. Animal physiology. Physiology, Comparative. Fig. 89.—Devklopment the gum ; h, the lower jaw ; jaw ; d, dental capsules 01' Teeti to the nature of the food on which they have to oj^erate. The manner in which they are is worthy of note. In Man, who may be taken as a fair example, each tooth is developed in the interior of a little mem- angieofthe brauous sac, wliich is lodged in the thickness of the jaw- bone ; as seen in the accompanying figure, wliich represents half the lower jaw of a very young infant, from which the outside has been removed. This sac, which is named the dental cap
. Animal physiology. Physiology, Comparative. Fig. 89.—Devklopment the gum ; h, the lower jaw ; jaw ; d, dental capsules 01' Teeti to the nature of the food on which they have to oj^erate. The manner in which they are is worthy of note. In Man, who may be taken as a fair example, each tooth is developed in the interior of a little mem- angieofthe brauous sac, wliich is lodged in the thickness of the jaw- bone ; as seen in the accompanying figure, wliich represents half the lower jaw of a very young infant, from which the outside has been removed. This sac, which is named the dental capsule («, tig. 90), is composed of two membranes, abundantly furnished with blood-vessels ; and it encloses in its interior a little bud-like protuberance, h, in which ramify a great number of nervous filaments and minute vessels, c. The matter composing this little body, which is termed the j)idp, is gradually converted into the dentine (§ 54) of the tooth, d d which in Man constitutes nearly its whole structure; this conversion takes place first at its highest points, d, d. The crown or ui)pcr portion of the tooth receives a (•overing of enamel (§ 54). Gradually the process of conversion extends more and more to the interior of the pulp ; and at last the whole is changed into dentine, with the exception of a small portion occupying what is termed the cavity of is frequently laid open by decay of its. Fig. 90.—L)KK', Capsi LE. that still the tooth reuuiin> , which external wall. The fang of the tooth, which is the part last formed, receives an envelope of cementum (§ 54), wliich invests it up to the part at which the enamel begins. As the. 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 Carpenter, William Benjamin, 1813-1885. London : H. G. Bohn
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Keywords: ., bookauthorcarpente, bookcentury1800, bookdecade1850, bookyear1859
