. Chordate morphology. Morphology (Animals); Chordata. ratotrichium with calcified outer layer. cerototrichia Tify'ir:VTT¥V-VV-'^'V'»'»'^.y^'V''i'^v-i(<r»'-T'-y epidermis placoid scale muscle/ \ cerototrichia B POLYPTERUS OR TELEOST lepidotrichium D RAJA LINTEA cartilaginous radial with calcified core Figure 8-46. Frontal section through fins showing interrelationships of ports. (After Jorvik, 1959) interface toward the pulp cavity. These He more or less parallel to each other and act as canals for the protoplas- mic fibers of the odontoblasts. The odontoblasts producing the dentine
. Chordate morphology. Morphology (Animals); Chordata. ratotrichium with calcified outer layer. cerototrichia Tify'ir:VTT¥V-VV-'^'V'»'»'^.y^'V''i'^v-i(<r»'-T'-y epidermis placoid scale muscle/ \ cerototrichia B POLYPTERUS OR TELEOST lepidotrichium D RAJA LINTEA cartilaginous radial with calcified core Figure 8-46. Frontal section through fins showing interrelationships of ports. (After Jorvik, 1959) interface toward the pulp cavity. These He more or less parallel to each other and act as canals for the protoplas- mic fibers of the odontoblasts. The odontoblasts producing the dentine lie on its inner surface, between the dentine and the pulp. The pulp cavity is filled with a gelatinous material in which blood vessels and nerves are found; these e-xtend out through the root of the tooth. This band, called the dental lamina (Figure 8-50), retains its connection with the outer epidermis. The dental lamina has bud-like at intervals called the tooth germs. Each tooth germ produces a cup-shaped enamel organ having an inner and outer epithelium and a pulp-filled in- terior. The enamel organ is attached by a strand to the dental lamina. A mesodermal plug extends up into the ventral Embryological developmenf Tooth development begins with an epidermal invagination along the margin of the jaw. epidermis basement membrane ratotrichium scleroblast actinotrichium. 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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Keywords: ., bookcentury1900, bookcollectionameri, bookcollectionbiodiversity
