7PT0.jpg)